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Alpha Sentry CAM System User`s Manual 2005

Contents

1. Electrostatic Fields ANSI N42 17B Step 7 3 5000 V No Effect Humidity Range e Sampling Head 0 to 95 relative non condensing e ASM1000 0 to 95 relative non condensing Alarms Status e Filter Door Open e Communication Network Down e Low Flow Rate e High Flow Rate e Detector Voltage e Power 244 Maintenance Specifications e Exposure Acute Chronic e Concentration ASM1000 Standard Audible Selectable 90 or 70 dB 2900 Hz at 60 cm 2 ft Visual Amber trouble and Red exposure 32 3 x 10 lux 3000 end footcandles average Relay contacts are standard SPDT 0 3 A at 30 V ac Trouble and Exposure Sampling Head Optional Model AS020 CAM Sampling Head Alarm one per head Audible Selectable 90 or 84 dB 2900 Hz at 60 cm 2 ft Visual gt 3 watt second xenon flash tube Relay contacts are standard SPDT 0 3 A at 30 V ac Trouble and Exposure Flow Measurement Range 0 24x10 1 42x107 m s 0 5 to 3 0 cfm Recommended Flow Setting 0 47 x 107 m s 1 cfm for 450 mm detector 0 94x 10 m s 2 cfm for 1700 mm detector Meter Type Hot wire anemometer Accuracy 15 ANSI 42 17B Compliance ASM1000 AS450R and AS1700R are fully compliant UL 61010 1 2004 and CAN CSA C22 2 No 61010 1 04 Compliance ASM1000 AS450R and AS1700R are fully compliant ASM1000 Display Size 16 25 cm 6 4 in diagonal
2. 158 New filter cartridges preparing 82 NTB address switch 18 H High background alarm P ASMIQQO ss caia rd 26 Parameters Sampling head sorie crsicesoisi utete is 28 o runerne a ere aan Se 28 History trends gos aa rra de 74 Performance test oc eee ae taal a 89 Host interface A apie stedeewde 93 CHECKSUM csi eel Soe Sad eka pee ae 110 System modifying 93 Command protocol 108 Performance check 89 Communications setup 144 Performance test o 90 Data formats 00 0 000 107 Plutonium Downloading parameters 152 Concentration calculation 167 Field installation 0 0 148 DAC hours calculation 169 Line turnaround ecos oe Se aoa 108 Preparing new filter cartridges 82 Message Protocol 000 106 Printer configuration 98 Response protocols 04 108 Printout typical o 99 Status commands 000 111 System configurati0N o oooooooooo 146 R ReadAccessRange 182 l ReadEnhancedSummaryAlarmStatus 188 ld CAM eses ada aa 28 ReadElOW sos c ea a eae ae eaii 191 Information messages 199 ReadLimitedCalculatedData2 190 Inline manifold installing 227 ReadMenuAccessLength 183 Installing R
3. Viewing System Data Maintenance Data The last three items in the display list are there to let you know when the Sampling Head with the indicated serial number was last serviced For the Filter Change both the date and time of the most recent change are displayed For Efficiency and Air Flow Calibra tion the date they were last performed is displayed Question marks rather than a date are displayed if no calibration has been done Looking At Other Sampling Heads If several sampling heads on your network are simultaneously generating alarms you ll probably want to look at each one s Detailed Display To do that press the DETAILED DISPLAY key again and enter a new sampling head number to view the details of that sampling head The Alarm Log The place to look for information about alarms is the Alarm Log To view the Alarm Log starting from either the Detailed Display we just looked at or the overall Network Display do the following 1 Press the Data Review F3 key 2 In the new row of Status Keys press the Alarm Log F2 key which will display the screen shown in Figure 37 Alarm Log a a A a gt 14Aug 6 10 14 Low Air Flow 14Aug 6 18 14 Low Air Flow 14Aug36 18 14 Low Air Flow Hist Trends Figure 37 The Alarm Log 71 72 System Operation What you re viewing now is a list of the alarms that have been detected by the system with the most recently received alarm at the top of the list For
4. 103 Time setting the 88 Timeout during efficiency calibration 197 Trends history 00 74 Typical printout o 99 Updating the firmware 220 Vacuum connection 19 Viewing Sampling head data 0 72 System datas cisco sede ea oR wee 68 Wall mounting The ASM1000 coincida Hee ees 14 The sampling head 17 253 254 Notes A CANBERRA Canberra we us our warrants to the customer you your that for a period of ninety 90 days from the date of shipment software provided by us in connection with equipment manufactured by us shall operate in accordance with applicable specifications when used with equipment manufactured by us and that the media on which the software is provided shall be free from defects We also warrant that A equipment manufactured by us shall be free from defects in materials and workmanship for a period of one 1 year from the date of shipment of such equipment and B services performed by us in connection with such equipment such as site supervision and installation services relating to the equipment shall be free from defects for a period of one 1 year from the date of performance of such services If defects in materials or workmanship are discovered within the applicable warranty period as set forth above we shall at our option and cost A in the case of defective software
5. 0 2 araa 188 Set Display Flag dc ee bee be he eR RH Sa he OR ee EE Ree eh we 189 Read Limited Calculated Data2 2 2 2 0 0 2 00 00000000000 000 190 Read How s e soa ae woe elke AL oe a eee le ete Ge eee A 191 Read Raw CPM gt esoe tasei ea eee HEE ter g A EH ES a 191 C Maintenance 008 ee eee ee ee ee et ee 193 Calibration os sn iu hha ee eG eRe Oe ee Ee De RS Oe A 193 Sampling Head Energy Calibration 2 2 0 0 0 00000000000 0004 193 Efficiency Calibrations soie a onge avena a a ee ee Ge we we a ls Se eee ae 193 CAM Air Flow Calibration soseo desca a ei a a e aa a i a aii 197 Information and Error Messages etad Gea ai aoe a aa a a e a 198 Information Messages 2 199 Error Messages ive phe a a wD ao es oh ae ew a ke ee cee Mee ah 199 Alarms and Alarm Messages o s ce coc coca ee 201 CAM Fault Octal Values s e sus ek ee A ee ew ee Ee wh ei 202 ASM1000 Fault Octal Valdes oie eee PE eS ee Sa we ee a ee a 203 Alarm Messages o es 6s Ge ee RR Re RR ER ER Oe Ee Hw EE eS 205 Other Alarm Messages modos ios Qe YR Ae OY Pe a a ae ee eg 206 Preventive Maintenances 4 a a ana a ape a Ee ee Ge we a ee e 207 Weekly Maintenance soosi e reda eR ORL es ER EER ERE EEE EG 207 Biannual Preventive Maintenance 208 Annual Preventive Maintenance c rad asg emare aa aia ee 209 Self DiaSnOsucs u y aia eS a eh Ree i Ce ee we 209 Other Diagnostics ovio a Be a ER A ee A Ee we ee es 210 Cleaning P
6. 245 246 Maintenance Type TFT LCD with backlight Resolution 640 x 480 VGA Control Panel 24 pushbuttons Information Displayed e DAC hour Value e Flow Rate e Concentration in user specified units e Alarm Set Point e Alarm Status e Sampling Head ID and Serial Number e Last Calibration Date for the Sampling Head e MCA Spectrum e Time and Date accurate to 1 minute per month e Total volume through filter Historical Data Storage for 30 minute poll time One Sampling Head 24 days Two Sampling Heads 12 days Four Sampling Heads 6 days Eight Sampling Heads 3 days ASM1000 Menu Functions Filter Change Provides automated Filter Change sequence and Time Date stamp Performance Check Provides automated Performance Check sequence and Pass Fail in dication Data Review Historical Trends Alarm Log and Spectral Data System Setup Parameters Check Source Individual Head Control Network Configura tion and Calibration Log In Log Out Allows access to various options according to password level Specifications Sampling Heads AS450 Radial Inlet with 450 mm PIPS AS1700 Radial Inlet with 1700 mm PIPS Alpha Sentry Manager ASM1000 Alpha Sentry Manager Options Model AS020 Alarm Option for Sampling Head Model ASO10 In Line Manifold Option for Sampling Head Model AS031 Filter Cartridges for 450 mm Sampling Heads Package of 25 Model
7. CAM number cycle calculated data command cycle to report calculated data for string format 1 char L last count cycle A last alarm count cycle lt air volume gt lt cr gt lt air flow gt lt cr gt lt CPM gt lt cr gt lt CPM error gt lt cr gt lt unc CPM gt lt cr gt lt unc CPM error gt lt cr gt lt DAC hours gt lt cr gt lt concentration gt lt cr gt lt conc error gt lt cr gt lt critical level gt lt cr gt lt filter time gt lt cr gt lt slope gt lt cr gt lt intercept gt lt cr gt lt checksum gt lt EOT gt volume of air since filter change liters average air flow L min corrected Counts Per Minute CPM corrected CPM uncertainty uncorrected Counts Per Minute CPM uncorrected CPM uncertainty DAC hours DAC hours concentration dpm m concentration uncertainty 119 120 Example critical level filter time slope intercept Command ASM address 05 CAM 2 Host Computer Interface critical detectability level DAC hours time since last filter change hours energy calibration equation slope MeV channel energy calibration equation intercept MeV 05219L lt cr gt lt checksum gt lt EOT gt Command 19 read calculated parameters Cycle L Last count cycle Response 1 0580E 05 lt cr gt 5 7300E 01 lt cr gt 1 5300E 01 lt cr gt 1 4000E 01 lt cr gt 1 7600E 01 lt cr gt 1 1000E 01 lt cr gt 5 3782E 00 lt cr gt 5 4000
8. IN LINE MANIFOLD AIR INTAKE SEAL RING 3 16in x 3 9in DIA O RING 15 6 32x1 4in PAN HEAD SCREWS BAR CLAMP DETAIL VIEW SHOWING O RING POSITION AIR INTAKE BOTTOM LIP Figure 85 Clamping the Air Intake Seal Ring 1 Disconnect power to the sampling head 2 Turn the sampling head upside down on a flat surface The In Line Manifold 3 Use the bar clamp to hold the metal Air Intake Seal Ring in place as you remove the screws refer to Figure 85 A CAUTION Failure to use the clamp while removing screws can result in elongation of the slots in the plastic In Line Manifold This in turn can result in a poor vacuum seal when the unit is reassem bled 4 Start at one end of the split in the metal Air Intake Seal Ring moving the clamp as you go along and remove all of the screws one by one 5 Remove the bar clamp then remove the sampling head top cover 6 Turn the In Line Manifold until the intake pipe is pointing in the desired direction 7 Reassemble the AS010 In Line Manifold starting with Step 7 on page 229 Installing the AS010 In Line Manifold This procedure is to be used for field installation of the AS010 In Line Manifold It also covers removal and realignment of the AS010 In Line Manifold on a sampling head Check your field installation kit to be sure you have all of the necessary parts Use Fig ures 85 86 and 87 to help identify the parts Quantity Description 1 In Line Manifold
9. The alarm is entered into the ASM1000 s Alarm Log Pressing the STOP ALARM button will silence the Audio Output Chronic Release This class also has only one possible cause the ASM1000 has determined that the cumu lative dose measured by a given Sampling Head has exceeded the DAC hr alarm set point provided this point is greater than the detection limit The Factory Default annun ciation for this alarm is The Red indicator on the top of the ASM1000 is illuminated The Fast Audio Alarm is activated at the ASM1000 The Factory Defaults The Exposure Relay Output is activated In the Network Display the CAM Display Box for the Sampling Head which de tected the alarm is changed to reverse video The alarm is entered into the ASM1000 s Alarm Log Pressing the STOP ALARM button will silence the Audio Output Instrument Fault Each Sampling Head continuously measures various internal health parameters These values are sent to the ASM1000 where they are tested to verify that the sampling head is operating properly Problems which are detected are called Instrument Faults If the ASM1000 detects one of the following conditions it will not set the Chronic Re lease alarm Regardless of these conditions however the sampling head can still set its Acute Alarm The Instrument Faults include Low Air Flow High Air Flow CAM Sampling Head Power Failure Detector Bias Supply Power Failure Door Open No Data Acquis
10. where Rg is the ratio of average counts per channel in the plutonium region to the aver age counts per channel in the window from the plutonium region to the 6 05 MeV peak The acute alarm count limit and multiplier can be set via the external setup program with a suitable computer If the limit has not been explicitly set a default threshold of 80 counts and a x1 multiplier will be used If after the limit has been sent to the sampling head the control unit loses power the head will continue to use that new limit If the head also loses its power then has its power re established with the ASM1000 still without power or disconnected the head will continue to use the same limit because the limit and multiplier are stored within the CAM head in non volatile memory When the ASM1000 s power is re established the limit and multiplier presently stored within the ASM1000 will be sent to the CAM heads as soon as the communication link has been opened The Chronic Alarm If the Critical Level in DAC hrs is less than the user selected alarm limit in DAC hrs the chronic alarm is set TRUE if 170 Alarm Logic TA T VES Z pic K Te L gt 0and A gt 25 counts 20 If the Critical Level in DAC hrs is greater than the user selected alarm limit in DAC hrs the chronic alarm is set TRUE if plutonium is detectable That is if A Le gt Oand A gt 25 counts 21 where L is the alarm limit Leis the critical le
11. 28 8 Low Flow cfm High Flow cfm Confidence Level sigma DAC Factor 2 Upper Energy Limit MeW gt Analysis Window MeV Count Cycle min Acute Interval sec Alarms CAM Figure 56 The Alarm Parameters Screen The VERT INDEX key is used to move the reverse video highlight to the parameter which is to be changed The following defines the parameters which may be changed and their allowable ranges 94 Modifying the System s Parameters Alarm Limits Alarm Methods Limit CAM tn Low Flow High Flow Selection for DAC Hrs or concentration method of alarming This is the number of DAC hours for DAC Hr method or DACs for concentration method for CAM n which when exceeded will cause a Chronic Release Alarm to be generated The allowable range is from 0 1 to 99999 This sets the scale range of the Bar Graph presented in both the Network Display and Detailed Display screens The displayed Limit applies only to the associated CAM number A different CAM number can be selected by pressing the CAM button in the menu area at which time a pop up dialog ap pears prompting for the new CAM number Valid entries are 1 through 8 and the selected CAM must be currently connected and on line with ASM1000 After having entered a new CAM number the Alarm Parameters screen is updated to reflect the associated limit value This is the limit for the Low Air Flow Alarm The allowable range is from 0 5 to 9 9
12. 78 Included in the ASM1000 are a series of functions which allow you to manually control the data acquisition of the Sampling Heads While these functions aren t normally used in the day to day operation of the system you ll find them very helpful when you need to take a close look at a suspected problem or examine the data from a low level release The functions are located in the CAM Control menu You can access them from the Net work Display by either e Pressing System Setup F4 e Pressing CAM Control F3 The result will be the display shown in Figure 43 All of the sampling heads connected to your network will be listed and their Status will be shown as Auto to indicate that they are under automatic ASM1000 control and are currently being used for monitoring Controlling a Sampling Head CAM Control Status Table CAM CAM CAM CAM CAM 2 3 4 5 6 7 8 Auto Manual Manual CAM View Start Clear Status Manual Stop Data Table Spectrnm Figure 43 The CAM Control Status Table Selecting the Sampling Head The next step is to select the sampling head you want to manually control Move the re verse video highlight down to the number of the sampling head you want to use via the VERT INDEX key If you skip over the sampling head you want to select keep pressing VERT INDEX until it wraps back to the top of the list and starts down again Automatic vs Manual Control Once the desired sampling head has been selec
13. AS020 ALARM ASSEMBL Y 3 o 3 4 in x TOP FLAT HEAD SCREWS ever DN SPACER IN LINE MANIFOLD QR R254 SSSR IO ISSR KRY ISR KKK SKK 3 16in x 6 9in DIA O RING AIR INTAKE SEAL RING Figure 87 Positioning the In Line Manifold 230 The In Line Manifold 8 Attach the sampling head s top cover to the sampling head using the three 3 supplied 6 32 x 4 flat head screws Torque the screws to 6 inch pounds 0 7 newton meter Don t replace the Alarm yet CAUTION Use a maximum of 6 inch pounds 0 7 newton meter of torque 10 11 12 13 Excessive force can crack the plastic Turn the sampling head upside down on a flat surface and put the larger 3 16 in 5 mm O Ring on the bottom lip of the air intake as shown in the upside down view Figure 226 The metal Air Intake Seal Ring will be used to keep it in place Align the split in the metal Air Intake Seal Ring away from the intake pipe and use the clamp to hold the ring in place as shown in Figure 85 Starting at one side of the split in the metal Air Intake Seal Ring tighten the clamp until two holes in the plastic In Line Manifold align with PEM nuts in the Seal Ring Install one 6 32 x black pan head screw at a time fully into the PEM nuts You must start at one end of the Seal Ring and install one screw at a time without skipping any locations To avoid damaging the holes in the plastic make sure the first sc
14. o ooo 181 SetDisplayFlag command 189 SetMenuAccessLength command 183 SetMenuProtectioncommand 184 Setting A ena ene s ep heer eon 87 THEME roaa n ae Sg ead A 88 Setup Program starting the o o o o o o 32 Software installation o o o ooo 29 Setup commands Read Access Range oocooococcooooo 182 Read Alarm Template 177 Read Enhanced Summary Alarm Status 188 Read FIOW cc dais Bees 191 Read Limited Calculated Data2 190 Read Menu Access Length 183 Read Menu Protection 187 Read Raw CPM oveorssorines osea 191 Read Summary Alarm Status 188 Read Variable sancion 180 Reset Data Available 187 Set Access Range 00 181 Set Alarm Template 0 174 Set Display Flag ecis opeisen ireas 189 Set Menu Access Length 183 Set Menu Protecti0N o oooooooooo 184 Set Variable mociones e ewe 178 SetVariable command 178 Source information 103 Standalone sampling head 21 Starting the setup program 32 Status commands host 111 System data viewing 68 System parameters modifying 93 System performance Checking voca dan 88 TES or o bs 90 System security ci sacca aia ae 55 Tee DORs sga e as we he ra 17 Test source information
15. 04 Note Range checking is done on parameters written to the ASM1000 see Write ASM Setup Parameters on page 123 Write ASM System Parameters on page 125 and Write CAM Setup Parameters on page 125 If a parameter is found to be out of range the error response is sent back with error set to R and param set to the number of the parameter found in error The ASM1000 disregards the entire command when an error is detected Busy Response Protocol The busy response is returned to the Host Computer when the ASM1000 is not able to re spond immediately to the command The ASM1000 could be busy Linearizing updating the display or doing calculations for the end of a count cycle The Summary Alarm Status command Summary Alarm Status on page 111 is handled at the interrupt level and therefore never returns a busy response The ASM1000 will abort the command there fore it is the Host s responsibility to reissue the command at a later time to get the re quested data The ASM1000 can be busy for up to two minutes while Linearizing Syntax lt cr gt lt checksum gt lt EOT gt Parameter l char Busy response start character checksum 2 char Response string checksum Checksum on page 110 EOT 1 char End of Transmission character EOT 04y Checksum The checksum is calculated by performing an 8 bit sum of the string plus the number of characters in the string excluding the two checksum characters and the E
16. 1 2 Introduction 5 24 cewe ee a 8b wee wwe a eee A Theory of O peratOM osa rios ho ad a a ee we 2 Alpha Sentry Operating Philosophy soo 2 The Radon Rejection Screen ase ae oe ae ee ee Da OS ee ed 3 Chronic Release Determination 2 0 ee 5 Acute Release Determination a ee 7 Setting the Transuranic Region o seca ek bee a rra er Ee ee ee 8 Automatic Energy Calibration as aeea ee 10 Installati n SG RS es Pee SHES A System Configuration aisa eoe e a he a as SS oO a ee Re E me ew 12 Configuring the Sampling Head 2 e 12 Wall Mounting the Units s sa i ee icai ee Re le ee BO ol Gad we E 14 Communications e s 6a he ee he coa RR EE HER ORE ee 17 Providing an Air FlOW s s cari a i bow Sane A at a ee d 19 Connection to Alarms ee 19 RS 232 Connections e ss eee cee ee Eee PERE SHE EE ERE RL EE ee ES 20 Standalone Sampling Head Operation ee ee ee 21 Extemal Setup wa 242 20 a AAA EA eee ee ad Eee a DEE 22 The Factory Defaults sc s os oe ae ie Be eG ke eo e es Gow A eee ee a 23 Alarm Annunciation Defaults o ee 23 The ASM1000 Annunciators 2 ee 23 The CAM Sampling Head Annunciators 2 0 0 0000000000074 26 Security System Defaults es as ee ee 28 CAM IDS stan faire a te OA eee OE ee ees Be es 28 Alarm Parameter Defaults s x ce siou roe ee 28 Installing the Setup Software r ea a ioe m daaa aoee e a eo a e a E ea ap e a 29 The SOMWA
17. 1206 2408 JETA 19 2K Figure 63 RS 232 Interface Communication Parameters Config Setup CFrinter gt Baud 1200 2400 96007 19 2K Address Baud 3960053 19 2K Delay Characters 2 Figure 64 RS 485 Interface If you have an RS 485 Interface you must specify a unique address for the ASM1000 on this screen This address is part of all commands and only the ASM1000 with the speci fied address will respond to the command This field is not available for an RS 232C Host Interface since there can be only one ASM1000 145 Host Computer Interface The communication data transfer baud rate is set here For RS 485 9600 and 19 2K baud are the two choices For RS 232C 1200 through 19 2K baud are available The lower baud rates 1200 and 2400 are primarily for use with a slow modem The delay characters are the number of SOH 0x01 characters sent at line turn around time The delay gives the Host computer time to turn around its lines refer to Line Turnaround on page 108 for further information Each character is sent as 8 Data Bits No Parity and 1 Stop Bit System Configuration 146 You can verify which version of the interface you have by looking at the connector type in J103 or by looking at the Communications Parameters Screen see ASM1000 Com munications Setup on page 144 which will show that either the RS 232C or RS 485 Host Interface is available e Ifthe Model ASMO1 RS 485 interface is inst
18. 16 Installation When equipment is permanently connected the end user must supply a switch or circuit breaker in the building installation This disconnect device must be in close proximity to the equipment and within easy reach of the operator This device must be marked as the disconnect device for the equipment in question Figure 10 Line Cord Power Connection Figure 11 Conduit Power Connection Communications 9 Carefully re install the LCD Keyboard then use the six smaller screws to fasten the panel to the chassis making sure that the ground strap on the left side loops under the panel with the screw passing through it 10 Reinstall the top cover using four Phillips head screws through the holes on the sides 11 Reinstall fuse if removed in step 5 Wall Mounting the Sampling Head There is an optional Model AS050 Sampling Head Wall Mounting Bracket available This is to be attached to the wall with user provided fasteners The sampling head s feet are fastened to the bracket s three studs and secured with the supplied nuts The wall fas teners and mounting surface combined must support at minimum four times the weight of the Sampling Head or approximately 8 kg 18 Ib Communications The ASM1000 i
19. 2400 9600 and 19 2 k bits per second are selectable Standalone Sampling Head Operation Standalone Sampling Head Operation The sampling head is configured to be operated with an ASM1000 or as a Standalone air monitor With the ASM1000 the Head is continually polled and the spectrum collected in its integral MCA is periodically transferred to the ASM1000 where a sophisticated al gorithm analyzes the spectrum for possible long term releases of radioactive particles When operated by itself the Head will continually test for Acute Releases as well as monitor itself for instrument faults Default Settings Table 3 shows the Factory Default settings for the sampling head alarms These can be changed with the external setup program see External Setup on page 22 This pro gram loads a new table into the ASM1000 which means that all of the sampling heads connected to an ASM1000 have the same table configuration loaded into their non volatile EEPROM memory If the sampling head is later operated without the ASM1000 the last table that was downloaded from the ASM1000 is used Table 3 Sampling Head Annunciators Default Settings Pst Lamp Horn Exposure Trouble ondition Relay Relay Acute Release X Fast X Chronic Release X Fast X High Background Instrument Fault Slow X Stop Alarm Button X Activated only if the Model ASO20 Alarm Option is installed 21 Installation Several po
20. Parameter Setup sis ie deeb ee bbe ee eee he ede ge a E REG ES 93 Alarm Limits Paramete See sia os a deck Bea ee ad a eh em Se ee a a e 94 Units Parameters 0 aaie oS eae ee RA A Emde eS 97 Communication Parameters s ma sa eka ee 98 Miscellaneous Parameters ee 101 Calibration Due Messages ee 102 Source Information a ewe a a wha ee ew wm GR ews ho Beane ew 103 4 Host Computer Interface 106 Message Protocol sx sers e rs A e A 106 Data Pormats soa 6 bane EERE A a eaa a 107 Line Turnaround e eas ck deh Sed ee ede wha Ghee ole wR Re Oe dee a 108 Command Protocol sissa woe ek Sere de A a ey bed ee Boe co oe he E 108 Response Protocol co so rs ema cedu saaie LE Ee Oe REE RE Eee 108 Normal Response Protocol cos Taa a ds da 109 Error Response Protocol sos a aS er aai a a a a ae aa oe 109 Busy Response Protocol s e seassa sa esias eretge pest rE skas 110 CHECK SUM ars asis ea a ia data Geen e e ce gt erie eS 110 Commands and Responses lt a o caca aaaea eaae a a ae e E A a E e E S A 111 Status Commands 10 3A 11 3B ED 111 Summary Alarm Status 10 e 111 Enhanced Summary Alarm Status BA o e e 112 Detailed CAM Status 11D ossad oss casa e 115 Read Calculated Data Commands 18 3B 19 o ee eee 117 Read Limited Calculated Data A 18 siou 117 Read Limited Calculated
21. Removing these will allow the top cover to be lifted away from the chassis This will expose six Phillips pan head screws that secure the LCD Keyboard to the chassis Remove these screws and carefully lift the LCD Keyboard noting placement of the grounding loop from the keyboard on the left side Rest the LCD Keyboard assembly facing down on the right side of the ASM1000 Be sure to rest the assembly on a soft surface such as cloth to protect the LCD s glass surface Also be sure to keep the assembly as close to the ASM1000 as possible to prevent excessive strain on the interconnecting cables Use a spacer such as a book to lift the LCD Keyboard assembly if necessary The ac fuse on the left side is directly connected to the upper terminal Since the ASM1000 does not have a power switch it s a good idea to remove the fuse until you are sure the AC is wired properly and the ASM1000 has been reassembled The terminal strip on the left of the ASM1000 internal board terminates the line cord as shown in Figure 10 Loosen the screws holding the lugs on the white and black wires removing the nuts holding the green wire and remove the line cord A small plug is provided to fill the hole Attach the wires bringing in facility power as shown in Figure 11 Be sure that the green ground wire is longer than the white or black and attach it under the lower nut of the ground lug Use at least 300 volt 18 gauge wire for these connections 15
22. This command writes the Acute Limit Multiplier to the specified CAM This value is multiplied by the Acute Alarm Minimum Count Limit to establish the minimum number of counts than must be present in the analysis window before a determination to calculate the Acute Alarm is performed by the Sampling Head In previous versions this value was fixed at x1 This parameter is selected through the 578 Alpha Sentry PC Setup Software Params menu Acceptable values range from x1 to x254 19 For Uranium analysis a factor of x10j9 is used Initial default setting is x1 Command lt AAC gt lt C3 gt lt 29 gt lt value gt lt checksum gt lt EOT gt 134 Commands and Responses Size 11 number of digits in lt value gt Parameter AA RS 485 address hex of ASM1000 set to 00 for RS232C C CAM number C3 write Variable opcode 29 identifier code for Acute Limit Multiplier pa rameter lt value gt 1 to 25449 Response lt checksum gt lt EOT gt Size 4 bytes Read Acute Limit Multiplier D3 29 This command reads the current setting for the Acute Limit Multiplier from the specified CAM Command lt AAC gt lt D3 gt lt 29 gt lt checksum gt lt EOT gt Size 11 bytes Parameter AA RS 485 address hex of ASM1000 set to 00 for RS232C C CAM number D3 read Variable opcode 29 identifier code for Acute Limit Multiplier pa rameter Response lt value gt lt checksum gt lt EOT gt Size 15 bytes Parameter lt value gt possible values a
23. alarm alarm type binary format 2 byte appropriate bit 0 no alarm 115 116 Host Computer Interface bit 0 acute release bit 1 chronic release bit 2 low air flow bit 3 high air flow bit 4 sampling head power fail bit 5 detector power fail bit 6 door open bit 7 no data collect bit 8 no spectral data bit 9 sampling head off line bit 10 high background bit 11 energy cal shift exceeded bit 12 peak shift exceeded bit 13 not used bit 14 instrument fault bit 15 not used fault instrument fault number if alarm is an instrument fault binary format 2 bytes fault numbers less than 8000 are ASM faults 0001 invalid start channel for linearization 0002 linearization compensation limit ex ceeded 0003 error building linearization table 0004 insufficient linearization data 0005 hard CAM re initialization 0006 invalid CAM efficiency 0007 invalid filter change date 0008 invalid CAM flow table 0009 invalid energy slope value fault numbers greater than 80004 are the logical OR of CAM faults Commands and Responses bit 0 flow out of limit bit 1 12 V out of limit bit 2 24 V out of limit bit 3 10 V out of limit bit 4 5 V out of limit bit 5 12 V out of limit bit 6 PROM checksum error bit 7 RAM test error bit 8 watchdog timer not programmed bit 9 EEPROM error bit 10 command execution error bit 11 amplifier error bit 12 not used bit 13 not
24. and mL milliliters After you ve made all necessary changes you can return to the Network Display or De tailed Display by pressing either NETWORK DISPLAY or DETAILED DISPLAY To enter one of the other parameter setup screens press the appropriately labeled function key Communication Parameters The variables in this section are used to set the operating parameters for the ASM1000 s standard RS 232C port and optional Host Interface port Setting the parameters follows these rules e The currently selected value is shown inside parentheses e The VERT INDEX key is used to move down the screen from one category to the next e The HORIZ INDEX key is used to move across the choices for any given category e When the highlight is resting upon the selection of choice pressing ENTER will change the value of the current category to the highlighted selection The meaning of the various choices provided in the screen shown in Figure 58 are de fined below 98 Modifying the System s Parameters Communication Parameters Config SLU Printer Baud 1206 24080 9608 19 2K Optional RS 232 Host Interface Port 1200 24080 96005 19 2K Alarm Setup Commun Figure 58 The Communications Parameters Screen Standard RS 232C Port Config Baud The configuration parameter sets the port to operate either as an in put for the ASM1000 s external PC setup or as an output port for a Serial Printer Setup Refer S
25. e Each time a CAM is configured manually added or through network scan e Whenever calibration frequency value is changed by the operator or by the host computer e Each time a new calibration is performed The ASM1000 makes the determination as to whether a calibration due message should be displayed every 12 hours at 12 00 00 and 00 00 00 If another popup window is cur rently on screen such as a Help window it will be removed before displaying the cali bration due message The calibration due message will remain on screen until the operator acknowledges it by pressing the Enter button If enabled the Trouble light will be activated when the calibra tion due message is initially displayed and removed when the message is removed The ASM1000 will remove a calibration due message if a alarm condition develops Source Information This section of the ASM1000 s logic is used to enter information about the Test Source used for the Performance Test and the Efficiency Calibration To reach it from either the Network Display or Detailed Display press System Setup F4 then Source Info F2 The result will be similar to the display in Figure 61 103 Count Time Above Efficiency Below Efficiency Units Activity Energy 104 System Operation Source Information Count Time min Acceptable Performance Check Range Z Above Efficiency 16 8 Z Below Efficiency 168 8 Units utid pti dpm Bq kEq Act
26. includes access range 4 Reset Data Available The ResetDataAvailable command resets the CAM s Data Available flag which is used to notify the host that a CAM s cycle has terminated and new analysis data is available The host may read the CAM s analysis data through the Host Interface s Read Limited Calculated Data or Read Complete Calculated Data commands described in Read Calculated Data Commands on page 117 or the Read Limited Calculated Data2 command described on page 190 can be used to read the analysis data Command lt address gt lt CAM gt lt E1 gt lt checksum gt lt EOT gt 187 Technical Reference Response lt checksum gt lt EOT gt Read Summary Alarm Status The ReadSummaryAlarmStatus command provides a quick alarm status summary of all the CAMs attached to the ASM1000 Command lt address gt lt CAM gt lt 10 gt lt checksum gt lt EOT gt Response lt online status gt lt cr gt lt rad alarm gt lt cr gt lt trouble alarm gt lt cr gt lt data avail gt lt cr gt lt checksum gt lt EOT gt Data is returned as a 8 bit bitmap where bits 0 7 correspond to CAMs 1 8 Parameters lt Online status gt 8 bit bitmap indicating which CAM s are on line and communicat ing with the ASM1000 Bit set 1 indicates CAM is on line lt rad alarm gt 8 bit bitmap indicating which CAM s have detected a radiation alarm chronic or acute Bit set 1 indicates CAM has detected an alarm lt Trou
27. third line showing the range of air flow that this sampling head is to be operated The narrower this range is set the more accurate the measurement because the relationship be tween flow and sensor voltage is non linear A curve is fitted to the measured points For the AS450 we recommend operation at 1 cfm and a range of 0 5 to 1 5 cfm for the AS1700 we recommend Operation at 2 cfm and a range of 1 5 to 2 5 cfm 197 Maintenance CAM 1 Air Flow Calibration Temperature 298 K Altitude a Ft Last Calibration 67r0ct94 14 36 Range LCcfmo gt EW to 2 6 1 48 to 2 66 Figure 76 The Air Flow Calibration Display The ASM1000 requires five Calibration points over the air flow range Suggested limits for five points are displayed The reading of the SCFM meter is entered from the keypad after using the Horiz and Vert Index keys to position the cursor on the appropriate line the sampling head s sensor voltage is displayed on the bottom Status line When the SCFM meter reading is entered and the CAM voltage has stabilized within 0 02 V press the Vertical Index key to accept the first point Repeat this procedure for all five points If you need to make a change to any individual point position the reverse Video cursor in the left column labeled Pt and get to the point to be modified using the Vert Index key Now use the Horiz Index to move to the Meter value Make the necessary change to the meter value or the CAM voltag
28. this and the other possible alarms in detail later on in Handling Alarms on page 62 Alarm LED The Red LED indicator to the left of the Filter Chamber Door will be illuminated when ever an acute or chronic release is detected or if an internal fault condition is detected in the Sampling Head It will stay illuminated until all fault conditions within the Sampling Head have been cleared 45 System Operation Count LED The Green LED directly below the ALARM LED is illuminated whenever the Sampling Head is installed on the network and is actively acquiring data The Green LED also serves as an indicator of the CAM s network status e When the Head is first powered the Green LED will blink until the ASM1000 puts the Head on line AUTO then will change from blinking to continuously on e The Green LED will turn off if the Head goes off line N A If communication is lost between the ASM1000 and the Head the ASM1000 will indicate a fault con dition and the Head will turn the Green LED off after a delay of 10 minutes e In Manual mode where data acquisition is controlled by the operator of the ASM1000 and no exposure alarms are generated the Green LED is turned on when the Head starts counting and turns off when the count stops If communica tion is lost between the ASM1000 and the Head the ASM1000 will indicate a fault condition and the Head will turn the Green LED off after a delay of 10 min utes Note that in addi
29. which may be from 0 0 to 9 99 MeV For example if the Upper Energy Limit is 5 7 MeV and the Analysis Window is 2 7 MeV the portion of the spec trum from 3 0 to 5 7 MeV will be analyzed to determine the DAC hour reading The default is 2 7 MeV which is appropriate for plutonium This is the length in minutes of the MCA counting time The al lowable range is from 5 to 999 minutes The default is 30 minutes The Acute Alarm Count Interval determines the frequency at which the Sampling Head checks for Acute Alarm condition In previous versions this value was fixed at 30 seconds Acceptable values range from 6 seconds to 1530 seconds in increments of 6 seconds After you ve made all necessary changes you can return to the Network Display or De tailed Display by pressing either NETWORK DISPLAY or DETAILED DISPLAY To enter one of the other parameter setup screens press the appropriately labeled func tion key Note that any changes made will not take effect until the end of the current count cycle You can make the changes take effect immediately if you Delete then Add the sampling head see Manual Configuration on page 59 In the deletion process you will have the opportunity to clean up its database if you desire to do so Cleaning up databases that are no longer needed is generally a good idea because it reclaims the storage for use by other CAMs that are presently on line Modifying the System s Parameters Units Para
30. 00 ib ecesseideeny ee enis ee 62 High background calculation of 171 Installing the ASO20 alarm 223 LOSy sa Si elidig tate keh E eE ww tanaws 71 ParaMeters oaeoi epi ds eee eed 28 ReadAlarmTemplate command 177 SetAlarmTemplate command 174 TYPES Of so dsndie So bee base SSeS 65 Annunciators Default settings ecni mes ies era umes 23 Sampling h ad ceo ens hee es ts 26 AS020 alarm Instalhng ani an 223 Reinstalling 106 60 riadas 232 REMOVING wi e ccdea un teca keds aes geu 228 ASM1000 Acute release alarm 0 24 Chronic release alarm 24 Connecting toa PC 0000 0 29 Fault messages 00000 203 High background alarm 26 Instrument fault alarm 25 Operating WIth0UtA ooooooooooo o 21 Wall mountid8 oooooocooccccccnonoo 14 Automatic energy recalibration 159 Background compensation calculation 161 CAM fault messages 202 CAM Jd isc knees Ee Ree eG SS 28 Changing the filter 82 Checking system performance 88 Checksum Host 110 Chronic release alarm ASMID0O y uourosiaasssr daa oe 24 Sampling head ooooococoocoococ oo 27 Command protocol host 108 Communications HOSt Setup ctm ad eetagece oe 144 N tWOrk s aces ees aiii 17 Setting the parameters 30
31. 1 1 8 by 7 in diameter 3 mm by 17 75 cm 1 D O Ring may be mounted in Manifold 1 3 16 by 6 9 in diameter 5 mm by 17 5 cm 1 D O Ring 1 1 in 2 5 cm diameter O Ring may already be mounted in the Manifold s intake pipe 1 Spacer 1 6 in 15 cm Adapter Pipe 1 Metal Air Intake Seal Ring 227 Maintenance 3 6 32 x in Flat head Screws 15 6 32 x Y4 in Black Pan head Screws You ll need the following tools to complete the field installation e A Phillips head torque screwdriver set for 6 inch pounds 0 7 newton meter e A bar clamp or C clamp with a 6 in 15 cm jaw Removing the Model AS020 Alarm If the Model AS020 Alarm Option is installed on your sampling head you ll have to re move it to prevent damage during installation of the ASO10 If the ASO20 Alarm Option is not installed on your sampling head go to AS010 Instal lation Procedure on page 228 1 Disconnect power to the sampling head 2 Remove the three flat head screws holding the top cover on the sampling head These screws will not be reused longer replacement screws are supplied as part of the installation kit 3 Remove the three pan head screws which secure the AS020 Alarm Assembly on the sampling head top cover 4 Firmly grasp the body of the 8 pin connector for the alarm wire harness and disconnect it from the Alarm Assembly printed circuit board Set the Alarm Assembly to one side 5 Slide this connector through the op
32. 2 5 6 Relay Element Trouble No Alarm 0 Q9 Trouble Alarm Trouble Common Exposure Alarm oo Exposure No Alarm Exposure Common Relay contacts rated at 0 3 A 30 V ac shown in power off condition Specifications Specifications Sensitivity Under the following conditions that approximate a laboratory environment 1 pCi L ra don background mostly unattached constant 1 DAC Pu concentration the sensitivity is approximately 2 DAC hours with 1700 mm PIPS 2 5 DAC hours with 450 mm PIPS Under the following conditions that approximate a non laboratory environment 1 pCi L radon background mostly attached constant 1 DAC Pu concentration the sensitivity is approximately 3 5 DAC hours with 1700 mm PIPS 4 DAC hours with 450 mm PIPS Particle Size Deposition Equivalent diameter vs percent penetration shown in Figure 88 Uniform Filter Deposition 9 Coefficient of Variation for 10 um AED particles Efficiency Approximately 33 with a 1700 mm PIPS detector approximately 26 with a 450 mm PIPS detector at a fixed detector to filter spacing of 5 mm Background Reduction Patented screen removes gt 95 of newly formed radon daughter products Detector Type Passivated Implanted Planar Silicon PIPS Size Both 1700 mm and 450 mm are available System Resolution 1700 mm PIPS typically 450 keV 450 mm PIPS Typically 325 keV Filter Cartridge
33. 2877 maximum entries number of data base entries actually returned integer format fc date filter change date for oldest entries date format Commands and Responses fc time ts date ts time info value 1 value 2 value 3 filter change time for oldest entries time for mat the ts date through value 3 block is re peated entries times time stamp date date format time stamp time time format entry info binary format 1 byte bit O not used bit 1 0 cycle entry 1 filter change entry bit 2 not used bit 3 not used bit 4 not used bit 5 not used bit 6 1 chronic alarm bit 7 1 acute alarm cycle Counts Per Minute for cycle CPM filter change efficiency cycle CPM uncertainty filter change no significance cycle volume of air since filter change liters filter change no significance Note The returned data base entries start with the first entry that has a time date stamp that is equal to or older than the requested starting time date The data base entries are returned as oldest to newest A maximum of 50 entries may be requested at one time If more entries are requested number than the data base contains be tween requested time date and newest entry entries will reflect the actual number of entries returned Spectral Data Commands 38 39 These commands read the 256 channels of linearized MCA spectral data If the sampling head specified is in
34. AS032 Filter Cartridges for 1700 mm Sampling Heads Package of 25 Model C2000 X Communications Cable ASM1000 to Multiple Sampling Heads Model C2001 X Communications Power Cable ASM1000 to single Sampling Head consists of C2000 X and C2003 X Model C2002 X Network Access Cable NTB to head Model C2003 X Power Cable ASM1000 to Single Sampling Head Model C2004 ASM1000 PC Setup Cable 1 8 m 6 ft 25 pin to 9 pin Model CA2000 Network Tee Box NTB includes 3 m 10 ft C2002 and CA2001 Model CA2001 Network Terminator NT Model AS047 Filter Paper 47 mm package of 100 Model AS050 Wall Mounting Bracket for Sampling Head Model AS060 Replacement Screen for Sampling Head package of 2 Model ASO70 Power Supply for Sampling Head 115 V ac line Model AS080 4 Am Calibration Check Source for AS450 and AS450R Sampling Heads 247 248 Maintenance Model AS085 4 Am Calibration Check Source for AS1700R Sampling Heads Model ASMO1 RS 485 Host Computer Interface Model ASM02 RS 232 Host Computer Interface Model S578 Alpha Sentry PC Setup Software and cable C2004 Model S579 Alpha Sentry Configuration and Firmware Update Software and cable C2004 Accessories Five filter cartridges supplied with each sampling head One C2001 10 Cable Set and wall mounting kit supplied with each ASM1000 Model AS MAN Alpha Sentry CAM System User s Manual supplied when requested D FCC Notices The followi
35. Already Deleted You are attempting to delete a sampling head that is not on the network Make sure that the cursor is positioned on the correct sampling head you wish to delete and try again CAM not in Manual You are attempting to Start Stop or Clear Data from a sampling head that is not in Manual Mode Press the Auto Manual soft key to put the sampling head into Manual Mode and try again No CAMs Available You are attempting an operation that requires the availability of one or more sampling heads such as Performance Check and there are none available Door Must Be Closed The attempted operation requires that the sampling head door be closed This error is produced when the sampling head is in Manual Mode and an attempt is made to start or stop it with the door open No CAM Database You are attempting to look at a sampling head s database that does not exist Check the sampling head Number and try again Any sampling head in Auto or Manual mode will have a database Previously assigned sampling heads that are now in N A status may still have a database if it was deliberately saved These sampling heads will ap pear as N A DBASE in the Network Configuration Table under System Setup Corrupted Dbase Link DBFLAGS XX Queue Full These three error messages indicate a problem with the existing database Call Can berra s Customer Service immediately Math Error XXXX This indicates a mathematical problem such as dividin
36. Configuration AMtOMAUNC zeae cps eed e aes 58 Manual i ecesai eek east barre ait 59 Configure APUG it atadas 98 The network as sinaua eeuse lena 58 The sampling head o oooooooooom o o 12 Connecting The alarms ceo 19 The sampling pipe 02 224 Controlling a sampling head 78 Count rate calculationof 166 DAC hours calculation of 169 Data formats host 107 Date settingthe 87 Detailed display 68 Efficiency calibration Calculation Ob dara 157 P rfOrming ie 193 Timeout during o ooocoocococoooo 197 Efficiency test performing 90 Enabling the acute test 220 Energy calibration calculation of 157 Energy recalibration automatic 159 Error messages ASM1000 faults arias ri nineta 203 CAM fault ciar pais 202 Other alarms o sec can eheekeles a gece oe 206 Extemalsetip lt oir 4 des ee Be ed 22 251 F M Filter Message protocol Host 106 Changing the smocisai rita 82 Modifying system parameters 93 Changing the cartridges 85 Preparing new cartridges 82 Procedure for changing 84 N Firmware Network Installing 0 ee iw eee ee eave sean 220 Configuring oce 2k eee eee ee eet 58 PA at sted enact Gb Goarasant sets 220 Tes DOK ici ran diia 17 Flow calibration calculation of
37. Data B 3B 118 Read Complete Calculated Data 19 2 o ooo e 118 Setup Parameter Commands 20 25 aaa aaa 121 Read ASM Setup Parameters 20 2 2 ee 121 Read ASM System Parameters 21 o o e 122 Read CAM Setup Parameters 22 o e 122 Write ASM Setup Parameters 23 o o ee 123 Write ASM System Parameters 24 oaaao ee 125 Write CAM Setup Parameters 25 ai 2 ee 125 Stop Alarm Command 28 cs 4 sps aa eae a ae ee 126 Read Data Base Commands 30 32 e 126 R ad Alarm LoS 30 0g re e eae da init a a ae Ewe a 126 Read Trend Data Base Info 31 e 128 Read Trend Data Base Contents 32 o 129 Spectral Data Commands 38D 131 Read Spectral Data 38 o mea ewe ek da eR aS 131 Read Last Alarm Spectral Info 39 0 0 0 2020020000005 eee 133 Acute Alam 29 coxis corra casara haa ee ed Deeb eee ad hens 134 Write Acute Limit Multiplier C3 29 o o 020000000002 e 134 Read Acute Limit Multiplier D3 29 2 0 0 20 02 ee 135 Communication Parameters QA 2B 2C 2D s a ecer te erioa ser ee pRa 136 Write Number of Retries Parameter CBA o aaa a 136 Read Number of Retries Parameter D32A o a 136 Write Retry Wait Parameter C3 2B ce oses tescu tae eair E Toe e 137 Read Retry Wait Parameter D3 2B 2 0 aaa a 137 Wri
38. Relay Relay pelle x Fast X Release Chronic Release i Fasi A High Background Instrument X Slow X Fault Stop Alarm x Button Activated only if the Model AS020 Alarm Option is installed Acute Release This class has only one possible cause the detection of an Acute Release by a CAM Sampling Head It is triggered when the Sampling Head senses a rapid increase in the net count rate counts above background in the spectrum that is being collected For details on the specific algorithm used refer to Appendix A Algorithms The Factory Default annunciation for this alarm is The Factory Defaults e The optional Strobe lamp is illuminated e The optional Fast Audio Alarm is activated e The Exposure Relay Output is activated e Pressing the STOP ALARM button will silence the Audio Output Chronic Release This class also has only one possible cause the ASM1000 has determined that the cumu lative dose measured by a given Sampling Head has exceeded the permissible DAC hr level The Factory Default annunciation for this alarm is e The optional Strobe lamp is illuminated e The optional Fast Audio Alarm Output is activated e The Exposure Relay Output is activated e Pressing the STOP ALARM button will silence the Audio Output Instrument Fault Each Sampling Head continuously measures various internal parameters These values are sent to the ASM1000 where they are tested to verify that the sampling he
39. Should the drift ever exceed the value entered for this parameter an Instrument Fault alarm is triggered to indicate that maintenance is required Factory default value for this setting is 15 Its range is 0 to 255 channels Acute Alarm Minimum Count Limit and Acute Alarm Limit Multiplier The Acute Alarm Minimum Count Limit multiplied by the Acute Alarm Count Limit Multiplier determine the minimum number of counts that must be counted in the TRU region during any Acute Alarm Interval before an Acute Alarm is annunciated The fac tory default value is 80 counts Acceptable range for the Minimum Count Limit is 1 to 255 counts and the Limit Multiplier is x1 to x254 The default Acute Alarm interval pe riod is 30 seconds This is a value that will be applied to all of the sampling heads at tached to a given ASM1000 Establishing the CAM Alarm Parameters When setting this number keep in mind that the Acute Alarm is merely a gross determi nation The default count level of 80 in 30 seconds translates to an activity of 31 DAC hours with air flow of 2 cfm using the detector in an AS1700 Sampling Head For a different flow condition or detector size one must use a different set of minimum count limit and acute alarm interval numbers to achieve the same DAC hour equivalent alarm limit Conversely a different set of numbers may be chosen to achieve a different DAC hour equivalent alarm limit If a Multiplier factor of x1 is used for plutonium
40. The figure shows a Radial Inlet unit without the Alarm Option AS020 If you have the Model ASO20 Alarm Option you may want to disconnect the cable that plugs into the alarm circuit board Refer to Field Installing the Alarm Option on page 223 Disassembly and Reassembly COVER PLATE PREAMP SHIELD PREAMP BOARD DETECTOR SHIELD CAN DETECTOR O RING ALIGNMENT RING SHIELD CAN O RING FILTER CARTRIDGE GUIDE O RING SAMPLE HOLDER PISTON O RING MECHANISM DETAIL FILTER DRAWER MCA BOARD MCA HOUSING Figure 81 Sampling Head Exploded View 217 218 Maintenance Inside the Detector Shield Can is the Preamplifier and Amplifier board Signals to the board come through a 10 pin connector at the top Pull this connector out through the hole in the Preamp Shield To remove the can for cleaning follow these steps 1 Remove the three hex nuts holding the shield and can to the plastic upper air intake assembly A CAUTION The set screws on the top of the Shield Can must not be ad justed or the critical gap between the detector and the filter will be changed Remove the preamp shield If you are only servicing the Preamplifier Amplifier or Detector skip the remaining steps and go to Preamplifier Amplifier and Detector Removal on page 219 Grasp the Detector Shield Can firmly under the lip and carefully slide the Detector Shield Can up from the plastic assembly It is a tight fit so expect som
41. air flow calculation from the specified CAM The flow value is updated every few seconds This command does not reset the CAM s Data Available flag Command lt address gt lt CAM gt lt 3C gt lt checksum gt lt EOT gt Response lt air flow gt lt cr gt lt checksum gt lt EOT gt Parameters lt air flow gt Average air flow in L min This is transmitted in a floating point format Refer to Data Formats on page 107 Read Raw CPM This command returns the raw CPM values from specified CAM The CPM values con sist of three 16 bit quantities representing the CPM for the region below ROI 1 CPM for ROI 1 and CPM for ROI 2 The total CPM as seen by the CAM is obtained by summing the three quantities Command lt AAC gt lt 17 gt lt checksum gt lt EOT gt Parameter lt AA gt RS485address hex of ASM1000 00 for RS232 lt C gt CAM Number 1 through 8 lt 17 gt Raw CPM Command opcode Response lt value 1 gt lt cr gt lt value2 gt lt cr gt lt value3 gt lt cr gt lt checksum gt lt EOT gt Parameter Size 19 bytes lt Valuel gt Value of CPM in region below ROI 1 in hex lt Value2 gt Value of CPM within ROI 1 in hex 191 Technical Reference lt Value3 gt Value of CPM within ROI 2 in hex If the specified CAM does not support the CPM capability the returned quantities for Valuel Value2 and Value3 will be 1 2 and 3 respectively Note The CPM is updated by the CAM head every 30 s
42. assigned to each of the sampling heads in your network as a sampling head identification 1D In this sec tion we ll see how those IDs are assigned The Cam ID dialog Figure 20 is reached through the Cam menu Note While the system will accept CAM IDs of up to 39 characters some of the ASM1000 screens with limited display space will show only the first few charac ters and the Network Display shows only the first seven characters When you re finished press Accept button to send the new settings to the ASM1000 and exit the dialog or press Cancel to exit the dialog and discard any changes 1 2 3 4 5 6 7 8 Cancel Help Figure 20 The CAM ID Dialog 39 Installation Establishing the CAM Alarm Parameters 40 The Alarm Parameters selection under the CAM menu in the setup program is used to es tablish alarm parameters used by the CAM Network The dialog box shown in Figure 21 is displayed when the Alarm Parameters is selected ig CAM Parameters Max Allowable Peak Shift in Channels fi 5 Acute Alarm Minimum Count Lirit eo Acute Alarm Count Lirit Multiplier fl of Consecutive No Counts allowed TTT 1 2 3 4 5 6 7 8 Cancel Help Figure 21 The Alarm Parameters Dialog Max Allowable Peak Shift As part of its built in system integrity testing the Alpha Sentry sampling head monitors any drift that may occur in the 7 68 MeV radon daughter peak in the sampling head spec tra
43. be the logic OR of the following values 00 02 04 08 10 No menu protection for the specified menu lt id gt Set menu protection for lt id gt to access level 1 Set menu protection for lt id gt to access level 2 Set menu protection for lt id gt to access level 3 Set menu protection for lt id gt to access level 4 Multiple ranges can be assigned by summing the appropriate val ues For example to restrict menu access for the specified lt id gt to ranges 2 and 4 the lt range gt parameter must be set to 14 Setup Interface Commands and Responses Read Menu Protection The ReadMenuProtection command returns the current menu protection setting for the specified menu item lt id gt Command lt address gt lt CAM gt lt D2 gt lt id gt lt cr gt lt checksum gt lt EOT gt The CAM in the command is ignored Response lt range gt lt cr gt lt checksum gt lt EOT gt Parameters lt range gt One or two ASCII numeric characters representing the decimal value of the bitmap of the access level ranges that have been as signed to this menu lt id gt The returned value is the sum of any of the following decimal values 0 No menu protection has been set for the specified menu lt id gt 2 Menu protection for lt id gt includes access range 1 4 Menu protection for lt id gt includes access range 2 8 Menu protection for lt id gt includes access range 3 16 Menu protection for lt id gt
44. between the 7 68 MeV and 8 78 MeV peaks which we call the valley point This is point X3 in Figure 3 It is where the contribution from the 7 68 MeV peak ends and there is only a contribution from the 8 78 MeV peak The energy of this point as well as the other two valley points X between the 6 05 MeV and 7 68 MeV peaks and X between the TRU region and the 6 05 MeV peak has been determined ex perimentally Since we automatically energy recalibrate prior to each analysis we are as sured that we have the correct point in the spectrum By definition at the X3 valley point we assume that the counts are only due to the 8 78 MeV peak Therefore we now know the counts in the 8 78 MeV tail region at either end X3 and Xp and can solve for the slope and intercept of the exponential equation that models the tail Using this equation we then calculate the counts due to the 8 78 MeV tail at each point in the spectrum and strip these out We then strip out the Gaussian portion of the peak leaving no contribution from the 8 78 MeV peak in the spectrum This same process is repeated twice more for the 7 68 MeV peak and the 6 05 MeV peak We are now left with only those counts in the spectrum that are due to any transuranic el ements We sum up these counts in the spectrum and determine the CPM concentration and DAC hr values The final step is determining if a chronic release has occurred the calculation algorithm is discussed in The Chronic Ala
45. date format 01 01 80 lt date time system time time format 00 00 00 lt time lt 24 59 59 Response checksum lt EOT gt Size 5 bytes Write CAM Setup Parameters 25 This command writes various sampling head setup parameters Command lt AAC gt lt 25 gt lt no counts gt lt cr gt lt checksum gt lt EOT gt Size 12 bytes Parameter AA RS 485 address hex of ASM1000 RS 232C 00 C CAM number 125 Host Computer Interface 25 write CAM setup parameters command no counts number of no counts alarm limit integer for mat 1 lt no counts lt 256 Response lt cr gt lt checksum gt lt EOT gt Size 5 bytes Stop Alarm Command 28 This command acknowledges an alarm and clears annunciators according to the alarm ta ble present in the ASM1000 This command has the same function as the Stop Alarm button on the ASM1000 monopanel Command lt AAC gt lt 28 gt lt checksum gt lt EOT gt Parameter AA RS 485 address hex of ASM1000 RS 232C 00 C CAM numter 0 not used 28 stop alarm command Response lt cr gt lt checksum gt lt EOT gt Size 5 bytes Read Data Base Commands 30 32 These commands read the contents of the data bases stored in the ASM1000 Read Alarm Log 30 This command reads the contents of the Alarm Log data base Command lt AAC gt lt 30 gt lt checksum gt lt EOT gt Parameter AA RS 485 address hex of ASM1000 RS 232C 00 C CAM numter 0 not used 126 Commands and
46. each entry in the log you ll find the associated CAM Sampling Head Number the date and time when the alarm was detected and a brief description of the alarm condition The Alarm Log can contain as many as 50 entries After the initial 50 alarms have been logged the oldest entry is dropped from the list whenever a new alarm is added to it The only alarms which will be shown are those set to be logged during the initial setup One screen of the Alarm Log can display up to 12 entries To scroll down the list to view the older alarms use the VERT INDEX key To scroll up the list to view the earlier alarms use the HORIZ INDEX key To return to the top of the list press Alarm Log F2 again If an alarm occurs while you re in the alarm log the focus will return to the top of the list Viewing Sampling Head Data For Release Alarms in particular the next step you ll probably want to take is to view the actual sampling head data MCA spectrum that triggered the Alarm For this you use the View Spectrum F3 key at the bottom of the Alarm Log Pressing it will yield the dis play shown in Figure 38 CAM 1 Last Count Cycle Spectrum 100 a4 MATEO a 1 2 3 4 5 7 Hey Timetmin 46 DAC hrs 6 3 Error Auto wuti mL Last Count ae Current cuele Alarm Figure 38 Viewing a Spectrum Selecting the Sampling Head to View By default the ASM1000 will choose the last sampling head whose Detailed Display was examined or i
47. energy in the window defined by the ASM1000 s Alarm Parameters see Modifying the System s Parameters on page 93 For details on preparing the filter cartridges refer to Preparing the New Filter Car tridges on page 82 In addition this test requires that the following have been done before the test is per formed for the first time e The efficiency of each of the sampling heads in the Network must have been cali brated see Efficiency Calibration on page 193 e The parameters to be used for the testing must have been set as described in Source Information on page 103 Preparing the CAM Network for the Test From the Network Display press Perf Check F2 which will change the display to that shown in Figure 54 Performance Check SACADA SADA 1 z 3 4 a 6 7 E CAM Heads primed for Performance Check Source Activity dem 3 57E B004 Count Time min 8 5 Figure 54 Preparing for a Performance Check 89 90 System Operation For each of the sampling heads on the network the Eff column will contain the results from the Efficiency Calibration The word Primed in the Status column tells you that even though the Network is still being used for monitoring the sampling heads are ready for you to begin the Performance Check In addition to the Primed message the LEDs on each of the Sampling Heads will be set to Green On and Red Blinking just as they were for the Filter Change
48. established The five calibration points are then used in a linear least squares procedure to calculate the calibration coefficients a and b in the equation JE a b V 2 where Fs is the reading of the external calibrated flow meter in standard cubic feet per minute and V is the internal flow meter s measured voltage in volts The fitted parameters a and b are then used for subsequent air flow calculations in the equation 158 Spectrum Analysis 2992 T 3 P 298 A F a b V where F is the actual flow in cubic feet per minute Vy s observed voltage reading from the internal flow meter P is the pressure in inches of Hg at the altitude that has been entered at the analy sis unit as the altitude of operation and T is the temperature in degrees Kelvin K C 273 that has been entered at the analysis unit as the temperature of operation The altitude entry is converted to pressure in inches of Hg according to a table shown in Table 11 If the given altitude is not one of the entries in the table a linear interpolation between the nearest higher and lower altitudes is used to establish the pressure Spectrum Analysis Spectrum analysis includes Automatic Energy Recalibration Background Compensation and calculation of plutonium concentration and exposure This is performed e At the end of a count cycle e After a sampling head reports an Acute Release e When first entering Filter Change Perf
49. gt field EOT End of command character 04h Normal Response Syntax lt data gt lt cr gt lt checksum gt lt EOT gt A valid response sequence always begins with a character 2Ah and ends with a EOT character 04h In addition Normal response start character 2Ah data This field is command specific It shall consist of a number of ASCII characters from 0 to 245 maximum representing the data returned by the command checksum Consists of two ASCII alphanumeric characters representing the 8 bit sum of all the characters in the command string excluding the two checksum characters and the EOT character plus the actual length of the string from the response start character to the re sponse stop character EOT End of response character 04h Error Response Syntax lt error gt lt cr gt lt param gt lt cr gt lt checksum gt lt EOT gt Error response start character 3Fh error Single ASCII character defined as follows 173 Technical Reference E bad command etc C checksum error R parameter range error includes optional lt param gt lt cr gt field H Specified CAM not available T Invalid parameter param Optional field consisting of a single 8 bit binary value that is asso ciated with R error The returned value shall be within the 00h through FFh range representing the parameter number that caused the R error The checksum and EOT fields are identical to those i
50. gt lt value gt lt cr gt lt checksum gt lt EOT gt Note There is no lt cr gt separator between the lt id gt and lt value gt fields Parameters lt id gt Two ASCII alphanumeric characters representing the hex value of the variable identifier whose value is being set The id s are as fol lows 04 High Flow alarm limit in cfm Range 0 001 9 999 05 Low Flow alarm limit in cfm Range 0 001 9 999 06 Confidence Level sigma Range 0 00 3 27 07 Analysis Window width in MeV Range 0 001 9 999 08 Upper Energy Limit in MeV Range 0 001 9 999 09 Altitude in ft range must be within 0 65535 OC CAM s ID string up to 39 characters 14 Calibration Source Upper efficiency limit in 10 range 1 1000 15 Calibration Source Lower efficiency limit in 10 range 1 1000 16 Calibration Source Activity in dpm Range 1 65535 17 Calibration Source Count Time in minutes Range 1 999 Setup Interface Commands and Responses 18 Analysis DAC Factor read only 19 LCD Backlight Timeout in minutes Range 0 255 1A Normal cycle time in minutes Range 1 999 1B Login Timeout in minutes Range 0 255 1C Maximum allowable channel shift in channels Range 1 255 1F Value of CAM s No Data counter Range 1 255 20 Value of flow hysteresis in 10 Range 0 to 255 for 0 0 through 25 5 21 ECAL Slope Range 0 000 through 9 999 22 ECAL Intercept Range 0 000 through 9 999 23 CAM s Serial Number read only
51. hr is reported in place of critical level The parameters are read on a per sampling head basis Unless otherwise stated each parameter is for the last count cycle Command lt AAC gt lt 3B gt lt checksum gt lt EOT gt Parameter AA RS 485 address hex of ASM1000 RS 232C 00 C CAM number 3B limited calculated data command Response lt air flow gt lt cr gt lt concentration gt lt cr gt lt dac hr gt lt cr gt lt checksum lt cr gt Size 40 bytes Parameter air flow instantaneous air flow L min concentration concentration dpm m dac hr DAC hours Note Reading these calculated parameters will cause the New Data Available status bit to be reset for the appropriate sampling head see Summary Alarm Status Com mand on page 111 Read Complete Calculated Data 19 This command reads the various parameters that are calculated at the end of each count cycle These parameters are on a per sampling head basis Unless otherwise stated each parameter is for the last count cycle or the last alarm count cycle depending on which is asked for with the cycle parameter of the command Command lt AAC gt lt 19 gt lt cycle gt lt cr gt lt checksum gt lt EOT gt 118 Commands and Responses Parameter Response Size Parameter AA 19 cycle 160 bytes air volume air flow CPM CPM error unc CPM unc CPM error DAC hours concentration conc error RS 485 address hex of ASM1000 RS 232C 00
52. is blank so that you can fill in your own setup Sampling Head Annunciator Settings The factory defaults for the Sampling Head annunciators are shown in Table 9 Table 10 1s blank so that you can fill in your own setup 62 Handling Alarms Table 7 Factory ASM1000 Annunciators Alarm Condition Red Lamp Amber Lamp Horn Exposure Relay Trouble Relay Screen Alarm Log Entry Acute Release Fast X X Chronic Release Fast High Background Instrument Fault Slow Stop Alarm Button N A Table 8 Your ASM1000 Annunciators Alarm Condition Red Lamp Amber Lamp Horn Exposure Relay Trouble Relay Screen Alarm Log Entry Acute Release Chronic Release High Background Instrument Fault Stop Alarm Button 63 64 Table 9 Factory Sampling Head Annunciators System Operation Alarm Conditions Strobe Optional Horn Optional Exposure Relay Trouble Relay Acute Release X Fast X Chronic Release Fast High Background Instrument Fault Slow Stop Alarm Button Table 10 Your Sampling Head Annunciators Alarm Conditions Strobe Optional Horn Optional Exposure Relay Trouble Relay Acute Release Chronic Rele
53. not an acute condition It must be kept in mind that this is a gross determination If there is in fact an acute re lease there will be far more than 80 counts in the TRU region and the ratio of TRU to background counts would far exceed two The regions are continuously adjusted based on the automatic energy recalibration de scribed on page 10 This continuous recalibration ensures that the correct region is used in spite of any peak shifts that will occur due to attenuation from filter loading over time Introduction Since the determination of an Acute Release is the most important function of an Alpha Sampling Head we have taken steps to ensure that even 1f the ASM1000 is off line for any reason the Sampling Head can still determine an acute release and annunciate its alarms There are default regions that are programmed in the Head which are used in the absence of the ASM1000 Setting the Transuranic Region The transuranic or analysis region is set by the user through the ASM1000 Operator In terface It is important to realize that this is not a Region of Interest ROD which is nor mally meant to define a peak area It is simply a broad region which encompasses the peak of interest but is not necessarily defined by it In the ASM1000 these limits are defined as the Upper Energy Cutoff and the Analysis Window The Upper Energy Cutoff is the right hand limit of the region and is specified in MeV It should be set slig
54. of the ASM1000 s controls and indicators we ll take a closer look at the use of the numeric keypad The number keys and decimal point all operate just as you would expect as far as enter ing numeric values are concerned For the other keys the following general operating conventions apply Vert Index The VERT INDEX key scrolls from the top of a list to its bottom It also moves from the last entry in a column to the first one Horiz Index The HORIZ INDEX key moves through the entries from left to right It also moves from the last entry in a line to the first one Cancel Press CANCEL to abort the entry of a new value or parameter and retain the original value For example assume the High Air Flow Alarm Limit is currently 3 0 cfm and the parameter is selected for editing If you press 2 5 on the keypad the value 2 5 will replace the original 3 0 on the display But if you change your mind and press CANCEL next the 2 5 will be deleted and the original value of 3 0 will reappear Enter Press ENTER to accept the new value and store it in memory In the above example pressing ENTER rather than CANCEL would cause the original 3 0 cfm value to be replaced with the new 2 5 cfm flow rate Note that in addition to the ENTER key you can press either HORIZ INDEX or VERT INDEX to accept the new value Clear Pressing CLEAR while typing in a new value will erase the new value so you can correct a data entry error In addition shou
55. refer to Installing the ASO10 In Line Manifold on page 227 for installation instructions Sampling Pipe Connection This section tells you how to connect the In Line Manifold s Intake Pipe to your sam pling pipe It is important to follow these directions exactly to be sure that an air tight seal is made between the sampling head and your pipe 1 Use the 6 in 15 cm adapter pipe provided with the ASO10 In Line Manifold to insure a good seal 2 Verify that the 1 in 2 5 cm O Ring is inside the In Line Manifold s intake pipe and seated on the shoulder inside the pipe see Figure 85 3 To make the seal air tight hand tighten the plastic nut over the adapter pipe while holding the sampling pipe in a fixed position The seal is made by compressing the O Ring with the flat end of the adapter pipe 4 Connect your pipe to the other end of the adapter pipe A CAUTION Over tightening the nut or turning the adapter pipe will deform the O Ring which will cause leaks 224 The In Line Manifold The adapter pipe is threaded to 1 in NPT standard and can be joined to your sampling pipe using a threaded coupling a union or a hose with a clamp Repositioning the Intake Pipe If you want to rotate the Manifold so that the intake pipe is in a different position you Il need e A Phillips head torque screwdriver set for 6 inch pounds 0 7 newton meter e A bar clamp or C clamp with a 6 in jaw If the Model ASO20 Alar
56. sampling head efficiency which it needs to calculate the end of count cycle results Preventive Maintenance The following is a recommended preventive maintenance schedule for the Alpha Sentry Continuous Air Monitor Note that Conditions vary from site to site and this recommended schedule may not be appropriate for your facility Canberra strongly recommends that you closely monitor the system over the first year and make any adjustments to the schedule that are warranted by your facility s individual conditions Weekly Maintenance Three maintenance routines should be performed every week Replacing the filter check ing the unit s performance and inspecting the radon rejection screen for dust buildup 207 Maintenance Filter Change Replace the filter cartridge with a new cartridge that has a freshly loaded filter Low air flow or an Ecal Shift error may be an indication that the filter needs to be changed more often Performance Check To verify the efficiency calibration use an Am source Canberra Model AS080 for 450 PIPS or AS085 for 1700 PIPS or equivalent is recommended and count for at least one minute If the Acute Test is enabled Checking System Performance on page 88 the source must have its peak in the windows defined by the Alarm Parameters Alarm Limits Parameters on page 94 Verify that the efficiency is within 10 of the calibrated efficiency Radon Rejection Screen Verify that the rad
57. sampling head is still being used for its normal alarm counting Green On the Door Alarm has been disabled to al low you to change the filter If a release condition is detected on any Head while in the Primed state the Filter Change function will be aborted The Network Display and the appropriate annunciator will be activated Changing the Filter Cartridges If the filter is being changed after a release condition has been detected the CAM and ASM annunciators will be reset Once the Sampling Heads have been primed for the change the following procedure is used to replace the filter cartridge in each of the sampling heads 1 After verifying that the sampling head s Red LED is blinking open the Head s door by turning the latch counterclockwise from CLOSE to OPEN and pulling it outward 2 Remove the old cartridge shown in Figure 51 by lifting it out of the holder 3 Place the new cartridge in the holder insuring that the notch on the underside of the cartridge is meshed with the orientation dimple in the filter holder 85 System Operation Figure 51 The Filter Cartridge in its Holder 4 Close the door and latch it by turning the knob clockwise from OPEN to CLOSE When you do that e The Red LED will stop blinking and remain off to let you know that the filter change has been sensed by the sampling head s logic e The Last Change entry in the Filter Change Record for that sampling head will be updated to t
58. standard communication medium is used This screen is ac cessed through System Setup Calib Diag Test Comm Stat The Communication Statistic screen Figure 79 displays the total number of retries timeout between each retry and for each CAM the ratio of retries commands as a per centage shown in the errors column Ideally the retries and the ratios should be at zero 211 Maintenance Communication Statistics Retries Timeout CAH Errors Serial HMumber ALA ALA ALA AA ALA HA HA HA 0 a OM DA Figure 79 The Communications Statistics Screen Communication parameters can be modified through the AsmASPC Setup Utility s Cam menu when activated displays the CAM Communication Parameters shown in Figure 80 w CAM Communication Parameters Number of Retriez 1 255 5 Time between Fetes sec Time between Commands msec Post Command Delay msec Accept Cancel Help Figure 80 S578 Alpha Sentry PC Setup Software CAM Communication Parameters 212 Cleaning Procedures Each field has the appropriate description in the help file The communication rate be tween the ASM1000 PC Sampling Heads is always 19 2 Kbaud When using RF Modems or other non standard medium the Time between Commands and Post Command Delay parameters must be selected until the number of retries in the Communication Statistics screens are minimized With current ASM1000 hardware the Time between Retries parameter should not
59. the process of Linearizing or the ASM1000 is in the process of its calculations at the end of a count cycle a Busy response page 110 will be returned to the Host Read Spectral Data 38 This command reads the 256 channels of spectral data for the count cycle specified 131 Host Computer Interface Command lt AAC gt lt 38 gt lt cycle gt lt cr gt lt checksum gt lt EOT gt Size 11 bytes Parameter AA RS 485 address hex of ASM1000 RS 232C 00 C CAM number 38 spectral data command cycle cycle for which to report spectral data string format 1 char C current count cycle L last count cycle A last alarm count cycle if any other character is used here the previ ously requested spectrum will be transmitted Response lt data 0 gt lt cr gt lt data 1 gt lt cr gt lt data 255 gt lt cr gt lt checksum gt lt EOT gt Size 2820 bytes maximum Parameter data 0 elapsed time in seconds integer format data 1 channel 1 data integer format data 255 channel 255 data integer format Example Command 1C138C lt cr gt lt checksum gt lt EOT gt ASM address 1C CAM 1 Command 38 read spectral data C Current cycle 132 Commands and Responses Response 1800 lt cr gt O lt cr gt 3 lt cr gt 5 lt cr gt 150 lt cr gt 213 lt cr gt lt checksum gt lt EOT gt channel 0 1800 seconds channel 0 counts channel 2 3 counts channel 3 5 counts channel 254 150 coun
60. used bit 14 not used bit 15 CAM fault Read Calculated Data Commands 18 3B 19 These commands read the various parameters that are calculated at the end of each count cycle These parameters are on a per sampling head basis There is both a limited com mand which provides a quick response and a complete command which returns all calcu lated data Read Limited Calculated Data A 18 This command reads a limited set of parameters that is calculated at the end of each count cycle They are read on a per sampling head basis Unless otherwise stated each parame ter is for the last count cycle Command lt AAC gt lt 18 gt lt checksum gt lt EOT gt Parameter AA RS 485 address hex of ASM1000 RS 232C 00 C CAM number 18 limited calculated data command Response lt air flow gt lt cr gt lt concentration gt lt cr gt lt critical level gt lt cr gt lt checksum gt lt EOT gt Size 40 bytes Parameter air flow instantaneous air flow L min concentration concentration dpm m 117 Host Computer Interface critical level critical detectability level DAC hours Note Reading these calculated parameters will cause the New Data Available status bit to be reset for the appropriate sampling head Summary Alarm Status Command on page 111 Read Limited Calculated Data B 3B This command reads a limited set of parameters that is calculated at the end of each count cycle It is similar to command 18 except that DAC
61. y a 51 The Network Display 4 0e 4054 e i a a ee a a 52 Log In and Log Out sis w dine ra we Beal i aa e oe a E da 54 The Access COdE e s ce eee cage kad eee k E e e e ESR HERE RR OE ES 54 System Security se 6 4004 do a we eS A A 55 Changing the Access Codes 4 20444 e 20484 aE Sada ER eee Da ee eh ed oe 56 ogee IM 2 seas delete RG A Be De ye ee aa A Se 56 LOgeme Out s s ero we A Ee SE a OPE OEE ee eo 57 Configuring the System Network 1 2 0 0 0 0000002 eee ees 58 Automatic Configuration s sos sosca kaca e e ee 58 Manual Configuration 59 Deleting Sampling Heads ee 59 Adding Sampling Heads ee 61 Using the New Configuration 0 0 00 nikak paie ee ee 62 Handling Alarms s 2458 6 Se oR RR DER ER ERLE RR YD Oe RE Hee d 62 Types Ot Alarms cc 98 ee be OE eA a ee a o ee el A 65 Acute Release 244550545 e dalek ae od MER ee ER oe eee 65 Chronic Releas socorrer rra RE SRE RR ERED SHEE EL SEH RS 66 High Background oree poe By ee EG a a Ai 66 Instrument Bault 4 2 Seiad rar eRe A ae AR we 67 Acknowledging Alarms o o ee ee 68 Viewing System Data s e r adii a e e a ai a ee ee ee ee a e A 68 The Detailed Display se o ccc cacca 2 armare pk ne a ERE e a A Ea wD a 68 The Alarmi LOS ess ay Gb a aot a we Got eet eek ow we By ed ae be rn le 71 Viewing Sampling Head Data gt co ssc 2 eiaeaen ad d erada nea 72 Selecting the Sampling Head to View 0 2 000 0000 000004 72 Looki
62. you ll need to manually configure your CAM Network In this section we ll see how that s done Deleting Sampling Heads Taking a sampling head temporarily off of the CAM network is called deleting a sam pling head and it s done as follows 1 From the Network Display press System Setup F4 then Network Config F4 as in steps 1 and 2 above 2 Press VERT INDEX as many times as necessary to move the highlight down to the number of the sampling head that is to be deleted For example in Figure 33 the highlight is on CAM 1 Hetwork Configuration CAM 1 ID z 3 4 a 6 7 E Figure 33 CAM 1 Has Been Selected for Deletion Note If you move the highlight beyond the sampling head you want to delete continue pressing VERT INDEX until the highlight wraps back to the top of the list and moves down to the sampling head you want to select 59 System Operation 3 Press Delete CAM F3 which will bring up a message asking if you really want to delete the database The Status of the sampling head will change from Auto to N A or N A Database and the Green Count LED on the CAM will be turned off This removes the sampling head from the network which causes the ASM1000 to stop communicating with the sampling head and to ignore all alarms and messages the sampling head may send As you can see in Figure 34 CAM 1 is no longer available N A Hetwork Configuration Status CAM 1 ID z2 3 4
63. 000 will terminate the Effi ciency Calibration and will place all of the sampling heads back on line If the source has not been removed the Head will not go back on line until a door open ing has been detected CAM Air Flow Calibration For proper analysis of the spectrum collected from the particles sampled on the sampling head s filter the ASM1000 totalizes the volume of air being drawn through the filter A mass flow sensor in each Sampling Head is read out periodically The sensor output is factory calibrated for the range of air flow expected The calibration is stored in non volatile memory in the Head A graphic readout of the current air flow is part of the Network Display A numerical readout is part of the Detailed Display If it is necessary to recalibrate a reference meter that measures SCFM is required along with some way to change the air flow A cartridge with a clean filter should be in place The air flow menu is under the CALIB function If you have several sampling heads connected to the ASM1000 you must first go to ei ther the Detailed Display or the Network Configuration Table to select the Head to be calibrated As shown in Figure 76 the first line of the Air Flow Calibration menu shows the Tem perature and Altitude constants that were entered during installation The volume of air is directly related to these parameters The date of this Head s last air flow calibration is shown on the second line with the
64. 1000 and wait 30 secs before repeating Poonehroniaing with ASM1000 Try 985 come 115 2kb 7 21 2005 3 07 50 PM Figure 83 AsmLoad Firmware Update Utility 221 Maintenance Press the browse button button then navigate to the drive containing the firmware file select DRU EXE and press the Open button to accept The Program Options control group gives you the ability to reconfigure the optional host interface on J103 and to enable disable the Acute Test during the Performance Check procedure To leave these options unchanged click on the No Change button To modify these options you can select the desired mode now by clicking on the appropriate controls or refer to the Downloading Interface Parameters on page 152 for a guided procedure The configuration utility will continuously attempt to synchronize with the ASM1000 A message will be displayed on its status bar with each attempt If not already synchronized cycle power to the ASM1000 The startup process in the ASM1000 will invoke the corresponding download utility in the device and synchronize with the computer When synchronization between the computer and ASM1000 has been established the status bar will indicate Synchronized Next press the Start button to transfer the selected file to the ASM1000 and update the selected program options The progress bar will indicate progress level Once the down load is complete and successful the following me
65. 1000 which determines the amount of time to wait between retries on a communication failure between the ASM1000 and CAM Acceptable limits are 0 through 65535 9 Each unit is approxi mately 1 18 seconds Initial default setting is 5410 for approximately 2 8 seconds Command lt AAC gt lt C3 gt lt 2B gt lt value gt lt checksum gt lt EOT gt Size 11 number of digits in lt value gt Parameter AA RS 485 address hex of ASM1000 set to 00 for RS232C E CAM number C3 write Variable opcode 2B identifier code for Retry Wait parameter lt value gt 0 to 6553519 Response lt checksum gt lt EOT gt Size 4 bytes Read Retry Wait Parameter D3 2B This command reads the current setting for the Retry Wait parameter Command lt AAC gt lt D3 gt lt 2B gt lt checksum gt lt EOT gt 137 Host Computer Interface Size 11 bytes Parameter AA RS 485 address hex of ASM1000 set to 00 for RS232C C CAM number D3 read Variable opcode 2B identifier code for Retry Wait parameter Response lt value gt lt checksum gt lt EOT gt Size 15 bytes Parameter lt value gt possible values are 0 to 65533 0 Write Post Command Delay Parameter C3 2C This command sets the Post Command Delay value in the ASM1000 which determines the amount of time to wait after sending a end of command character to the CAM and re turn the RS485 lines to listen mode Acceptable limits are 0 through 32767 19 Each unit represents approximately 500 micros
66. 13 35 Checking System Performance 88 This procedure combines a test of the Sampling Head s performance and a filter change into a single operation It is usually performed on weekly basis There are two perfor mance tests the standard Detector Efficiency Test page 90 and an optional Acute Test which establishes that the sampling head will verify that the check source spectrum has sufficient activity to set its Acute alarm within three times the programmed acute alarm interval For older CAM Head that do not support programmable acute alarm intervals this time is fixed at 75 seconds This optional second test is available with all ASM1000s having ASM V2 06 or higher firmware with an A suffix V2 06A for example If the version number has a B suf fix the test is not available Units are shipped from the factory with this test disabled Other Diagnostics on page 210 tells you how to check your firmware version number and Firmware Update and Acute Test Option on page 220 tells you how to update the firmware and how to enable the Acute Test option Checking System Performance Conducting a Performance Check To conduct a Performance Check you 1l need a test source such as the Model ASO80 241 Am source which is built into a red filter cartridge as well as a set of freshly prepared standard black filter cartridges If the optional Acute Test is enabled page 220 the source for this check must have its alpha
67. 20 s housing using its three pan head screws If your unit has the ASO10 In Line Manifold option put its circular plastic spacer inside the top of the Manifold Mount the AS020 on the top of the sampling head using the three Phillips head screws which held the sampling head s original cover in place A CAUTION Use a maximum of 6 inch pounds 0 7 newton meter of torque Excessive force can crack the plastic Checking for Proper Operation Turn on the sampling head s power Depending on how the sampling head Annunciators were configured the audible and or visual alarms may be activated To verify proper op eration use the ASM1000 s Diagnostic Menu to activate the sampling head s e Lamp Check 223 Maintenance e Audio Check Refer to Other Diagnostics on page 210 for details Configuring the Annunciators The default annunciator settings are discussed in Default Settings on page 21 To change the defaults use the external setup program see External Setup on page 22 The In Line Manifold The Model ASO10 In Line Manifold is normally shipped installed on the sampling head e To connect the Manifold s intake pipe to the sampling pipe refer to Sampling Pipe Connection below e Ifthe Manifold s intake pipe is not correctly aligned with the sampling pipe refer to Repositioning the Intake Pipe on page 225 for instructions e If you have ordered the In Line Manifold separately
68. 24 CAM s status bitmaps read only 25 CAM s Acute Limit Range 1 255 26 Calibration Source Energy in MeV Range 0 000 through 9 999 27 Alarm Method 0 DAC Hr 1 DAC 28 Acute Interval 6 to 1530 in 6 s increments 29 Acute Limit Multiplier 1 to 254 2A Number of retries 1 to 255 1 Hysteresis is applied to the air flow reading when in a Low or High Flow alarm state Its purpose is to prevent multiple alarms when the flow is near the alarm limits The hysteresis is only used for the alarm test it either reduces or increases the measured value by the specified percentage before making the decision to clear the alarm state The default value is 5 50 This does not affect the flow being used for air volume calculation 179 Technical Reference 2B Retry wait time 0 to 65535 in 55 ms units 2C Post command delay 0 to 32767 in 500 us units 2D Pre command delay 0 to 32767 in 500 us units 2E Calibration frequency in days 0 to 9999 2F Calibration warn ahead in weeks 0 to 255 30 Activate trouble light when calibration is due 0 no l yes 31 Flow alarm inhibits count cycle 0 no 1 yes lt value gt Unless specifically noted the value consist of one or more ASCII numeric characters representing the decimal value to be written into the variable Values may be specified in floating point notation A CAUTION In most cases no range check is being performed on the value being written It is up to the sender to perform t
69. 3 VOL I 6037 78 6852 38 7666 99 8481 64 9296 25 10168 2 The data transmission rate is selectable to match the characteristic of the Host Interface For the Model ASMO02 RS 232 Host Inter face the connection could be through a modem This parameter applies only to the Model ASMO1 RS 485 inter face which allows a multi drop network configuration Each ASM1000 must have a unique address This parameter applies only to the Model ASMO1 RS 485 Inter face It specifies the number of line turnaround characters sent when the ASM1000 recognizes that it has been addressed The al lowable range is from 2 to 19 turnaround characters After you ve made all necessary changes you can return to the Network Display or De tailed Display by pressing either NETWORK DISPLAY or DETAILED DISPLAY To enter one of the other parameter setup screens press the appropriately labeled function key 100 Modifying the System s Parameters Miscellaneous Parameters This group contains the altitude and temperature values used for flow calculation and the system timeout settings It is reached by pressing the Misc F4 key and uses the dialog box shown in Figure 60 Misc Parameters Altitude feet Temperature ideg Ki 298 Ti min Log In 60 LCD Backlight 15 Frequency day A Warn Ahead weeks La Activate Trouble Light ino CAM Offline Retry sec Flow Alarm Inhibits Cycle na tyez Alarm E Figure 60 The Miscellaneo
70. 3 cut out with components up then fasten the board to the chassis using the two threaded inserts 7 Install the ribbon cable e For the ASMO1 connect the cable between the connector board and J5 e For the ASMO2 connect the cable between the connector board and J6 J5 and J6 are on the bottom edge of the Printed Circuit board in the ASM1000 See Fig ure 66 The Model ASMI01 For the ASMO1 install the supplied Integrated Circuit MAX233 in the socket at location Ul4 on the base Printed Circuit board See Figure 66 The Model ASM02 For the ASMO2 remove integrated circuit U14 MAX233 from its socket on the base Printed Circuit board See Figure 66 149 Host Computer Interface pieog J91depy 0 algeo JOJ9NPUO sell pieog Jajdepy 0 a1qeo uoqd y er 4 peog 1 depy L 0 jqe9 uoqd y al 91985 pueoghey uuejy olpny pue sio e9 pul Aiddns Jaemog 0 JOJD9UUOD SS9UIBH SIM SS a PA LLLLLLLLLLLLLLLIN Gecoonl 9 2 ez 6Gecoen ppeeeees 6ecoon 900 oz a1qe9 uogdly pueog Aejay 1apuo erdads xajdng IN4 EO uonisod A10 0e xa dng yeH Zo Ll s8vsu EM vin anouay cOWSY 104 Figure 66 Main Board Layout 150 Installing the Configuration and Firmware Upgrade Software Completing the Installation Use the six smaller screws to fasten the panel to the chassis making sure that the ground strap on the left side loops under the panel with the screw passin
71. 9 cfm 14 2 to 282 9 L min The default is 0 5 cfm 14 2 L min This is the limit for the High Flow Rate Alarm and may be from 0 5 to 9 99 cfm 14 2 to 282 9 L min The default is 2 5 cfm 70 8 L min Note The High Flow limit must be greater than the Low Flow limit DAC hr Computation The following parameters are used to set the operating and analysis conditions for the spectrum analysis and DAC hr calculation functions in the ASM1000 For details on how these parameters affect those calculations see Chapter 1 Introduction and Appendix A Algorithms Confidence Level DAC Factor This is the statistical confidence level to be used for the DAC hr calculations It may range from 0 01 to 9 99 sigma The default is 1 65 sigma This is the conversion factor used to convert measured activity into DAC hours The allowable range is from 0 1 E 8 to 9 99E 14 The default is 2 x 10 wCi em which is appropriate for plutonium To change the exponent of the DAC Factor use VERT INDEX key to move the highlight to the mantissa field then use HORIZ INDEX to move it to the exponent field 95 96 Upper Energy Limit Analysis Window Count Cycle Acute Interval System Operation This is the energy in MeV of the upper limit of the portion of the spectrum which is to be analyzed It may range from 0 0 to 9 99 MeV The default is 5 7 MeV which is appropriate for plutonium The width of the spectrum analysis window
72. ACADAS SACADA i Completed HA H HA H H H HA for Calibration Source Activity dem 4 43E DB004 Count Time min B Figure 75 The Results of an Efficiency Calibration For further assistance the above procedure can be displayed on the ASM1000s screen by pressing the Help F4 button while in the Efficiency Calibration display Placing the System Back into Service When you are finished performing the calibration press NETWORK DISPLAY to end the process and return to the Network Display Note that it is possible to end the Efficiency Calibration at any time If you end the cali bration process without calibrating all of the sampling heads on the network those sam pling heads which were not calibrated will retain their old calibration results and their previous Last Filter Change date only those sampling heads that were actually cali brated will have their data updated Calibration If you open the door before the efficiency count is complete the calibration for that sam pling head will be aborted and the unit will remain in the primed state when the door is closed System Timeout To insure that the sampling head Door Alarms are not out of service for an excessive time during a Performance Check the ASM1000 starts the Automatic Logout timer page 57 at the beginning of the calibration process If the network has not been placed back in service at the end of the timeout interval the ASM1
73. Alpha Seniry CAM System User s Manual V3 0 9231204G ISO 9001 SYSTEM CERTIFIED Copyright 2005 Canberra Industries Inc All rights reserved The material in this document including all information pictures graphics and text is the property of Canberra Industries Inc and is protected by U S copyright laws and international copyright con ventions Canberra expressly grants the purchaser of this product the right to copy any material in this document for the purchaser s own use including as part of a submission to regulatory or legal authorities pursuant to the purchaser s legitimate business needs No material in this document may be copied by any third party or used for any commercial purpose or for any use other than that granted to the purchaser without the written permission of Can berra Industries Inc Canberra Industries 800 Research Parkway Meriden CT 06450 Tel 203 238 2351 FAX 203 235 1347 http www canberra com The information in this document describes the product as accu rately as possible but is subject to change without notice Printed in the United States of America PIPS are registered trademarks of Canberra Industries Inc Windows is trademarks or registered trademarks of Microsoft Corporation in the United States and or other countries Millipore is a register trademark of Millipore Corporation Table of Contents Preface 0 e 1 0 ix
74. At the bottom of the Performance Check screen you ll see the activity of the calibrated source that is to be used in the Source Activity field If the source you plan to use is of a different activity you can change this value using the techniques described in Source Information on page 103 The Count Time field displays the preset MCA acquisition time that will be used for the Performance Check This is presented for information only if you need to change the value refer to Source Information on page 103 If a release condition is detected on any Head while in the Primed state the Performance Test function will be aborted The Network Display and the appropriate annunciator will be activated The Performance Test Perform the following steps for each Sampling Head to be tested Primed heads are indi cated by the LEDs being set to Green On and Red Blinking 1 Open the door to the sampling head by turning the knob counterclockwise from CLOSE to OPEN and pulling outward This will cause the current data in the sampling head s MCA to be cleared and the MCA made ready for the Performance Check 2 Remove the filter cartridge and replace it with the Check Source then close the door and turn the knob from OPEN to CLOSE to latch it shut The MCA in the sampling head will now start counting the source The LEDs will be set Green Blinking and Red On to indicate that a count is in progress The status message will be shown as Count
75. E 6 7 8 dd Delete CAN CAN Figure 34 Sampling Head 1 Removed from the Network 4 Repeat steps 2 and 3 for any additional sampling heads you want to take off line When you are done press NETWORK DISPLAY to return to the Network Display Should you inadvertently select an N A sampling head for deletion the Error Message CAM already deleted will be displayed Press any key to acknowledge the message then select the correct sampling head 60 Configuring the System Network Adding Sampling Heads Placing a sampling head that had been taken off line Deleted back onto the CAM Net work is just as simple 1 Repeat steps 1 and 2 above to select the currently N A sampling head to be placed back on line A CAUTION Never add a sampling head to the network with an old filter Proper alpha counting can only be assured if the filter has been changed If no database was established for this head a Filter Change Date and Time entry will be made automatically If a database has been established you should follow the instructions in Changing the Filters on page 82 If this is the first time a CAM is being added or the serial number of the CAM being added is different than the serial number of the CAM previously connected at this address a Filter Change Date and Time entry will be made automatically 2 Press Add CAM F2 to change the sampling head s Status from N A or N A Database back to Auto as indicated b
76. E 01 lt cr gt 1 2000E 01 lt cr gt 1 3262E 00 lt cr gt 3 1527E 01 lt cr gt 3 9200E 02 lt cr gt 1 0500E 00 lt cr gt lt checksum gt lt EOT gt Air Volume 105800 liters Air Flow 57 3 L min Corrected CPM 15 3 counts min Corrected CPM Uncertainty 14 Uncorrected CPM 17 6 counts min Uncorrected CPM Uncertainty 11 DAC hours 5 3782 DAC hrs Concentration 0 54 dpm m Concentration Uncertainty 12 critical Level 1 3262 DAC hrs Filter Time 31 527 hours Energy Cal Equation slope 0 0392 MeV chan nel Energy Cal Equation Intercept 1 05 MeV Commands and Responses Setup Parameter Commands 20 25 These commands read and write various setup parameters for the ASM1000 and sam pling heads If the ASM1000 is in the process of self testing described in Self Test on page 199 or processing calculations at the end of a count cycle a Busy response is returned to the Host described in Busy Response Protocol on page 110 Read ASM Setup Parameters 20 This command reads various ASM1000 setup parameters These parameters apply to all sampling heads attached to the ASM1000 network Command lt AAC gt lt 20 gt lt checksum gt lt EOT gt Parameter AA RS 485 address hex of ASM1000 RS 232C 00 C CAM numter 0 not used 20 read ASM setup parameters command Response lt low flow gt lt cr gt lt high flow gt lt cr gt lt count cycle gt lt cr gt lt DAChr limit gt lt cr gt l
77. ED on the sampling head during a user initiated diagnostic test Audio Check This is posted while the system is annunciating the horn on the ASM1000 and the horn on the sampling head if the sampling head Alarm Option AS020 is installed during a user initiated diagnostic test Relay Check This is posted while the system is testing both states of the exposure relay and trouble relay on the ASM1000 and the sampling head during a user initiated diagnostic test Self Test Wait 2 min Periodically the ASM1000 tests each CAM s ADC and makes any necessary linearization adjustments based on the test results During this two minute self test you can neither access the sampling head nor look at its data The linearization is performed at least once every 24 hours while the sampling head is on line There will be at least 30 minutes between the last button push on the ASM1000 and the start of a linearization cycle In addition in a multiple head system there will be at least 30 minutes between each individual sampling head s linearization cycle Error Messages This section lists all of the ASM1000 s error messages Out of Range The value that you have entered is not within the acceptable range Check the manual for the acceptable range and re enter the number 199 200 Maintenance Invalid Entry Y our entry is invalid Check the manual for a valid entry and re enter No Entry An entry is required for this field In
78. If you are installing the Interface yourself go to Field Installation on page 148 To connect an installed interface to the ASM1000 system go to System Configuration on page 146 Message Protocol 106 This section defines the protocol for commands received by the ASM1000 and responses sent by the ASM1000 to the Host All commands and responses will consist of printable ASCII characters with the exception of EOT 0x04 No white space space or tab is permitted except within a string format The Host Computer will wait for a response to this command before issuing another command The Host Computer software must include a timeout routine to handle the case where communications with the ASM1000 cannot be completed lost power broken con nection etc The ASM1000 will not send any unsolicited data data not asked for by the Host Message Protocol The ASM1000 when using RS 485 Model ASMO1 will only respond to Commands whose address value is non zero and matches the address setting in the ASM1000 setup screen When using RS 232C Model ASMO02 the ASM1000 address in the command must be set to 00 since the ASM1000 only responds to commands whose address field is set to zero For commands that do not apply to a specific sampling head the CAM number in the command should be set to 0 and will be disregarded Unless otherwise stated in the Parameter description all data is transmitted in the Floating Point format D
79. OT Example Read Limited Calculated Data from CAM 1 on ASM at address 15 Summary Alarm Status on page 111 or EnhancedSummary Alarm Status on page 112 Arithmetic is shown in hexadecimal lt 0F1 gt lt 18 gt lt checksum gt lt EOT gt 24 0 30 F 46 1931 1 31 8 38 134 plus string length 0F118 6 134 6 13A truncate to 8 bits 13A 3A resulting com mand string 0F1183A 110 Commands and Responses Commands and Responses There are six basic types of Commands Status ASM1000 CAMs Alarms calculated analog values setup parameters ASM1000 and CAM alarm management data base and spectral data Status Commands 10 3A 11 3B E1 The status commands provide the status of the ASM1000 and the sampling heads at tached to it Summary Alarm Status 10 This command provides a quick alarm status summary of all the CAMs attached to the ASM1000 Based on the response to this command a more detailed look ata CAM may be performed using Detailed CAM Status page 115 Command lt AAC gt lt 10 gt lt checksum gt lt EOT gt Parameter AA RS 485 address hex of ASM1000 RS 232C 00 C CAM numter 0 not used 10 Summary alarm status command Response lt on line status gt lt cr gt lt radiation alarm gt lt cr gt lt trouble alarm gt lt cr gt lt data available gt lt cr gt lt checksum gt lt EOT gt Size 16 bytes Parameter on line status on line status of CAMs binary form
80. Responses Response Size Parameter 30 lt entries gt lt cr gt lt CAM gt lt cr gt lt alarm gt lt cr gt lt fault gt lt cr gt lt date gt lt cr gt lt time gt lt cr gt checksum gt lt EOT gt read alarm log command 1507 bytes maximum for 50 entries at 30 bytes entry entries CAM alarm number of alarm log entries integer format the CAM through time block is repeated entries times CAM number that this entry belongs to integer format alarm type binary format 2 byte bit 0 bit 1 bit 2 bit 3 bit 4 bit 5 bit 6 bit 7 bit 8 bit 9 acute release chronic release low air flow high air flow sampling head power fail detector power fail door open no data collect no spectral data sampling head off line bit 10 high background bit 11 energy cal shift exceeded bit 12 peak shift exceeded bit 13 not used bit 14 instrument fault bit 15 not used 127 Host Computer Interface fault number if alarm is an instrument fault binary format 2 bytes fault numbers less than 80004 are ASM faults 0001 invalid chart channel for linearization 0002 linearization compensation limit ex ceeded 0003 error building linearization table 0004 insufficient linearization data 0005 hard CAM re initialization 0006 invalid CAM efficiency 0007 invalid filter change date 0008 invalid CAM flow table 0009 invalid energy slope value
81. S 233 Sampling Head 24 6004 2 0464 oR EERE PERE REDDER ORD RES we a 238 SPeCiHiCatlONns sve Ai wow a a o Get wy ew a a ee ee he a 241 D FCC Notices 0 0 0 2 ee ee ee ee ee ee 249 INDEX cies e Oe OS SOS ee e ee ee ea A AA Menu Flow Chart 6 6 6 ee 6 6 ew Be ee ee ee 251 viii Preface Canberra s Alpha Sentry Continuous Air Monitor CAM System the most advanced continuous air monitor on the market today gives you e Increased confidence by eliminating false alarms due to radon e Increased sensitivity and decreased cost per sampling location e Increased safety with up to eight sampling heads operated from a single control ler an entire room can be monitored for a potential release from a point safely out side the room About This Manual This manual s four chapters cover Introduction to the system Installation System Opera tion and the optional Host Computer Interface In addition there are four appendices Algorithms Technical Reference Maintenance and FCC Notices Typographic Conventions The following typographic conventions will be used throughout this manual SMALL Small capital letters indicate the names of the controls connectors CAPITALS and keypad keys such as ENTER or CLEAR boldface Boldface type refers to messages or items on the ASM1000 s dis play Notes 1 Introduction The Alpha Sentry Continuous Air Monitor CAM System resolves many of the issues fa
82. TE sos aoe ae a a a a Se Ree et he A o oe 29 The ASM1000 Connection sea saei tereraa ee 29 Performing an External Setup socom ee 31 Setting the PC s Communications Parameters 2 2 2 e e 31 Starting the Program sor eg ee 32 The Display Screens eeuu den a bre ot are de eee ere wee eee or ae 33 Alarm Annunciation o so er Bae RE RE RR Ee ee ee eR RE 33 The ASM1000 Amnunciators ass ie ee 33 The Sampling Head Annunciators ee 34 The Security System i s s Pi wee e HS ER ES 35 Assigning the Access Levels Vii a poa aa da ES Ew ea Pah e 37 Setting Up the Access Codes 2 a ea a a a e ee 37 Completing the Operation s sos ote eee Sea ele de we ow we ewe BOE ea 39 Entering the CAM ID Labels ss soe 233 ma ee Bee e ee ee ee 39 Establishing the CAM Alarm Parameters 2 0 ee 40 Restoring the Network s ses sesos ee ee 42 Setup Commands 2 424 00 25 beg eee ae Sa Shee ERE DEES ESE RRS a 42 3 System Operation ee 43 What You Need to Do First ss i es ai o 43 A Guided LOU hoja cs A a a a a a 44 The CAM Sampling Head lev ss e ad a de a a Eos 44 Controls and Indicators aa oea u e a e E E e a e e a a E 45 Sampling Head Connectors s ess eike awa ee 46 The Alpha Sentry Manager 47 Controls and Indicators e e e ea eae e e eie ea waa 48 Numeric Keypad Conventions s se s ad 2 2 a e ea E e p E a e a a 50 ASM1000 Connectors o i soraya eaaa ee a a
83. Volt power supply is out of limit beyond plus or minus 1 00020 The 5 Volt power supply is out of limit beyond plus or minus 6 00040 The 12 Volt power supply is out of limit beyond plus or minus 6 00100 There is a checksum PROM error The PROM is checked at power up 00200 There is a RAM test error The RAM is checked at power up 00400 The Watchdog timer is not programmed It is set at the factory to be active it moni tors program execution and will be initialized if an abnormality occurs 01000 An EEPROM error occurred when trying to write to the sampling head This is an in dication that the sampling head requires hardware servicing call Canberra s Customer Service Department 02000 There is a Command Execution Error Call Canberra Customer Service 04000 There is an analog channel error The preamplifier amplifier and ADC are checked at power up ASM1000 Fault Octal Values This section lists the ASM1000 fault octal values with an explanation for each fault Un like with the sampling head you will not see multiple faults causing an ASM Fault alarm Any ASM1000 Fault that you see will be directly represented in this section 00001 The ASM1000 could not find a valid starting point to begin its linearization of the ADC indicates a gross fault with the ADC 203 204 Maintenance 00002 The linearization compensation limit 50 has been exceeded indicates a gross fault with th
84. acute release has occurred e Generate an alarm at the Sampling Head in the event that an acute release is de tected plus send the alarm status to the ASM1000 e Monitor its own status sending readings of values such as the detector bias voltage and air flow rate to the ASM1000 for alarm limit checking and reporting 44 A Guided Tour Controls and Indicators The controls and indicators for the Sampling Head are located near its door as shown in Figure 24 and the connectors are located in its base The purpose of each will be covered briefly here and in greater detail when specific operations requiring their use are de scribed Figure 24 The Sampling Head s Door Reverse Video System messages and visual confirmation of alarm conditions are shown on the screen as reverse video that is dark characters on a white background Door Open Close This is a mechanical rotary locking mechanism used to open and close the door which provides access to the Sampling Head s Filter Chamber see Figure 24 To open the door rotate the knob counter clockwise until it points to OPEN and then pull outward on the knob This will swing out the Filter Cartridge tray To close the door swing it shut and turn the knob clockwise until the indicator points to CLOSE Before trying the door control be aware that opening the door on a sampling head con nected to the network will cause a Door Open alarm to be generated We ll be covering
85. ad is operat ing properly Problems which are detected are called Instrument Faults and include e Low Air Flow e High Air Flow e CAM Sampling Head Power Failure e Detector Bias Supply Power Failure e Door Open e No Data Acquisition Excessive Energy Calibration Shift Sampling Head Off line e N consecutive No Counts cycles In addition when power is first applied to a Sampling Head the Head does an extensive self test of its memory microprocessor and amplifier If an error is detected an Instru ment Fault will be reported See Error Messages on page 199 for information on how these errors are displayed in the Alarm Log The Factory Default annunciation for these alarms is e The optional Strobe lamp is illuminated e The optional Slow Audio Alarm is activated 27 Installation e The Trouble Relay Output is activated e Pressing the STOP ALARM button will silence the Audio Output High Background The alarms in this class are the detection of an excessive background level Background so high that counting statistics make computing the set DAC hour limit calculations im possible at a Sampling Head There are no annunciators activated by the default setting for this alarm class Security System Defaults To prevent unauthorized access to the Alpha Sentry CAM system the ASM1000 in cludes a security system with access code authorization As 1t comes from the factory this system is not enabled all ASM1000 o
86. address gt lt CAM gt lt D 1 gt lt checksum gt lt EOT gt The CAM in the command is ignored Response lt length gt lt cr gt lt checksum gt lt EOT gt Parameters lt length gt One ASCII numeric character representing the decimal value of the number of digits that make up the access range values Valid length value is 0 through 9 183 184 Set Menu Protection Technical Reference The SetMenuProtection command assigns a access level range to the specified menu Menu items are specified through their lt id gt value Command lt address gt lt CAM gt lt C2 gt lt id gt lt cr gt lt range gt lt cr gt lt checksum gt lt EOT gt The CAM in the command is ignored Parameters lt id gt Menu identifier specified as two ASCII alphanumeric characters representing the hex value of the menu item as follows Id 00 01 02 03 04 05 06 07 08 09 OA OB OC 0D Menu Button Filter Change Performance Check Data Review System Setup Log In Log Out Filter Change Help Performance Check Help Data Review History Trends Data Review Alarm Log Data Review History Trends Trend Type System Setup Parameter Setup System Setup Source Information System Setup Cam Control System Setup Network Configuration Setup Interface Commands and Responses 0E OF 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 20 21 22 System Setup Calibration Data Review H
87. all zeroes on the display In the time that elapses between the receipt of the clear command by the sampling head and the display of the data some counts will almost certainly have been acquired If the sampling head is stopped when the data is cleared you will see the spectrum change to all zeroes and acquisition will not begin until you press the Manual Start Stop F2 button Returning the Sampling Head to the Network When you re finished manually controlling the sampling head press Auto Manual F1 to return the sampling head to automatic network control Note that the ASM 1000 does not record the air volume while in the manual mode so you must perform a Filter Change when returning to the auto mode If you want to manually control another sampling head press CAM Status Table F4 repeat the steps we just covered starting with Selecting the Sampling Head on page 72 Press NETWORK DISPLAY to return to the Network Display or press DETAILED DISPLAY to return to the Detailed Display If you should return to the Network Display before returning the sampling head to auto matic network control this will be indicated as shown in Figure 46 where the status for CAM 4 is shown as Manual to remind you that it is still under manual control and not being used for monitoring 81 System Operation CAM_Netuork Display L m_DACh Filter Perf Data Sys tem Change Check Revien Setup Figure 46 CAM 4 Is Still Under Manual C
88. alled J103 will be a 9 pin D style male connector e If the Model ASM02 RS 232C interface is installed J103 will be a 25 pin D style male connector Model ASMO1 RS 485 If the ASMO1 is installed you will need to connect the ASM1000 network to your Host Computer cabled as a multi drop network as shown in Figure 65 The network must be terminated at both ends Each ASM1000 has a 120 ohm resistor across pins 3 and 8 of J103 which can be used as a terminator The RS 485 network can be up to 1200 meters 4000 feet in total length The recom mended cable is a Belden 3105A RS485 Cable or equivalent UL Listed cable Host Interface Network Configuration With the half duplex transmission scheme employed in this interface each ASM1000 lis tens to the command sent by the Host Included in the message is an Address The ad dressed ASM1000 will recognize the command and after a suitable delay which gives the computer time to remove its transmit circuit from the RS 483 bus the ASM1000 will respond System Configuration ASM1000 ASM1000 Computer ASM1000 A OS ai Pes Termination Termination ASM1000 ASM1000 ASM1000 Computer a aa a ae Termination Termination WIRING TO ASM1000 Signal Pin DATA A 9 DATA B 5 Shield Ground 4 FOR TERMINATION On the ASM1000 Connector J103 Connect Pin 3 to Pin 5 Pin 8 to Pin 9 WIRING TO COMPUTER DATA A Mark Logic 1 is Po
89. ameters are set for SETUP and 9600 baud If you have changed these to use a serial printer you ll have to use the following proce dure 1 Press System Setup F4 then Param Setup F1 then Commun F3 This will take you to the screen shown in Figure 12 Communication Parameters Config estan Printer Baud 1200 2400 29600 19 2K Optional ESs 232 Host Interface Port 1200 2400 296005 19 2K Alarm Setup Commun Figure 12 The ASM1000 Communication Parameters 2 Ifthe Standard RS 232 Port section at the top of the screen looks as shown in Figure 12 the parameters are correctly set just press the ASM1000 s NETWORK DISPLAY key and go on to the next section Performing an External Setup 30 Performing an External Setup 3 Ifthe parameters do not look as shown perform the following as needed A To change the Configuration from Printer to Setup press the HORIZ INDEX key to move the reverse video highlight to the word Setup B Press VERT INDEX to move the highlight to the Baud Rate row C Press HORIZ INDEX as needed to move the highlight to the 9600 speed then press ENTER D Press NETWORK DISPLAY and you re ready to go on Performing an External Setup Now that the ASM1000 is ready for the external setup and the 578 Alpha Sentry PC Setup software has been installed the next step is activate the program Setting the PC s Communications Parameters From the computer s Start menu lo
90. and Filter Pressure Drop 12 44 kPa 50 in H20 across sampling head with AS047 filter paper at 0 94x 10 m s 2 cfm using 1700 cartridge or 0 47 X10 m s 1 cfm using 450 car tridge Filter Model AS047 Type Millipore SS Pore Size 3 um Active Diameter with 1700 PIPS 42 mm with 450 PIPS 24 mm 241 Maintenance E ah oO b jab A E S a Ss D E jab A 2000 28 3 l min 011 56 6 l min ARA 85 0 l min 4 6 8 10 20 Aerodynamic Particle Diameter um Figure 88 Equivalent Diameter vsl Percent Penetration Filter Cartridge Size 450 mm 1700 mm OD 4 765 cm 1 876 in 4 765 cm 1 876 in ID 2 390 cm 0 941 in 4 191 cm 1 650 in Height 1 91 cm 0 750 in 1 91 cm 0 750 in Communications Number of Sampling Heads Up to eight on a single ASM1000 242 Specifications Single Head Cable Length 3 m 10 ft cable standard maximum distance for single sampling head powered directly from ASM1000 is 45 m 150 ft using 22 gauge wire for the power cable maximum distance for single sampling head powered locally is 1200 m 4000 ft The latter requires a Model CA2001 Network Terminator Multi dropped Head Cable Length Total network distance RS 485 is 1200 m 4000 ft maximum Communications With External Computers Model ASMO1 or ASMO2 Communications Package hardware protocol and documen tation Communications Ports Sampling Head RS 485 for communicati
91. and the first seven characters of your custom ID as shown in Figure 29 3 SouthEex 85 B 43 4 F uA Lm DACh Figure 28 Standard ID Figure 29 Custom ID There are up to eight Display Boxes one for each of the Heads in the CAM Network Each Display Box contains the following information Bar Graphs N A Manual If bar graphs are being displayed in a sampling head s display box this tells you that the sampling head is on line and currently being used for monitoring The left bar in Figure 28 shows the current air flow rate through the sampling head and the right bar shows the current DAC hour value which the ASM1000 has computed for that sampling head If either measurement exceeds the scale the bar will become lighter in color If an alarm condition be detected the Display Box will be shown in reverse video if its factory default hasn t been changed like the one for CAM 3 in Figure 30 Handling those alarms and determining their cause is covered in Handling Alarms on page 62 This stands for Not Available which means that the sampling head associated with that display box is currently not being used It may have been manually taken off line for routine service or it may not physically be present at your installation This indicates that the sampling head associated with that CAM Display Box is on line to the Network but currently under manual control and is not being used for monitoring at the present t
92. aned with a variety of cleaning agents Consult Canberra before using a questionable substance Cleaning the remainder of the air path requires disassembly of the Head See MCA on page 216 for specific details on how to remove and install the stainless steel Detector Shield Can Once it is removed the can detector and the inner air passageway can be cleaned Cleaning the PIPS Detector The PIPS detector must be handled with care The implanted face contact is very thin in order to achieve high efficiency and good resolution for alpha particles Do not touch the surface with anything that might cause scratches or abrasions Use plastic cover when in stalling detectors in or removing them from alpha spectrometers The PIPS detector can be cleaned to remove oil film fingerprints or dust particles on the surface Some recoil contamination can be removed by cleaning as well but recoil parti cles are often embedded in the surface and cannot be entirely removed 214 Disassembly and Reassembly For proper cleaning the PIPS detector should be removed from the CAM Head Refer to Preamplifier Amplifier and Detector Removal procedure on page 219 To clean standard PIPS detectors first blow dry air or N gas on the surface to remove particles that might cause scratches in the subsequent cleaning step Then use a cotton ball dampened with a good grade of isopropyl alcohol Do not use methyl alcohol Avoid excess wetting of the detector as
93. art of which can be used to establish an average value for the spectrum at channel Xo Region 1 between X and X where the plutonium counts are confined Region 2 between X and X where the 6 05 MeV peak appears Region 3 between X and X3 where the 7 68 MeV peak appears and Region 4 above X3 where the 8 78 MeV peak appears In addition we define Yo as the counts at valley point Xo Y as the counts at valley point X Y as the counts at valley point X and Y as the counts at valley point X4 The valley channels X can be established based on the energy calibration and the fol lowing information Energy of the first meaningful data channel in the spectrum Energy of the nuclide Pu of interest in MeV Energy of the valley between the Pu energy and the 6 05 MeV background peak Energy of the valley between the 6 05 MeV background peak and the 7 68 MeV background peak and Energy of the valley between the 7 68 MeV background peak and the 8 78 MeV background peak As can be seen in Figure 73 the background peaks have pronounced tails which must be subtracted from Region 1 to calculate the net plutonium content in the spectrum 162 Spectrum Analysis ES Pu Counts El 6 05 MeV Peak ES 7 68 MeV Peak ES 8 78 MeV Peak ES S oO E e B 2 2 o 150 Channel Figure 73 Example of Tails Due to Background Peaks To calculate these tails let us a
94. as included in the Detailed Display along with a few more items of interest These new items are Status This tells you whether the sampling head is under control of the ASM1000 s program Auto or under operator control via the ASM1000 s front panel Manual Auto is the normal setting and will be the one you see unless the sampling head has been manually taken off line Alarm The alarm from this sampling head if any is shown in this entry Error This is the statistical uncertainty of the reported DAC hr calcula tion shown in the line above Error CPM This is the number of counts detected events per minute within the Transuranic region of the spectrum This is the portion of the spectrum which contains the energies of the radionuclides that are being analyzed and monitored Note that the DAC hr values here may differ very slightly from the value shown in the historical trend s cursor detail This is because the last average flow volume is used in this calculation whereas the historical trend uses the total volume since the last filter change which is slightly more accurate 73 System Operation To view the spectrum from another sampling head select it with the procedure described in Selecting the Sampling Head to View on page 72 To return to the Network Display press NETWORK DISPLAY to go back to the Detailed Display press DETAILED DISPLAY History Trends As the ASM1000 monitors the CAM Network it bui
95. ase High Background Instrument Fault Stop Alarm Button Handling Alarms Types of Alarms The Alpha Sentry CAM System can generate four different classes of alarms Each class the events which can trigger that class of alarm and the Factory Default Annunciation is described in the following sections In the following discussions the audible annuncia tors referred to are e Fast An intermittent loud tone with a period of one half second e Slow An intermittent tone with a period of two seconds e Loud tone A continuous tone at approximately 90 dB e Soft tone A continuous tone at approximately 70 dB at the ASM1000 and 84 dB at the Head with the ASO20 Alarm Option Acute Release This class has only one possible cause the detection of an Acute Release by a Sampling Head It is triggered when the Sampling Head senses a rapid increase in the net count rate counts above background in the spectrum that is being collected For details on the spe cific algorithm that is used refer to Appendix A Algorithms The Factory Default annun ciation for this alarm is At the ASM1000 1 The Red indicator on the top of the ASM1000 is illuminated 2 The Fast Audio Alarm from the ASM1000 is activated 3 The Exposure Relay Output changes state 4 Inthe Network and Detailed Displays the CAM Display Box for the sampling head which detected the alarm is changed to reverse vid
96. at 1 byte appropriate bit 1 on line and counting ap propriate bit 0 any other state bit 0 CAM 1 bit 1 CAM 2 bit 2 CAM 3 bit 3 CAM 4 bit 4 CAM 5 bit 5 CAM 6 bit 6 CAM 7 bit 7 CAM 8 111 Host Computer Interface radiation radiation alarm status of CAMs binary format alarm 1 byte appropriate bit 0 no radiation alarm bit 0 CAM 1 bit 1 CAM 2 bit 2 CAM 3 bit 3 CAM 4 bit 4 CAM 5 bit 5 CAM 6 bit 6 CAM 7 bit 7 CAM 8 trouble alarm trouble alarm status of CAMs binary format 1 byte appropriate bit 0 no trouble alarm bit 0 CAM 1 bit 1 CAM 2 bit 2 CAM 3 bit 3 CAM 4 bit 4 CAM 5 bit 5 CAM 6 bit 6 CAM 7 bit 7 CAM 8 data available new data available binary format 1 byte ap propriate bit 0 data not available bit 0 CAM 1 bit 1 CAM 2 bit 2 CAM 3 bit 3 CAM 4 bit 4 CAM 5 bit 5 CAM 6 bit 6 CAM 7 bit 7 CAM 8 Note The New Data Available bit means that a count cycle has ended and its calculated data is available for read out It will remain set until the calculated data is read by the Read Calculated Data Commands pages 117 118 and 118 for the appropri ate sampling head at which time it is reset Enhanced Summary Alarm Status 3A Similar to Summary Alarm Status 10 but includes the maintenance status Its response is faster because the 3A command is serviced as soon as it is received Command lt AAC gt l
97. ata Formats The Host Computer Interface supports the following six data formats Strings 1 e software version numbers Transmit as ASCII characters directly and delimit with a carriage return lt cr gt Example Ver 1 0 lt cr gt Binary data i e bit mapped items Translate each 4 bit sequence into ASCII hexadecimal 0 9 A F and delimit with a carriage return lt cr gt Example 15 lt cr gt 1 byte bit map bits 0 2 and 4 Integer data i e spectral data Transmit as ASCII directly and delimit with a carriage return lt cr gt Example 614 lt cr gt 614 Floating Point data i e wide range analog values Transmit as ASCII x xxxxEsnn and delimit with a carriage return lt cr gt Where s is the sign of the exponent nn The number of significant digits x xxxx are fixed at five Unless otherwise stated all data will use this format Example 2 6340E 01 lt cr gt 26 34 5 2004E 02 lt cr gt 0 052004 Time data i e time stamps Transmit in ASCII as hh mm ss 24 hour clock and delimit with a carriage return lt cr gt Example 14 35 10 lt cr gt 2 35 10 PM 107 Host Computer Interface 6 Date data 1 e date stamps Transmit in ASCH as dd mm yy and delimit with a carriage return lt cr gt Example 04 01 92 lt cr gt 4 January 1992 Line Turnaround Each end is responsible for turning the line around for receive and transmit The ASM1000 upon recei
98. ated The date and time are displayed as well as the associated data value The cursor is moved in single display point increments to the right or left using the key pad s arrow keys You can jump ten display points to the right by pressing the HORIZ INDEX key The data that you are viewing may be compressed which is indicated by a X in the cen ter of the screen This compression is automatic so that you can view the maximum amount of data A maximum of 128 points is displayed 76 Viewing System Data Note that the display is of the highest absolute value of the number of data points com pressed For instance if the compression factor is 3 indicated by an 3X then out of each three data points the highest value is graphed as a single point To view each point you can select Cursor Detail which is never compressed The Alarm Graph Directly below the Trend Graph is a graph that is used to display the status of the release alarms over time Positive upward excursions indicate the presence of an Acute Re lease negative excursions are used to indicate a Chronic Release The duration of a re lease is shown by the length of the step in the data trace If an Acute and a Chronic Release occur at the same time only the Acute Release will be displayed Viewing the Detail Data To obtain an expanded view of the data in an area of the trend graph position the data cursor at the center of the area to be expanded
99. ault number listed in the Alarm Log matches one of the numbers in the table then there was only that single fault If the Fault number listed in the Alarm Log does not match one of the numbers in the ta ble then the number is actually a compilation of multiple faults For example if you see CAM Fault 00005 it indicates the following two faults Flow out of limit 00001 and 24 Volt Power Supply out of limit 00004 CAM Fault 00302 indicates a PROM Checksum Error 00100 a RAM Test Error 00200 and a 12 Volts Out of Limit 00002 For the most part you should only see a single fault 00001 The flow rate is out of limit These limits are the default setting for the head and are normally replaced by the settings indicated in the ASM1000 However in the event that the ASM1000 is not present these default limits are used The limits are 1 63 volts approximately 0 3 scfm for low flow and 4 98 volts approximately 3 scfm for high flow The exact conversion from voltage to flow is dependent upon the individual unit s calibration Starting with ASM1000 firmware Version 2 09 or CAM Head firmware Version 1 1 06 CAM Fault 0001 will not be reported but in standalone mode the Head will set an Instrument Fault at the default limits 00002 The 12 Volt power supply is out of limit beyond plus or minus 6 00004 The 24 Volt power supply is out of limit beyond plus or minus 6 202 Information and Error Messages 00010 The 10
100. ault time interval for this automatic logout is 60 minutes but this value may have been changed by the System Manager during system installation and setup Take care not to set this time too short or you may be logged out in the middle of an op eration such as a Performance Check 57 System Operation Configuring the System Network 58 The display in Figure 32 shows the status of all of the Sampling Heads in your CAM Network Note that there is also a key called NETWORK DISPLAY Pressing this key will cause the ASM1000 to immediately revert to the Network Display unless an error message is dis played this requires that any key be pressed before going on the system is expecting a CAM or a help page is being displayed the ENTER key must be pressed to exit the help page In this section we ll see how to configure the CAM Network and the impact any changes you make will have on the Network Display Automatic Configuration When the ASM1000 is initially powered up it automatically scans the CAM Network lo cates all available Sampling Heads downloads all needed parameters clears the alarm annunciators and turns on the Green Count LED on each Sampling Head While it s do ing this automatic configuration the messages Scanning CAM Circuit and Initial izing CAMs will be displayed in turn on the display If after manually changing the CAM Network Configuration you want to put the sam pling heads back on line y
101. be any lower than 1 3 seconds otherwise the communication will be unpredictable The added commands supporting the new features are Number of Retries Sets the command retry value which determines number of retries on a communica tion failure Acceptable limits are 1 255 Default is 5 Retry Wait Time Sets the response wait value which determines the amount of time to wait between retries on a communication failure Acceptable limits are 0 65535 Each unit is ap proximately 1 18 seconds Default is 54 for approximately 2 8 seconds Post Command Delay Sets the character delay value which determines the amount of time to wait after sending end of command character lt cr gt and turn the RS485 line for listening mode Acceptable limits are 0 32767 Each unit represents approximately 500 usec Default is 2 units for approximately 1 millisecond Pre Command Delay Sets command delay value which determines the amount of time between CAM commands Acceptable limits are 0 32767 Each unit is approximately 500 usec Default is 20 units for approximately 10 milliseconds Cleaning Procedures This section details the cleaning procedures for both the ASM1000 and the Sampling CAM Head ASM1000 This electronics chassis is essentially sealed except for a small opening for the LCD Con trast adjustment The keyboard is a sealed membrane switch design using polyester for the colored surface and polycarbonate for the clear window overlayi
102. ble alarm gt 8 bit bitmap indicating which CAM s have detected a trouble alarm Bit set 1 indicates CAM has detected an alarm lt data avail gt 8 bit bitmap indicating which CAM s have completed the analysis cycle and calculated data is available Bit set 1 indicates CAM has data available The data available flag can be reset by the Reset Data Available opcode E1h command the Read Limited Calcu lated Datal opcode 18h command or the Read Limited Calcu lated Data2 opcode 3Bh command This command is identical to the Summary Alarm Status command described on page 111 Read Enhanced Summary Alarm Status The ReadEnhancedSummaryAlarmStatus command provides a quick alarm status sum mary of all the CAMs attached to the ASM1000 188 Setup Interface Commands and Responses Command lt address gt lt CAM gt lt 3A gt lt checksum gt lt EOT gt Response lt online status gt lt cr gt lt rad alarm gt lt cr gt lt trouble alarm gt lt cr gt lt data avail gt lt cr gt lt maint status gt lt cr gt lt checksum gt lt EOT gt Parameters lt Online status gt lt rad alarm gt lt Trouble alarm gt lt data avail gt lt Maint status gt 8 bit bitmap indicating which CAM s are on line and communicat ing with the ASM1000 Bit set 1 indicates CAM is on line 8 bit bitmap indicating which CAM s have detected a radiation alarm chronic or acute Bit set 1 indicates CAM has detected an alarm 8 b
103. ble in the Alarm Log and individual results are saved in each Sampling Head s da tabase The Radon Rejection Screen The radon rejection screen in the Sampling Head of Canberra s Alpha Sentry CAM is a patented physical approach to dealing with radon progeny in the environment The screen 1s effective at removing from the sampled air up to 95 of unattached newly formed ra don progeny that would otherwise pass into the sampling head and deposit on the filter medium Plutonium and uranium particulates as well as attached aged radon progeny pass through the screen and collect on the filter Introduction Since some radon progeny do deposit on the filter the instrument must compensate them This is accomplished with Canberra s unique spectrum stripping algorithm which to gether with the radon rejection screen significantly increases Alpha Sentry s detection sensitivity particularly in environments with high levels of unattached radon progeny Unattached radon progeny have not been in the environment long enough to attach to other progeny to water molecules or to particles of dust They are quite small between 1 and 10 nm diameter relative to other molecules in the air and they diffuse through the air in rather tortuous paths reminiscent of Brownian motion as a result of multiple random collisions The radon rejection screen works by adsorbing the chemically reactive unattached radon progeny The important dimensions of the scree
104. cate and activate the AsmASPC application program If the installation program s defaults were used a new group named Canberra ASM1000 should have been created under the Programs section of your Start Menu If you cannot locate the AsmASPC Exe application through the Start menu you must lo cate it manually using the Windows Explorer The Setup Port screen Figure 13 is the first screen displayed when AsmASPC is started It is also accessible from the Setup Port menu within the program m Host Port Port COM1 y Advanced 45M1000 Port J 102 Standard RS232 J 103 RS232 Host Interface J 103 R5485 Host Interface Figure 13 The Setup Port Baud a500 h l Help Cancel 31 32 Installation Under the Host Port group select the available serial port that will be used to communi cate with the ASM1000 Under the ASM1000 Port group select the communication port through which the ASM1000 will be connected to the Host Port with Although the setup utility can com municate through either ASM1000 port for the initial setup select the Standard RS 232 port on J102 Under the Baud group select the communication baud rate for the Host Port and ASM1000 The baud rate for the selected port at the ASM1000 must be selected through the ASM1000 menu The Advanced button is used to select the direction control signal and polarity when the selected Host Port has RS485 capabilit
105. ccess Level Three 925 975 range of codes e Access Level Four 456 single code only Now that we have logically thought out Access Levels and assigned Access Codes the next step is to implement the system by assigning the Access Levels to the various ASM1000 menu functions The Security System Assigning the Access Levels We ll start by assigning the Access Levels to the various ASM1000 Menu Functions To do that you need to use the dialog box shown in Figure 17 You can reach the dialog box by selecting Level from the Security menu For the example you would assign the menu items Filter Change and Performance Check to Access Level 1 and Calibrate to Access Level 2 Personnel who have Access Level 3 can only perform Data Review functions Note that personnel with Access Level 4 can perform any function and they are the only ones who can access the System Setup i Assign Access Levels to Menu Access Level 1 45M1000 Menu Item Filter Change x Pis Performance Check x E de Data Review el Historical Trend __ Alarm Log Mew Spectrum H System Setup Parameter Setup Source Information CAM Control Network Configuration t Calibration PE EE ELELLELELLLL a A i Figure 17 The Assign Access Levels Dialog Setting Up the Access Codes Once the Access Levels have been assigned the next step is to set up the Access Codes
106. cent efficiency uncertainty 50 000 counts to about a 0 4 percent efficiency uncer tainty etc At efficiency calibration time the default energy calibration is used to calculate the ex pected location of the energy of the calibration source If the actual peak location is 5 or more channels away from the expected location an instrument alarm will be issued but no alarm log entry will be made At performance check time the system will also find the actual location of the calibration source peak and its expected location based on the default energy calibration If the ac tual peak location is 5 or more channels away from the expected location an instrument alarm will be issued but no alarm log entry will be made Flow Calibration A built in flow meter measures the air flow through the sampling head The meter is in ternally read as a voltage Before use each sampling head must be calibrated for its volt age vs flow rate This relationship is established with a flow calibration procedure where the voltage reading of the flow meter in the sampling head displayed in the flow calibration screen is associated with the actual flow rate producing the reading The ac tual flow rate in standard cubic feet per minute must be established with a separate cali brated flow meter Refer to CAM Air Flow Calibration on page 197 for the air flow calibration procedure Five different readings that span the flow rate range of interest must be
107. cing Alpha CAM users today such as false alarms due to radon sensitivity safety of personnel and cost per sampling location It addresses the problem of false alarms due to varying concentrations of radon decay progeny with a two fold approach physical removal through a patented radon rejection screen and mathematical subtraction of the remainder with a stripping algorithm Com pensation for radon daughters not only lowers the false alarm rate it also increases sensi tivity Increased safety of personnel is assured by the distributed architecture of the Alpha Sen try With up to eight sampling heads operated from a single ASM1000 controller a large facility can be monitored in safety from a remote station Sharing the controller also lowers the cost per sampling location In addition networking to a laboratory wide computer is easier only one network connection is required for eight sampling heads Each sampling head has a two fold function in the Alpha Sentry System The first is to collect airborne particulates onto an internal filter and detect any alpha radiation present The second is to determine the occurrence of an acute release The air is drawn into the sampling head through the radon rejection screen and through the filter by way of a vacuum connection A PIPS Passivated Implanted Planar Silicon radiation detector is positioned above the filter to detect the alpha radiation Signal pro cessing electronics which incl
108. consists of at least one Manager and one Alpha Sentry Sampling Head and covers the external PC setup procedure Various system configurations are shown in Figure 8 The ASM1000 Manager is only available in 115 V ac version System Configuration 12 The ASM1000 system is powered by 115 V ac at 60 Hz ac and is configured at the fac tory with a 2 m 6 ft line cord terminated in a NEMA 5 15P Grounding Plug Configuring the Sampling Head Power to the Sampling Head is approximately 24 volt ac The ASM1000 can provide this power to one Sampling Head within 45 m 150 ft Each ASM1000 is shipped with a 3 m 10 ft C2003 cable to provide power to one Head For multiple Heads or those posi tioned beyond the 45 m limit there must be a power supply for each head The Model AS070 Sampling Head Power Supply is used with 115 V ac mains The three feet on the lower housing are for securing the Head to a mounting surface The Head will operate in any orientation once a filter cartridge has been put into position The normal orientation of the lower housing puts the cable connectors under the filter drawer If your location requires it the housing is easily rotated by 120 degrees either clockwise or counter clockwise This is done by first disconnecting all cables then re moving the three 6 Phillips head screws on the bottom of the Head and slowly dropping the dark gray metal MCA Assembly from the upper plastic Now you can rotate the MCA Assembly i
109. d 2 The Slow Audio Alarm from the ASM1000 is activated 3 The Trouble Relay Output changes state 4 Inthe Network and Detailed Displays the CAM Display Box for the Sampling Head which detected the alarm is changed to reverse video as shown in Figure 30 on page 54 5 The alarm is entered into the ASM1000 s Alarm Log At the Sampling Head 1 The Optional Strobe lamp is illuminated 67 System Operation 2 The Optional Slow Audio Alarm Output is activated 3 The Trouble Relay Output changes state 4 The Red LED is illuminated Acknowledging Alarms Stop Alarm Button The STOP ALARM button on the ASM1000 keypad is used to acknowledge an alarm When it is pressed the Factory Default is to silence the Audible Annunciators but to keep all of the other indicators and outputs active Note that this action of STOP ALARM can be used to turn off any annunciator except the screen s reverse video according to your specific installation requirements Refer to Table 9 on page 64 and Table 10 on page 64 to verify the operation of this button on your system Resetting an Alarm There is no manual reset nor is one required All alarms that are not affected by the STOP ALARM button will remain set until the condition which caused the alarm has been recti fied When the condition clears the alarm is automatically reset and the alarm logic re armed Any annunciators that are set to stop when the STOP ALARM button is pressed wi
110. d The values are as fol lows 00 Access level 1 01 Access level 2 02 Access level 3 03 Access level 4 Response lt value l gt lt cr gt lt value2 gt lt cr gt lt checksum gt lt EOT gt Parameters lt valuel gt A total of Length numeric characters ranging from 0 to 999999999 representing the numeric value of the access range s start limit 182 Setup Interface Commands and Responses lt value2 gt A total of Length numeric characters ranging from 0 to 999999999 representing the numeric value of the access range s stop limit Length is specified through the SetMenuAccessLength command as a value between 0 and 9 It determines the number of digits that will be returned when the access range is read or the number of digits that must be written when the access range is set Set Menu Access Length The SetMenuAccessLength command specifies the number of digits that make up the ac cess range values Command lt address gt lt CAM gt lt C 1 gt lt length gt lt cr gt lt checksum gt lt EOT gt The CAM in the command is ignored Parameters lt length gt Two ASCII numeric characters representing the decimal value of the number of digits that make up the access range values Valid length value is 00 through 09 Response lt checksum gt lt EOT gt Read Menu Access Length The ReadMenuAccessLength command returns the current setting for the number of dig its that make up the access range values Command lt
111. d Red Blinking Open the door remove the check source and insert a new filter cartridge You must insert a fresh filter since the system assumes a new filter at this point 6 Now close the door and latch it which will end the Performance Check and return the sampling head to normal operation This will be indicated at the Sampling Head by the LEDs changing to Green On and Red Off Note If you forgot to remove the source the sampling head will be in Maintenance Mode as indicated on the Network Display and will not resume auto counting un til the source is removed Removing the source will take the sampling head out of Maintenance Mode 1 This fixed time is either three times the programmed acute alarm interval for newer CAMs supporting programmable acute alarm interval or fixed at 75 seconds for older CAM Head that do not support programmable acute alarm intervals 91 System Operation The results of the test can be seen at the ASM1000 as shown in Figure 55 The Status column will contain either Pass or Fail and the Counts and Eff values will be up dated with the new values Performance Check Status PASS H H H H H H H 3 CAM 1 2 3 4 a 6 7 2 BA BA CAM Heads primed for Ferformance Check Source Activity dem 3 59 7E1 004 Count Time min 8 5 Figure 55 The Results of a Performance Test The newly calculated value is for reference only it is not used in any calculation
112. d Warn Ahead Parameter D3 2F This command reads the current setting for the Warn Ahead parameter Command lt AAC gt lt D3 gt lt 2F gt lt checksum gt lt EOT gt Size 11 bytes Parameter AA RS 485 address hex of ASM1000 set to 00 for RS232C C CAM number D3 read Variable opcode 2F identifier code for Warn Ahead parameter Response lt value gt lt checksum gt lt EOT gt 142 Commands and Responses Size 15 bytes Parameter lt value gt possible values are 0 to 25519 Write Activate Trouble Light Parameter C3 30 This command tells the ASM1000 whether to activate the Trouble Light when the cali bration due message is issued The light will be active for the duration of the message When the message is acknowledged the light is turned off This feature bypasses the ASM1000s annunciator table settings since its occurrence is not considered a alarm con dition Valid settings are 0 to disable or 1 to enable Initial default setting is 0 to disable Command lt AAC gt lt C3 gt lt 30 gt lt value gt lt checksum gt lt EOT gt Size 11 number of digits in lt value gt Parameter AA RS 485 address hex of ASM1000 set to 00 for RS232C C CAM number C3 write Variable opcode 30 identifier code for Activate Trouble Light pa rameter lt value gt Oor 1 Response lt checksum gt lt EOT gt Size 4 bytes Read Activate Trouble Light Parameter D3 30 This command reads the current setting for the Activate Troubl
113. d to connect the Sampling Head to a vacuum source The Alpha Sentry Manager Next we ll take a quick tour of the ASM1000 Alpha Sentry Manager which provides the supervisory and display functions for the CAM Network Among the functions per formed by the ASM1000 are e Analysis parameter and alarm limit downloading to the sampling heads e Network status display e Individual sampling head status and spectrum display e Analysis of the spectra acquired by the sampling heads and accumulation of the re sults for use in chronic alarm condition testing e Alarm logging display and annunciation e Trend data display and database updating e System setup and control for routine maintenance and performance checks e Remote computer communications via an optional host interface port 47 System Operation Controls and Indicators The following briefly describes the various ASM1000 controls and indicators which can be seen in Figure 25 We ll be looking at each in greater detail later in this chapter when we get into the specifics of the various ASM1000 operations A Ofsentry octnve CANBERRA Litt tt 4 Eye e es STOP DETAILED NETWORK ALARM DISPLAY DISPLAY VERT INDEX HORIZ INDEX CANCEL ENTER Figure 25 Front View of the ASM1000 Local Alarm Indicators On the very top of the ASM1000 you ll find an audio annunciator plus amber and red in dicator lamps These are activated
114. d when the monitored environment has a high dust level requiring frequent cleaning of the screen to remove debris But some words of cau tion are in order In an environment with high dust levels it is common for the fraction of attached radon progeny to dominate over the unattached fraction but one cannot assume this to be the case without carefully examining the air exchange characteristics of that environment If there is sufficient air exchange the fraction of unattached radon progeny may be higher than expected In such a case the radon rejection screen would have some value regard less of the dust level High dust level alone is not sufficient to determine the fraction of attached radon progeny Time and the air exchange rate are also very important Theory of Operation Chronic Release Determination The primary difficulty in determining whether a chronic release has occurred is the inter ference from the radon daughters in the transuranic TRU region As can be seen in Figure 2 each of the three radon daughter peaks 6 05 MeV 7 68 MeV and 8 78 MeV have a pronounced tail which is caused by several factors First of all by counting alpha particles in air you get some energy degradation because the alpha parti cles collide with air molecules on their way to the detector and lose some energy Some alphas will lose their energy just by passing through the entrance window of the detector particularly those entering at an angle F
115. digits in lt value gt Parameter AA RS 485 address hex of ASM1000 set to 00 for RS232C C CAM number C3 write Variable opcode 2E identifier code for Calibration Frequency param eter lt value gt 0 to 99991 Response lt checksum gt lt EOT gt Size 4 bytes Read Calibration Frequency Parameter D3 2E This command reads the current setting for the Calibration Frequency parameter Command lt AAC gt lt D3 gt lt 2E gt lt checksum gt lt EOT gt Size 11 bytes Parameter AA RS 485 address hex of ASM1000 set to 00 for RS232C C CAM number D3 read Variable opcode 2E identifier code for Calibration Frequency param eter Response lt value gt lt checksum gt lt EOT gt Size 15 bytes Parameter lt value gt possible values are 0 to 9999 j9 141 Host Computer Interface Write Warn Ahead Parameter C3 2F This command tells the ASM1000 how far ahead before any of the CAMs calibration is due to start posting calibration due messages to the operator The value is expressed in weeks Valid settings are O through 255 weeks Initial default setting is 2 weeks Command lt AAC gt lt C3 gt lt 2F gt lt value gt lt checksum gt lt EOT gt Size 11 number of digits in lt value gt Parameter AA RS 485 address hex of ASM1000 set to 00 for RS232C C CAM number C3 write Variable opcode 2F identifier code for Warn Ahead parameter lt value gt 0 to 25549 Response lt checksum gt lt EOT gt Size 4 bytes Rea
116. e When satisfied that the coordinates of the points are correct press the Horiz Index key again to enter them When all points are entered the CAM Flow Status line can be used to verify the Sys tem s calculation with the calibration meter The SCFM value should agree within 5 of the meter s measurement The CFM value is the flow corrected for Temperature and Alti tude Exiting the menu screen will save these values in the Sampling Head being calibrated Information and Error Messages The ASM1000 generates two types of messages Information messages are posted while the system is busy and cannot perform your operational request immediately Error mes sages indicate either improper operation or a potential system problem 198 Information and Error Messages Information Messages This section lists the ASM1000 s six information messages Scanning CAM Circuit Ini tializing CAMs Lamp Check Audio Check Relay Check and Self Test Scanning CAM Circuit The ASM1000 is scanning the network for existing sampling heads This is posted upon initial power up or immediately following an auto configuration Initializing CAMS The ASM1000 is down loading initial information to the sampling heads such as the alarm configuration Lamp Check This is posted while the system is illuminating the alarm lights on the ASM1000 the alarm light on the sampling head if the sampling head Alarm Option AS020 is in stalled and the ALARM L
117. e ADC 00003 An error was encountered while the ASM1000 was trying to build the linearization compensation table This indicates a gross fault with the ADC 00004 There is insufficient data to build the linearization compensation table Indicates a gross fault with the ADC 00005 The sampling head has gone through a re initialization most likely due to a momen tary interruption of power and has lost any setup parameters previously downloaded from the ASM1000 Perform an auto configuration or Add the sampling head under System Setup to ensure that the proper setup parameters are reloaded into the sampling head 00006 The ASM1000 has found an invalid efficiency for this sampling head Check the effi ciency for that sampling head it cannot be greater than 100 00007 The ASM1000 has found an invalid filter change date for this sampling head Check the filter change date for that sampling head 00010 The ASM1000 has found an invalid flow calibration for this sampling head Check the flow calibration for that sampling head to ensure that it is within the acceptable range of 0 5 to 3 cfm 00011 The ASM1000 has found an invalid energy slope value for this sampling head Check the energy calibration for that sampling head to ensure that it is valid 00012 The Performance Check was aborted before the test was completed and the source re moved 00013 The Filter Change has been aborted with the door still open In
118. e Light parameter Command lt AAC gt lt D3 gt lt 30 gt lt checksum gt lt EOT gt Size 11 bytes Parameter AA RS 485 address hex of ASM1000 set to 00 for RS232C C CAM number 143 Host Computer Interface D3 read Variable opcode 30 identifier code for Activate Trouble Light pa rameter Response lt value gt lt checksum gt lt EOT gt Size 15 bytes Parameter lt value gt possible values are 0 or 1 ASM1000 Communications Setup The Communications Setup screen in the ASM1000 is reached by choosing Setup then Communications from the ASM1000 menu The upper portion of the screen is the set up of the standard RS 232C port used for a serial printer or the S578 Alpha Sentry PC Setup Software The port must be configured for Printer if the Host Interface is to be active The lower portion of the screen is the set up of the optional Host Interface port If you have this option your ASM1000 has been configured for either RS 485 ASMO1 or RS 232C ASMO02 which the ASM1000 determines upon power up Figures 62 through 64 show the Communication Setup screen for each of the Host Inter face possibilities None RS 232C or RS 485 Communication Paraneters Config z Printer Baud 1200 2400 56003 19 2K Figure 62 No Host Interface 144 ASM1000 Communications Setup Communication Parameters Standard RS lt 3 Port Config Se tup Printer 3 Baud 1200 2400 9688 19 2K Detional RS 252 Host Interface Port
119. e resistance The face of the detector is coated but care should still be used when handling it It can be cleaned with a cotton ball soaked in acetone Remove the Detector Shield Can O Ring Clean and inspect then snap it back into position in the groove under the Alignment Ring A CAUTION Do not remove the Alignment Ring The O Ring can be removed with the Alignment Ring in place The Detector Shield Can is stainless steel and can be cleaned with most cleaning agents With the Detector Shield Can removed the inner air passageway is exposed and can be cleaned Reinstalling the Detector Shield Can 1 Slide the Detector Shield Can into the plastic assembly Note that there is a guide pin on the Alignment Ring that properly positions the can Push the can down as far as it will go The set screws determine the proper gap Position the Preamp Shield on the Detector Shield Can The guide pin is used to make the proper alignment of the shield Secure the Detector Shield Can to the plastic with the three hex nuts Disassembly and Reassembly A CAUTION Use a maximum of 6 inch pounds 0 7 newton meter of torque Excessive force can deform the ring and change the detector to sample gap 4 Reconnect the 10 pin wiring connector to the Preamplifier Amplifier board 5 Ifyou have the Model AS010 In Line Manifold option put its circular plastic Spacer inside the top of the Manifold before replacing the cover Secure the cover plate
120. eadMenuProtection 187 The ASO20 alarm 0 0 223 ReadRawCPM 191 The firm Wate ose eae wena 220 ReadSummaryAlarmStatus 188 The firmware upgrade software 151 ReadVariable 180 The host interface oooooooomoooo o 148 Reinstalling the ASO20 alarm 232 The inline manifold 0 227 Removing the ASO20 alarm 228 The setup software 0 00008 29 Repositioning the intake pipe 225 Instrument fault alarm ResetDataAvailable 187 ASMITODO conocio nat weaned e te 25 Response protocols host 108 Sampling head oc cues eka ces te 27 RS 232 connector o o ooo 20 Intake pipe repositioning 225 S L Sampling head Log Configuring the o ooo ooooooocmoomoo o 12 PSV ATTN ia a 71 Controlling diiniita id 78 O 56 Operations 2 oi e 80 A A Heese a dn EE 57 Returning to the network 81 Selecting Ao cs gee deea ges eset 79 252 Viewing its data edr eee eee eee 72 Wall mounting 0 0 c ee eee eee 17 Sampling head alarm Acute TELEASE oo ova eee ae ewe tees 26 Chronic release ena eras 27 High background 28 Instrument fault 0 005 27 Sampling pipe connecting the 224 Selecting a sampling head 79 Serial printer configuration 98 SetAccessRange
121. ecalibration It is not intended to give step by step guidance in operating the system which is covered in Chapter 3 System Operation It also does not contain the equations used in the calcula tions Those are covered in Appendix A Algorithms Alpha Sentry Operating Philosophy Alpha air monitoring presents difficulties due to the fact that small amounts of trans uranic particulates need to be determined in the presence of large amounts of radon daughter products The Alpha Sentry has been designed to minimize the impact of the ra don progeny in the sample Theory of Operation Each Sampling Head continuously collects data into its multichannel analyzer This data 1s constantly monitored for the presence of an acute release as explained in Acute Re lease Determination on page 7 Periodically at a time preset by the user the ASM1000 reads out the spectrum from each Sampling Head applies a background stripping algo rithm and determines if a chronic release has occurred Canberra recommends that this cycle count time be at least 15 30 minutes for reasonable counting statistics better sen sitivity and fewer false alarms When the spectrum is read out the MCA s memory is erased and a new count cycle be gins By erasing the spectrum we are reducing the background so that any radon progeny that have already decayed will not be seen in the next spectrum Any transuranic activity on the filter will remain in the next spect
122. econds Initial default setting is 2 for approximately 1 millisecond Command lt AAC gt lt C3 gt lt 2C gt lt value gt lt checksum gt lt EOT gt Size 11 number of digits in lt value gt Parameter AA RS 485 address hex of ASM1000 set to 00 for RS232C C CAM number C3 write Variable opcode 2C identifier code for Post Command Delay param eter lt value gt 0 to 3276710 Response lt checksum gt lt EOT gt Size 4 bytes 138 Commands and Responses Read Post Command Delay Parameter D3 2C This command reads the current setting for the Post Command Delay parameter Command lt AAC gt lt D3 gt lt 2C gt lt checksum gt lt EOT gt Size 11 byte Parameter AA RS 485 address hex of ASM1000 set to 00 for RS232C C CAM number D3 read Variable opcode 2C identifier code for Post Command Delay param eter Response lt value gt lt checksum gt lt EOT gt Size 15 bytes Parameter lt value gt possible values are 0 to 32767 9 Write Pre Command Delay Parameter C3 2D This command sets the Pre Command Delay value in the ASM1000 which determines the amount of time to wait between consecutive CAM commands Acceptable limits are 0 through 32767 Each unit represents approximately 500 microseconds Initial default setting is 20 for approximately 10 milliseconds Command lt AAC gt lt C3 gt lt 2D gt lt value gt lt checksum gt lt EOT gt Size 11 number of digits in lt value gt Parameter AA RS 485 address
123. econds The very first request after applying power to the system activates the CPM calculation within the CAM head as result returned values at this time will be zeroes Once activated the CPM calculation for the specified CAM will remain active until power to the ASM1000 is cycled 192 Calibration C Maintenance This appendix covers calibration routines a listing of the system s error messages pre ventive maintenance cleaning procedures disassembly and reassembly of the units pro cedures for updating the firmware a listing of connectors and signals and complete specifications Calibration This section includes the routines for energy calibration efficiency calibration and flow calibration Sampling Head Energy Calibration The detector installed in the Head is a Passivated Planar Silicon PIPS detector espe cially engineered by Canberra for this application The detector comes in two sizes 450 mm in the AS450 and 1700 mm in the AS1700 The detector and its associated Preamplifier and Amplifier are assembled into a shielded can in the top half of the sampling head Factory calibration electrical and mechanical have been made for Gain and Low end cut off These will not require adjustment in nor mal use A unique part of the analysis algorithm is the automatic and continuous adjust ment of the Energy calibration that is Energy versus MCA channel number The firmware automatically tracks any shifting from filter
124. ee 157 Efficiency Calibratioi sa an oa gee BOM a aa a a A 157 Plow Calibration 2 o wd rr ads ea ae ww we we 158 Spectrum Analysis s sno 0D S 0 ea dee ea a 159 Automatic Energy Recalibration 2 2 0 ee 159 Background Compensation sce a waa i e e aaa ee 161 Analysis RESULTS 5 Cuni Qe a a e aa ao A A e ae a 166 Alarm COIG 1 alg wate eaa o a a Ae ea A E web E a E a A s 170 Whe Acute Alarni gt aa a oa a esa A E ae 170 The Chronic Alarm o eee oe Re CR RE ER OR EER HER EEE EES 170 The High Background AlaM e 171 Technical Reference lt lt 172 Setup Command Protocol sa oe eas aoe woane ade dr Ra a aa i 172 Setup Interface Commands and Responses 2 2 0 000 eee ee 174 Set Alarm Template ce ped be RRR ERNE CER AA 174 Read Alarm Template ee 177 Set Variabl s cp cece bedaet orar era bared eae ede eaeeau du 178 Read Variable sos mms o ow de Ee he aoe ew A a we oe dw 180 pet Access Range sn fous age ede ARA dead Oba AR 181 Read Access Range e e se cee eR eig OR EER ERE RE HE OE OHS 182 Set Menu Access Length os se e fe ee 183 Read Menu Access Length e 183 Set Menu Protection s e 4 as 40404 o A RR we ew ww t 184 Read Menu Protections 0 02 824 ewe ee oa Sr we a G a 187 Reset Data Available 187 Read Summary Alarm Status ee ee 188 Read Enhanced Summary Alarm Status 2 2 0
125. elay 1 ASM relay 2 ASM alarm log ASM screen CAM light 1 CAM light 2 CAM audio loud CAM audio soft CAM relay 1 CAM relay 2 CAM audio pulse ASM audio pulse Two ASCII alphanumeric characters representing the hex value of the class for the alarm annunciators as follows 175 Technical Reference 00 acute class 01 chronic class 02 high background class 03 instrument fault class 04 stop button class lt control gt Two ASCII alphanumeric characters representing the hex value of the annunciator control as follows 00 turn annunciator OFF 01 turn annunciator ON Response lt checksum gt lt EOT gt Example To disable the alarm log entries for the high background class alarms the values for lt device gt lt class gt and lt control gt are as follows lt device gt 0040 selects alarm log lt class gt 02 selects high background class lt control gt 00 selects OFF Assuming address is 01 and CAM is 1 the actual command string would consist of 19 characters and the response of 4 characters The contents would be as follows Command 011A00040 0D 02 0D 00D7 04 Response 2B 04 For clarity non printing characters are shown as hh where hh is their hex value 176 Setup Interface Commands and Responses Read Alarm Template The ReadAlarmTemplate command returns the setting for alarm table bit in the lt device gt parameter from the alarm lt class gt parameter The an
126. elay contacts are rated for 0 3 amp maxi mum at 30 volts ac or de 19 Installation Normally the No Alarm terminal is connected to the common terminal but when a specific condition does occur the common terminal is connected to the condition s alarm terminal For example the normal state of the Trouble Relay is 1 to 3 if an alarm is de tected or if power is removed connection 2 to 3 is activated Table 2 Alarm Terminal Board Terminal Description 1 Trouble No Alarm 2 Trouble Alarm 3 Trouble Common 4 Exposure Alarm 5 Exposure No Alarm 6 Exposure Common RS 232 Connections 20 A male 25 pin connector provides an RS 232 communication port equivalent to the one on an Industry Standard Architecture PC Connection to a Laptop Computer for setup is done using the Model C2004 Null Modem cable that is provided with the Model S578 Alpha Sentry PC Setup software For connection to most serial printers the Model C1546 cable can be used The factory setup of the ASM1000 is to allow the setup program to configure the system refer to External Setup on page 22 If a printer is to be connected the selection is done in the Communications Parameter menu screen from Network Display Screen press F4 then F1 then F3 Flow control with the printer is done using XON XOFF pro tocol The ASCII characters are sent with 8 data bits per character and NO Parity Data transfer rates of 1200
127. ening in the sampling head top cover and remove the top cover AS010 Installation Procedure To install the Model ASO10 you ll first have to disconnect the sampling head s power and remove its top cover 1 Disconnect power to the sampling head 2 Remove and discard the three flat head screws holding the top cover on the sampling head These screws will not be re used longer replacement screws are required and are supplied as part of the installation kit 228 The In Line Manifold 3 Ifthe thinner 1 8 in 3 mm O ring was not installed inside the top flange of the In Line Manifold at the factory install it as shown in Figure 86 1 8in x Jin e IN LINE MANIFOLD Figure 86 Placing the 1 8 in x 7 in O Ring 4 Place the metal Air Intake Seal Ring over the top of the sampling head and let it rest in a temporary position below the air intake area as shown in Figure 87 The angled side of the Ring should be facing upward The ring s final position will be between the Manifold and the sampling head 5 Position the In Line Manifold over the top of the sampling head s air intake screen as shown in Figure 87 6 Align the In Line Manifold s intake pipe to the desired orientation Make sure that the Manifold is vertically straight then push firmly down on the top of the Manifold until it snaps onto the Head 7 Put the Spacer inside the top of the In Line Manifold as shown in Figure 87 229 Maintenance
128. eo as shown previously in Figure 30 5 The alarm is entered into the ASM1000 s Alarm Log At the Sampling Head 1 The Optional Strobe is illuminated 2 The Optional Fast Audio Alarm is activated 3 The Exposure Relay Output changes state 4 The Red LED is illuminated 65 System Operation Chronic Release This class also has only one possible cause the determination by the ASM1000 that the cumulative dose measured by a given Sampling Head has exceeded the permissible DAC hr level When detected the Factory Default annunciation for this alarm is as fol lows At the ASM1000 1 The Red indicator on the top of the ASM1000 is illuminated 2 The Fast Audio Alarm from the ASM1000 is activated 3 The Exposure Relay Output changes state 4 Inthe Network and Detailed Displays the CAM Display Box for the sampling head which detected the alarm is changed to reverse video as shown in Figure 30 on page 54 5 The alarm is entered into the ASM1000 s Alarm Log At the Sampling Head 1 The Optional Strobe is illuminated 2 The Optional Fast Audio Alarm is activated 3 The Exposure Relay Output changes state 4 The Red LED is illuminated High Background The alarm in this class is for the detection of an excessive Background Level Back ground so high that counting statistics make computing the set DAC hour limit calcula tions impossible at a Sampling Head When detected the Factory Default annunciation f
129. error will be posted 209 Maintenance Other Diagnostics There are several diagnostics that can be used to manually to check the annunciators and to display the version numbers of the firmware in the ASM1000 and its attached sam pling heads To exit the Diagnostic menu press NETWORK DISPLAY These functions are activated from the Network Display by pressing SYSTEM SETUP F4 CALIB F5 and DIAG TEST F3 The diagnostic menu shown in Figure 77 gives you access to the following four diagnostics Diagnostics Device Under Test lt CAM gt ASH Lamp udio Relay Check Check Check Version Figure 77 The Diagnostics Menu Lamp Check CAM Cycles the LEDs and the optional Strobe lamp ASM1000 Cycles the Amber Trouble lamp and the Red Release lamp Horn CAM or ASM1000 Cycles through the four states of the horn 210 Preventive Maintenance Relay CAM or ASM1000 Cycles through the on off states of the Trouble and Exposure relays Version This diagnostic displays the version of both the ASM1000 and the Sampling Heads See Figure 78 Software Version ASH Version ASM Wi ic 11 66 92 Version Serial Humber Yer 1 1 68 12745673 9AERC HA H H NA NA NA NA CAM 1 2 3 4 5 6 7 3 Lamp udio Relay Check Check Check Merson Figure 78 Version Number Display Comm Stat This diagnostic helps fine tune certain communication related parameters when RF Modems or other non
130. esponse Size 121 bytes Parameter no counts efficiency effic date effic time air flow date air flow time id serial number version RS 485 address hex of ASM1000 RS 232C 00 CAM number read CAM setup parameters command lt no counts gt lt cr gt lt efficiency gt lt cr gt lt effic date gt lt cr gt lt effic time gt lt cr gt lt air flow date gt lt cr gt lt air flow time gt lt cr gt lt id gt lt cr gt lt serial number gt lt cr gt lt version gt lt cr gt lt checksum gt lt EOT gt number of no counts alarm limit integer format detector calibrated efficiency efficiency calibration date date format efficiency calibration time time format air flow calibration date date format air flow calibration time time format CAM ID string format 39 chars CAM serial number string format 12 chars CAM firmware version number string format up to 12 chars Write ASM Setup Parameters 23 This command writes various setup parameters to the ASM1000 123 124 Command Size Parameter 117 bytes AA 23 low flow high flow count cycle DAChr limit DAC factor upper energy analysis window confidence acute count lim Host Computer Interface lt AAC gt lt 23 gt lt low flow gt lt cr gt lt high flow gt lt cr gt lt count cycle gt lt cr gt lt DAChr limit gt lt cr gt lt DAC factor gt lt cr gt lt upper energy g
131. etting the ASM1000 s Communications Parame ters on page 30 for details on using this port to set the initial oper ating conditions and parameters for the ASM1000 Setup must not be selected when the optional Host Interface is to be active Printer When this port is configured for use with a serial printer and a serial printer is connected to the port a printout similar to the one shown in Figure 59 is produced at the completion of every count cycle Printer must be selected even if a printer is not con nected when the optional Host Interface is to be active The meaning of the number in the ALRM field is described in Alarms and Alarm Messages on page 201 The port s data transmission rate is set to your choice of the four listed values The chosen rate must match the rate of the device with which the ASM1000 is communicating 99 CAM DATE TIME ALRM 26Jan93 19 14 11 0000 26Jan93 19 34 11 0000 26Jan93 19 54 11 0000 26Jan93 20 14 11 0000 26Jan93 20 34 11 0000 26Jan93 20 55 11 0000 DACHR uCi mL 2 90 2 65E 13 2 830E 12 3 537E 13 2 47E 12 0 000E 00 5 779E 13 20 000 20 000 20 000 20 000 20 000 20 000 Figure 59 Sample Serial Printer Printout Optional Host Interface Port This selection will be presented only if the optional Host Interface is installed Baud Address Delay Characters System Operation ELAP m FILT m 148 417 168 417 188 417 208 417 228 417 249 83
132. expansion 5 points and press CURSOR DETAIL F3 The display will change to that shown in Figure 42 which displays the trend data and release alarm status in a numeric rather than graphical form CAM 1 Cursor Detail Cursor Date Time 11Jun92 14 07 Time CPM _ 14 32 2 38 14 27 2 81 14 22 4 15 14 17 14 12 14 67 14 61 Trend Cursor Ture Detail Figure 42 Viewing the Cursor Details When you first change to this display the highlight will be at the data point for the cur rent location of the data cursor which will be in the center of the screen You can move through one page of data at a time by pressing one of the INDEX keys Press the VERT INDEX key to move one page of entries back in time chronologically one page of entries minus one left on screen for reference Press the HORIZ INDEX key to move the data cursor earlier in time 77 System Operation Note that this Cursor Detail Data is uncompressed regardless of the compression factor used in the trend graph If you like you can change the parameter that is being viewed by using the Trend Type F2 key as described previously From the Trend Type dialog press Cursor Detail F3 to return to the numeric display or History Trend F1 to return to the graphics display When you ve finished viewing the Trend Data press either NETWORK DISPLAY or DETAILED DISPLAY to return to the Network Display or Detailed Display respectively Controlling a Sampling Head
133. f there is only one sampling head it will be chosen To select a differ ent sampling head press CAM F4 then press the number of the desired sampling head followed by ENTER when the Enter CAM Number dialog box pops up Viewing System Data Looking at the Data As you can see by the phrase Last Count Cycle in the first line of Figure 38 the system assumes you want to view the data from the most recently completed count cycle for the sampling head you ve selected Your other choices are Last Alarm which shows the data that was present the last time this sampling head generated a Release Alarm and Current which will allow you to view the data acquisition cycle that is currently in progress The same basic display is used for all three types with the F1 F2 and F3 respectively used to choose between them Note that if the setup is such that a Release Alarm does not generate an entry in the alarm log then it won t cause a spectrum to be saved as the Alarm Spectrum The Spectrum Display The spectrum display is fixed at a 1 to 11 MeV energy range for the X axis and uses autoscaling to set the Vertical Full Scale VFS to the best possible setting for viewing the data Because autoscaling is used based on the data in the transuranic region of the spectrum you ll see the VFS change as counts are accumulated during a Current dis play The Numeric Display Below the spectrum you ll see some of the same data that w
134. fault numbers greater than 8000 are the logi cal OR of CAM faults bit 0 flow out of limit bit 1 12 V out of limit bit 2 24 V out of limit bit 3 10 V out of limit bit 4 5 V out of limit bit 5 12 V out of limit bit 6 PROM checksum error bit 7 RAM test error bit 8 watchdog timer not programmed bit 9 EEPROM error bit 10 command execution error bit 11 amplifier error bit 12 not used bit 13 not used bit 14 not used bit 15 CAM fault date time stamp date date format time time stamp time time format Note If there are no Alarm Log entries entries and all the other parameters return a value of zero 00 00 00 and 00 00 00 for date and time Read Trend Data Base Info 31 This command reads information about the contents of the Trend data base for a particu lar sampling head 128 Commands and Responses Command Parameter Response Size Parameter lt AAC gt lt 31 gt lt checksum gt lt EOT gt AA C 31 lt entries gt lt cr gt lt used gt lt cr gt lt old date gt lt cr gt lt old time gt lt cr gt lt new date gt lt cr gt lt new time gt lt cr gt RS 485 address hex of ASM1000 RS 232C 00 CAM number read data base info command lt checksum gt lt EOT gt 40 bytes entries number of data base entries allocated for this used old date old time new date new time CAM integer format number of data base entries used by this CAM
135. for CAM 1 that are being displayed Viewing System Data CAM Hi Trend Graph ix D A C h r Acute T Chron Cursor Figure 39 The History Trend Display To change the data type press Trend Type F2 which will change the display to that shown in Figure 40 Trend Graph Axis p Flow Conc DAC hrs Cursor Detail Figure 40 Selecting the Data Type Use the HORIZ INDEX key to move the highlight to the desired type of data then press ENTER The parentheses will move to the new data type to indicate that the selection has been changed Press History Trend F1 to return to the Trend Graph display which will display the data type you just chose TO System Operation Viewing the Trend Data If CPM had been selected as the data type the display would look like the one in Figure 41 You ll notice that the display is divided into two sections the Trend Graph and the Alarm Graph CAM 1 Trend Graph ix Acute t Chron Figure 41 The Trend Graph for CPM Data The Trend Graph The upper part of the display shows the trend graph for the selected data with the X axis representing time and the Y axis representing the value of the units being plotted E The units are labeled vertically so that 10 is displayed as Pa You ll see a tall vertical bar at the extreme right of the trend graph This is a data cursor which when moved will display detailed information for the data point on which it is lo c
136. formance Check the ASM1000 starts a timer when the user logs in for a Performance Check If not finished when the timeout is reached the sampling heads will return to normal operation The timer used for this is the same one used for Automatic Logout which was described in Automatic Logout on page 57 The factory default time interval is 60 minutes but this can be changed by the System Manager during system installation and setup Modifying the System s Parameters In this section we ll be taking a look at the various ASM1000 editing functions that are available for changing the operating and alarm conditions for the CAM Network The initial values for all of the parameters used by the CAM Network were set either at the factory or by your System Manager during the external PC setup portion of the instal lation process Some of these parameters may also be modified from the ASM1000 if you have the access authorization to do so It is those ASM1000 modifiable parameters that will be discussed here Parameter Setup To enter the Parameter Setup mode from the Network Display press System Setup F4 then Param Setup F1 This will take you to the Parameters screen which allows you to select the type of parameter which you want to change alarms units communications or miscellaneous We ll be covering all of the various setup options which are available in turn In all cases the keyboard operating conventions described in Nume
137. formation and Error Messages Alarm Messages 0001 Acute release 0002 Chronic release 0004 Low air flow 0008 High air flow 0010 Main power supply failure in CAM assembly 0020 Detector power supply failure in CAM assembly 0040 CAM s door is open 0080 CAM s data acquisition is disabled 0100 No spectral data has been accumulated over the last n cycles 0200 CAM is not on line with the ASM1000 0400 High background detected 0800 Energy calibration exceeded the allowable shift 1000 Peak shift exceeded 205 Maintenance 2000 reserved 4000 CAM instrument fault Other Alarm Messages The remaining alarm messages are Acute Release An Acute Release has occurred Consult Acute Release Determination on page 7 for a definition of an Acute Release and Acute Alarm on page 170 for the algorithms used Chronic Release A Chronic Release has occurred Consult Chronic Release Determination on page 5 for a definition of a Chronic Release and Chronic Alarm on page 170 for the algo rithms used Low Air Flow The air flow is lower than the alarm limit specified in the ASM1000 High Air Flow The air flow is higher than the alarm limit specified in the ASM1000 CAM Power Fail The sampling head has experienced a power failure Door Open The sampling head door is open It must be closed or the unit will not operate No Data Collect The sampling head is not collectin
138. g by zero or attempting to take the square root of a negative number Call Canberra s Customer Service immediately Alarms and Alarm Messages This section list the ASM1000 s alarm messages the first messages listed are CAM fault octal values followed by the ASM1000 fault octal values then the meaning of the ALRM number sent to the optional printer 201 Maintenance The remainder of the alarm messages are English phrases Acute Release Chronic Re lease Low Air Flow High Air Flow CAM Power Fail Door Open No Data Collect No Spectral Data CAM Off Line High Background Ecal Shift Excd Peak Shift Excd No Filter Change and No Efficiency If an alarm is generated by the system it will appear in the Alarm Log as long as the ASM1000 has been set up to log that particular alarm during the Alpha Sentry PC setup Refer to Performing an External Setup on page 31 for PC setup instructions The instrument fault alarms are indicated in the Alarm Log as ASM or CAM Fault fol lowed by a number This number is an octal value indicating the specific fault that caused the alarm At the sampling head it is possible that an instrument alarm can have multiple faults associated with it With octal you will be able to ascertain precisely which faults are associated with an alarm if there is more than one CAM Fault Octal Values The individual CAM Fault octal values with an explanation for each fault are listed be low If the CAM F
139. g data No Spectral Data There is no data in the spectrum read in by the ASM1000 This alarm will appear after N consecutive times where N is specified by the user in the external PC setup The de fault value for N is 4 206 Preventive Maintenance CAM Off Line The sampling head unexpectedly is no longer available Check all connections then Add sampling head through the System Setup or perform an Auto Configuration De pending on the configuration of the annunciators the Auto configuration may be re quired to reset the alarms High Background The ASM1000 has determined that the background is too high to statistically calculate the DAC hr value within the limit set by the user Ecal Shift Excd The 7 68 MeV peak location has varied too much to allow the automatic energy recalibration to take place This limit is set by the user in the external PC setup This error will only occur at the completion of the first cycle Any subsequent excessive peak shifts will result in a Peak Shift Excd error Peak Shift Excd During the automatic energy recalibration the 7 68 MeV peak location has varied too much according tot he limit set by the user in the External PC Setup This is indicative of excessive filter loading This message is not put into the Alarm Log No Filter Change The ASM1000 cannot find a Filter Change date which it needs to calculate the end of count cycle results No Efficiency The ASM1000 cannot find a
140. g through it Reinstall the top cover using four Phillips head screws through the holes on the sides Apply power to the ASM1000 After approximately 30 seconds the normal operation should resume The next step is to physically connect the PC to and download interface parameters to the ASM1000 The Physical Link The connection between the PC and the ASM1000 must be made with the supplied Model C2004 Null Modem Cable to insure a correct connection At the ASM1000 end the connection is made to the port labeled J102 RS 232 This is the same port that is used for attaching a local serial printer to the ASM1000 if you re using a serial printer you ll have to disconnect it from the ASM1000 before connecting the PC cable At the PC end the connection is made to the available COMx port If your PC has a 25 pin COM port you ll have to use either a 25 pin to 9 pin adapter cable or a 25 pin null modem cable neither of which is supplied Installing the Configuration and Firmware Upgrade Software The following procedures are used to install the Model 579 Alpha Sentry Configuration and Firmware Upgrade software The installation procedures outlined here assumes a working familiarity with PCs and the Windows operating system The S579 Software If the S579 Configuration and Firmware Upgrade software has already been installed you can skip ahead to the next section Downloading Interface Parameters As with most software ins
141. gram options are reloaded through the standard RS 232 interface port on J102 To download interface parameters the Model 579 Configuration and Firmware Upgrade software will be required The Model 579 is included in the Alpha Sentry Setup Soft ware media supplied with the ASM1000 If you have not already installed the Model S579 refer to the previous section Installing the Configuration and Firmware Upgrade software and follow the installation instructions Be sure that the ASM1000 s J102 is connected to the host s COMx port through the C2004 cable From your Start menu on the PC locate the Canberra ASM1000 program group and ac tivate the AsmOption application program The following screen Figure 67 appears Downloading Interface Parameters ij ASMO1 ASMOZ Option Installer x r Select Program Options C Install 45M01 R5485 Host Interface on J103 C Install ASM02 RS232 Host Interface on J103 C Disable Host Interface on J103 Enable testing of acute alarm during Performance Check procedure i Figure 67 The ASM01 ASMO02 Option Installer Select one of the three possible host interface options then check whether the acute alarm should be tested during CAM maintenance operations When finished press the Accept button A confirmation step containing a summary of the program options with Yes No Cancel buttons will appear next as shown in Figure 68 Installing Program Options xi Following options w
142. guided tour of the equipment and then proceeds to the use of the system Should you require more details on the internal logic of the system or need specific cali bration and maintenance procedures refer to the appendices The use and operation of the Alpha Sentry CAM System is presented in a tutorial format with the various operating procedures being covered in the order in which you will most likely need to perform them in a typical installation For a quick reference to a specific function refer to the fold out Display Menu diagram inside the manual s rear cover What You Need to Do First To follow along with the examples in this chapter you will need a fully functioning Al pha Sentry CAM System that has been configured and installed as described in Chapter 2 Installation At a minimum the system must contain an ASM1000 Alpha Sentry Manager and at least one sampling head In addition spare Filter Cartridges Filter Paper and a Calibration Check Source all available from Canberra will be required Several operating characteristics of the Alpha Sentry System such as the Login Logout procedure and the manner in which alarms are handled can be uniquely configured to each installation Because of this flexibility certain sections of this chapter should be customized by the System Manager responsible for the initial setup of your system be fore you go on Specifically the following tables need to be tailored to your ins
143. h the ASM1000 through a serial port con nection Connect the Model C2004 cable between the computer s COMx port and J102 RS 232 on the ASM1000 The firmware program file that will be loaded into the ASM1000 named DRU EXE is typically supplied by Canberra on separate media Locate the supplied media and insert into the appropriate media drive on your PC From your Start menu on the PC locate the Canberra ASM1000 program group and ac tivate the AsmLoad application program The following screen Figure 82 appears 220 Firmware Update and Acute Test Option ia Select Host Port mm xj r Host Port Fort Baud 115200 cres Figure 82 Selecting the Host Port The highest baud rate should be fine for most computers Select a lower baud rate if your computer is very old or exhibits exceptionally slower responses Press Accept to con tinue or Cancel to exit The next screen Figure 83 is that of the configuration utility AsmLoad w AsmLoad ASM1000 Firmware Update Utility Port About Help Exit Firmware Updates if File Operations target file E DRU EXE Length 389500 Checksum 024889E9 Date 7 21 2005 3 01 04 PM Firmware 7 Program Options IV Reload firmware No Change Enable testing of Acute Alarm C No Host Interface TF during C RS232 Host Intfce peletience Check IF Erase bbram Release device when M done C R9485 Host Intfce Start completed Abort Cycle power to ASM
144. he current date and time as shown in Figure 52 Filter Change Record Last Change ID liHov92 13 39 HA NA NA HA HA HA HA CAM Heads Primed for Filter Change Figure 52 CAM 1 s Last Change Date Is Updated 86 Changing the Filter Until you choose Network Display to completely end the Filter Change you can perform multiple filter changes on the same unit although the Red LED will no longer indicate primed until the door is opened As a reminder the above procedure can be displayed on the ASM1000 s screen by press ing the Help F1 button while in the Change Filter display To display the second Help pag press the VERT INDEX key To return to the Change Filter display press ENTER Returning the System to Service When you have finished changing the filter cartridges press NETWORK DISPLAY to end the Filter Change process and return to the Network Display Note that it is possible to end the Filter Change process at any time Should you end the process without changing the filters on all of the sampling heads such as when chang ing a filter after a release alarm those sampling heads which did not have their filter cartridge replaced will retain their old Last Change date and time only those sampling heads whose filters had been changed will have their Last Change entry updated to indi cate the new filter change date and time System Timeout To insure that the sampling head Door Alarms a
145. he dialog box in Figure 31 67 0ct94 CAM Hetwork Display Enter Your Access Code Code Figure 31 The Log In Dialog 2 Type in your Access Code As you press the keys you ll notice that your code 1s kept secure asterisks are displayed instead of the numbers you pressed 3 After correctly typing in your code press ENTER If your Access Code is not accepted as valid the system will display the Invalid Access Code message Press CLEAR to acknowledge the message and try the Log In again 56 Log In and Log Out 4 If your code was accepted the screen will look like Figure 32 The label for F5 now says Log Out indicating that you have successfully logged onto the system and are ready to go on 870c1t394 Figure 32 The Log In is Complete Logging Out There are two ways of logging off the system you can do it yourself manually or you can let the system do it for you after a predetermined time without any keyboard activity Manual Log Out When you are finished using the ASM1000 you should always log off the system To do that all you have to do is press FS while its label says Log Out Don t do it now unless you want to log in again but make sure you log out when you re finished with the ASM1000 Automatic Logout If you forget to log off the system a built in timer will automatically log you out if more than a predetermined amount of time has elapsed without any keys having been pressed The factory def
146. he necessary range checking Writing invalid values can render the ASM1000 inoperable with possible loss of data So be very careful when writing Response lt checksum gt lt EOT gt Read Variable The ReadVariable command returns the value associated with the specified variable Variables are identified through a variable ID Command lt address gt lt CAM gt lt D3 gt lt id gt lt cr gt lt checksum gt lt EOT gt Parameters lt id gt Two ASCII alphanumeric characters representing the hex value of the variable identifier whose value is being set Refer to the SetVariable command for list of variable id s Response lt value gt lt cr gt lt checksum gt lt EOT gt 180 Setup Interface Commands and Responses Parameters lt value gt Set Access Range One or more alphanumeric characters representing the numeric value of the contents of the variable identifier whose value is being read Values are returned in floating point format Refer to the SetVariable command for list of valid variable id s The SetAccessRange command sets the access range for the specified access code level There are four access levels in the ASM1000 each capable of holding a access range of up to ten digits Command lt address gt lt CAM gt lt C0 gt lt level gt lt data gt lt cr gt lt checksum gt lt EOT gt The CAM in the command is ignored Parameters lt level gt lt data gt Two ASCII numeric characters re
147. he software into an appropriate media drive on your computer Depending on your computer setup the Windows Explorer may start au tomatically after inserting the media If not activate the Windows Explorer manually Navigate to the drive containing the software being installed select the S578 folder and activate the SETUP EXE installer program Follow on screen instructions until the installation has completed successfully If the in stallation program s defaults are used a new group named Canberra ASM1000 will be created under the Programs section of your Start Menu The Canberra ASM1000 group will contain the newly installed software The ASM1000 Connection The next step is to physically connect the PC to the ASM1000 29 Installation The Physical Link The connection between the PC and the ASM1000 must be made with the supplied Model C2004 Null Modem Cable to insure a correct connection At the ASM1000 end the connection is made to the port labeled J102 RS 232 This is the same port that is used for attaching a local serial printer to the ASM1000 if you re using a serial printer you ll have to disconnect it from the ASM1000 before connecting the PC cable At the PC end the connection is made to the available COMx serial port If your PC has a 25 pin COM port you 1l have to use a 25 pin to 9 pin adapter not supplied Setting the ASM1000 s Communications Parameters The ASM1000 s default communication par
148. he sum of raw data from X to X 1 minus the tail of the 8 78 MeV peak from X to X3 1 and N os 18 the net area of the 6 05 MeV peak that is the integral of its tail from X to X 1 plus the sum of raw data from X to X 1 minus the tail of the 8 78 MeV peak from X to X 1 and minus the tail of the 7 68 MeV peak from X to X 1 For a valid positive plutonium determination the plutonium area has to exceed its uncer tainty estimate multiplied by a desired confidence factor that is the Critical Level Lc in DAC hrs is defined as T ko Lo T b Zpac K V 1 12 where T is the time since the filter was changed in hours T is the spectrum collect time in hours V is the volume of air in liters that has gone through the filter since it was last changed y 1s the detector s counting efficiency Zpac is the nuclide DAC factor in uCi em K is the unit conversion factor to make the units match properly 1 332 x10 h DAC L and k is the confidence level coefficient selected through a setup screen This formalism allows the determination of the smallest true signal which may be de tected with a probability 1 B with a built in protection level against falsely conclud ing that a null observation represents a real signal Normally one would accept equal probabilities for errors of the first and the second kind In that case o and there is only a single value of k Representative value
149. hex of ASM1000 set to 00 for RS232C C CAM number C3 write Variable opcode 2D identifier code for Pre Command Delay parame ter 139 Host Computer Interface lt value gt 0 to 32767 0 Response lt checksum gt lt EOT gt Size 4 bytes Read Post Command Delay Parameter D3 2C This command reads the current setting for the Pre Command Delay parameter Command lt AAC gt lt D3 gt lt 2D gt lt checksum gt lt EOT gt Size 11 bytes Parameter AA RS 485 address hex of ASM1000 set to 00 for RS232C C CAM number D3 read Variable opcode 2C identifier code for Pre Command Delay parame ter Response lt value gt lt checksum gt lt EOT gt Size 15 bytes Parameter lt value gt possible values are 0 to 3276710 Calibration Warnings 2E 2F 30 These commands read and write various parameters for calibration warnings Supported in Version V2 14 and up Write Calibration Frequency Parameter C3 2E This command tells the ASM1000 the expected frequency for efficiency calibrations The value is expressed in days and is used internally in conjunction with the CAMs last calibration date to calculate the CAMs next calibration date Setting this parameter to zero will disable the efficiency calibration warnings Valid settings are O through 9999 y days Initial default setting is zero Command lt AAC gt lt C3 gt lt 2E gt lt value gt lt checksum gt lt EOT gt 140 Commands and Responses Size 11 number of
150. htly above the energy of the highest energy transuranic For instance if you re looking for Pu at 5 15 MeV you should set the Upper Energy Cut off at 5 7 MeV which is the default setting If the region is set too high so that it is quite close to the 6 05 MeV radon daughter peak you will have greater uncertainty in the calculated results The Analysis Window is the window width in MeV which defines the left hand limit of the TRU region the Upper Energy Cutoff setting minus the Analysis Window setting equals the left hand limit This should be positioned at the point where the counts in the combined tail region begin to slope upwards Xy in Figure 5 The default setting of the Analysis Window is 2 7 MeV which means that the left hand limit is 3 0 MeV 5 7 MeV 2 7 MeV 3 0 MeV Analysis Window in MeV Upper Energy Xo Left hand side Cutoff Default f the TRU 4 MeV Figure 5 Set Point for the Analysis Window Left Side of the Transuranic Region Theory of Operation If the window is too wide that is left hand side too low in energy where the tail is es sentially flat you will not get optimum results Due to the nature of the model it will fit a curve that is too sharp to properly encompass this flat portion of the tail Figure 6 shows this case Optimum pamu X too low 0 Figure 6 Left Side of the TRU is Set Too Low If the window is too narrow there is a potential that the Xy valley point will be
151. ies Refer to the program s on line help for ad ditional information Press the Accept button to proceed with the application or Cancel button to exit the ap plication Starting the Program With the communications port properly set up the program can now be used After hav ing activated the program you ll see a display like Figure 14 ij Alpha Sentry PC Setup Alarm Security Cam Setup Spedal Host About Help Exit Asm amp SPC V1 0 3 ASM32 DLL 06 05 47 2 COM FF 2005 1 35 18 PM Figure 14 The Main S578 Alpha Sentry PC Setup Screen Alarm Annunciation The Display Screen As with most Windows programs the application uses menus and other standard Win dows controls accessible through mouse clicks or keyboard Specific help is available throughout the application either through the Help menu explicit Help buttons or by pressing the F1 function key anywhere in the application As parameters are accessed the PC will read the current configuration in the ASM1000 and will display it on the screen As you make changes and accept the changes the new values are immediately sent to the connected ASM1000 and Sampling Heads If parame ters are changed while Sampling Heads are on line those parameters that affect the anal ysis will not be sent to the Sampling Heads until current count cycle ends and a new cycle begins Alarm Annunciation The first menu we ll look at is the Alarm menu which is used to assign
152. ill be programmed Host Interface 45M02 R5232 Testing of acute alarm during Perf Check Enabled No Cancel Figure 68 Summary of Program Options Is this correct Press Yes to continue No to change the selection or Cancel to exit the program 153 154 Host Computer Interface The configuration utility AsmLoad will be launched at this time The first screen Fig ure 69 is that of the serial port number and baud rate that will be used to download pa rameters ia Select Host Port xj Host Port Port Baud 115200 y cres Figure 69 Selecting the Host Port The highest baud rate should be fine for most computers Select a lower baud rate if your computer is very old or exhibits exceptionally slower responses Press Accept to con tinue or Cancel to exit The next screen Figure 70 is that of the configuration utility AsmLoad with selections preconfigured based on the selections made on the first screen Downloading Interface Parameters w AsmLoad ASM1000 Firmware Update Utility Installing ASMOZ Port About Help Exit target file Eimmwate gt Program Options TF Reload firmware C No Change Enable testing of mec C No Host Interface Sce diam V during S232 Host Intfce Performance Release device when Check El done RS485 Host Intfce completed Press Start to begin omte 115 2kb 7 12 2005 10 39 59 AM Figure 70 The Firmware Update Util
153. ime 53 System Operation 070c t94 L m_DACh Filter Perf Data Sys tem Change Check Revien Setup Figure 30 An Alarm Has Been Received from CAM 3 Maintenance This indicates that the sampling head has not yet completed a Per formance Check or Eficiency Calibration and still contains the source Note If you forgot to remove the source the sampling head will be in Maintenance Mode as indicated on the Network Display and will not resume auto counting until the source is removed Re moving the source will take the sampling head out of Maintenance Mode Log In and Log Out Now that we ve completed our tour of the Alpha Sentry CAM System we ll begin our discussion of how to use the system We ll start with the Access Code and System Secu rity logic that is built into the ASM1000 The Access Code The ASM1000 s Access Code System Security function is not fully enabled as shipped from the factory Though the Log In F5 key is present no log in is required for access to the system 54 Log In and Log Out System Security Since the Alpha Sentry CAM System is a safety related system it is not unreasonable to limit access to the ASM1000 s controls to only those people who have both a need and the proper training to use them Used this way the Access Code serves as a traditional password for access to the system The Access Codes and the functions which the holders of those codes will be permitted to perf
154. in minutes S is the previous net count rate in counts per minute and E 1s the percent error of the previous count rate Pu DAC hrs The plutonium exposure in DAC hrs is calculated as T Ap E ian T p Zpac K V 18 where Ap T is the plutonium net area from the measured spectrum with the collect end ing at time T T is the time since the filter was changed in hours T is the spectrum collect time in hours V is the volume of air in liters that has gone through the filter since it was last changed is the detector counting efficiency Zpac is the nuclide DAC factor in wCi em and 169 Algorithms K is the unit conversion factor to make the units match properly 1 332x10 h Alarm Logic The alarm logic consists of two levels of alarms 1 The acute release alarm calculated in the sampling head 2 The chronic release alarm calculated in the ASM1000 The Acute Alarm The acute alarm calculation is performed in the sampling head at every acute interval When the DAC Hr alarm method is in effect the calculation is based on the counts col lected within the last interval When the DAC alarm method is in effect the calculation is based on the difference between the counts collected within the last two intervals The acute alarm is TRUE if the number of counts in the Pu region exceeds the product of the acute alarm count limit and acute alarm limit multiplier AND R gt 2 19
155. in response to varying alarm conditions the details of which we ll be taking a close look at later in Handling Alarms on page 62 48 A Guided Tour Active LED This indicator will be illuminated whenever the ASM1000 is operating normally A blinking indicator indicates a potential service problem LCD Display A high resolution back lighted LCD display is used for all system status and data displays as well as for the setup dialog used to change system and or individual Sampling Head parameters The LCD display is backlit for easier viewing As shipped from the factory the back light will automatically shut off after 15 minutes have elapsed without any of the ASM1000 s keys being pressed This shutoff delay may be set longer or shorter at your facility since it can be changed by the System Manager when the system is installed and initially configured In the event of an alarm it will automatically turn back on and re main on Please note under normal operation when the backlight is off the display will be blank with nothing visible on the screen Press any key to activate the backlight and re store the display When the ASM1000 is first turned on you may see nothing on the screen for about twenty seconds while the system initializes itself Function Keypad Directly below the LCD display is the Function Keypad Five of the keys labeled F1 through F5 are soft keys That is their meaning changes depending upon the o
156. inally filter loading over time causes sample self absorption the sample itself will attenuate some of the alphas ES Pu Counts El 6 05 MeV Peak ES 7 68 MeV Peak E 8 78 MeV Peak oO e pi E s o de 150 Channel Figure 2 Radon Daughter Peak Tails These tails reach down into the energy region where we expect to see plutonium 5 15 to 5 5 MeV and uranium 4 6 to 4 8 MeV Therefore if we look at the Pu or U regions there are counts due to Pu or U as well as counts due to each of the three radon daughter peaks Since the three radon daughter peaks overlap we apply a multiplet stripping method to determine the counts associated with each peak This method differs from traditional deconvolution algorithms in that we use a model of the peak tail rather than a model of the peak itself to fit the data Each radon daughter peak is looked at in two components the tail and the peak itself 1 This represents the 6 00 MeV peak from Po Ra as well as the 6 05 MeV peak from Bi Ra Introduction The first step is to strip out the contribution to the spectrum of the highest energy radon daughter the 8 78 MeV peak At the first channel of interest Xy where the tail region begins to slope upwards in Figure 3 it is assumed that its contents are proportional to the sizes of the radon daughter peaks Figure 3 Experimentally Determined Valley Points in a Typical Spectrum We now look at a point
157. ing 3 When counting ends the ASM1000 will perform the Efficiency Test If the efficiency is within the allowable limits the CAM s Green LED will turn off for a moment and a PASS status message will be displayed If the efficiency is outside the allowable limits a FAIL status message will be displayed and the LEDs will change to Green Off and Red Blinking Checking System Performance 4 Ifthe optional Acute Test is enabled page 220 and if the test in Step 3 PASSed the ASM1000 will perform an Acute Alarm Test on the sampling head The status message will change to Testing Acute and the CAM s LEDs will change to Green Blinking and Red On If the sampling head reports on the Acute Alarm within a fixed time the status will change to Perf Acute Pass the LEDs will change to Green Blinking and Red Off and the annunciators currently selected for an Acute Release will be activated for several seconds at both the ASM1000 and the Head If the sampling head does not report the Acute Alarm within a fixed time the status will indicate Acute Fail Refer to Firmware Update and Acute Test Option on page 220 The Acute Test during the Performance Check if enabled is always performed using the DAC Hr alarm method regardless of the controller s setting The alarm method will revert to the controller s setting immediately following the Acute Test 5 At the end of the Performance Test the sampling head will be set to Green Off an
158. ing Be sure it is centered This is the white paper not the blue separator material 4 Press the top of the cartridge back onto the base Preparing the Network for the Change Once all of the cartridges are ready the next step is to tell the ASM1000 you want to en ter the Filter Change procedure This must be done at every filter change To do that press Filter Change F1 This will bring up a submenu showing Filter Change and Date Time Pressing F1 Filter Change again will yield the display shown in Figure 49 Filter Change Record CAM Last Change I 1 3 4 a 6 Y 8 19Ju196 14 47 139Ju1965 14 47 18Ju196 14 47 N A N A N A N A NA CAH Heads primed for Filter Change Figure 49 The Change Filter Display Each sampling head on the network is shown together with the date and time the filter was last changed and the descriptive ID for the Sampling Head If you press Cam Volume F2 instead the display will be similar to Figure 50 where Volume replaces Last Change Changing the Filter Filter Change Record 629538 65 61727 72 N A NA N A N A N A CAM Heads primed For Filter Change Can Uolune Figure 50 The CAM Volume Display In addition to generating these ASM1000 displays the filter change procedure also primes the Sampling Heads for the change This is indicated by the blinking Red LED on the side of the Sampling Head This tells you that though the
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160. integer format time stamp date for oldest entry date format time stamp time for oldest entry time format time stamp date for newest entry date format time stamp time for newest entry time format Note If there is no Data Base allocated for the requested CAM entries and all the other parameters return a value of zero 00 00 00 and 00 00 00 for date and time Read Trend Data Base Contents 32 This command reads a number of Trend Data Base entries starting at date and time for a particular sampling head 129 130 Command Size Parameter Response Size Parameter Host Computer Interface lt AAC gt lt 32 gt lt date gt lt cr gt lt time gt lt cr gt lt number gt lt cr gt lt checksum gt lt EOT gt 31 bytes AA RS 485 address hex of ASM1000 RS 232C 00 C CAM number 32 read data base block command date starting date date format time starting time time format number number of entries requested 50 max per re quest integer format lt entries gt lt cr gt lt fc date gt lt cr gt lt fc time gt lt cr gt lt ts date gt lt cr gt lt ts time gt lt cr gt lt info gt lt cr gt lt value 1 gt lt cr gt lt value 2 gt lt cr gt lt value 3 gt lt cr gt lt ts date gt lt cr gt lt ts time gt lt cr gt lt alarm gt lt cr gt lt value 1 gt lt cr gt lt value 2 gt lt cr gt lt value 3 gt lt cr gt lt checksum gt lt EOT gt 27 57 entries bytes
161. ints about running the Head by itself should be understood e The Green LED which indicates that the ASM1000 is communicating with the Head will blink until the ASM1000 puts the Head on line AUTO then will change from blinking to continuously on e The Green LED will turn off if the Head goes off line N A If communication is lost between the ASM1000 and the Head the ASM1000 will indicate a fault con dition and the Head will turn the Green LED off after a delay of 10 minutes e In Manual mode where data acquisition is controlled by the operator of the ASM1000 and no exposure alarms are generated the Green LED is turned on when the Head starts counting and turns off when the count stops If communica tion is lost between the ASM1000 and the Head the ASM1000 will indicate a fault condition and the Head will turn the Green LED off after a delay of 10 min utes e The Red LED illuminates on all alarms including door open alarms Please re member that the Head will not collect exposure data while the door is open e Annunciators which have the STOP ALARM button selected in the Annunciator Ta ble require the ASM1000 to stop the alarm It is recommended that the alarms be configured so that the STOP ALARM button is not used since this would require turning the unit off then on again to reset the alarm e The Acute Release calculation done by the Head when not connected to an ASM1000 uses the last Upper Energy Analysis Window and Acute A
162. istory Trend Data Review View Spectrum Data Review History Trend Cursor Detail Data Review History Trend CAM Data Review View Spectrum Last Count Cycle Data Review View Spectrum Last Alarm Data Review View Spectrum Current Data Review View Spectrum CAM System Setup Param Setup Alarms System Setup Param Setup Units System Setup Param Setup Communications System Setup Param Setup Miscellaneous System Setup CAM Control Auto Manual System Setup CAM Control Manual Start Stop System Setup CAM Control Manual Clear Data System Setup CAM Control Cam Status Table System Setup CAM Control View Spectrum System Setup Network Config Auto Configuration System Setup Network Config Add Cam System Setup Network Config Delete Cam 185 186 lt range gt Response checksum gt lt EOT gt 23 24 25 26 27 28 29 27 2B 2C Technical Reference System Setup Calib Efficiency System Setup Calib Air Flow System Setup Calib Diagnostic Test System Setup Calib Diagnostic Test Help System Setup Calib Diagnostic Test Lamp Check System Setup Calib Diagnostic Test Audio Check System Setup Calib Diagnostic Test Relay Check System Setup Calib Diagnostic Test Version Filter Change Date Time Filter Change Filter Change Two ASCII numeric character representing the hex value of the bitmap for the access level ranges to be assigned to this menu lt id gt The value for range can
163. it bitmap indicating which CAM s have detected a trouble alarm Bit set 1 indicates CAM has detected an alarm 8 bit bitmap indicating which CAM s have completed the analysis cycle and calculated data is available Bit set 1 indicates CAM has data available The data available flag can be reset by the Reset Data Available opcode E1h command the Read Limited Calcu lated Datal opcode 18h command or the Read Limited Calcu lated Data2 opcode 3Bh command 8 bit bitmap indicating which CAM s have entered a maintenance operation Bit set 1 indicates CAM in maintenance mode Mainte nance mode includes Performance Check Efficiency Calibration Filter Change and Flow Calibration Failure in a Performance Check operation will result in the CAM s bit set in the lt trou ble alarm gt field This command is identical to the Summary Alarm Status command described on page 111 The CAM s bit in the lt maint status gt bitmap will be set whenever a maintenance operation is entered and cleared when finished In addition the CAM s bit in the lt trou ble alarm gt bitmap will be set if the CAM s performance check operation fails Set Display Flag The SetDisplayFlag command is used to enable or disable the ASM1000 s dynamic dis play update Command lt address gt lt CAM gt lt E0 gt lt control gt lt cr gt lt checksum gt lt EOT gt 189 Technical Reference Parameters lt control gt Two ASCII numeric charac
164. ition Excessive Energy Calibration Shift Sampling Head Off line N consecutive No Counts cycles The Factory Default annunciation for each of these alarms is The Amber indicator on the top of the ASM1000 is illuminated The Slow Audio Alarm is activated The Trouble Relay Output is deactivated In the Network Display the CAM Display Box for the Sampling Head which de tected the alarm is changed to reverse video The alarm is entered into the ASM1000 s Alarm Log Pressing the STOP ALARM button will silence the audio output 25 Installation High Background The alarms in this class are the detection of an excessive background level Background so high that counting statistics make computing the set DAC hour limit calculations im possible at a Sampling Head When detected the Factory Default annunciation for this alarm is the use of reverse video for the CAM Display Box for the Sampling Head which detected the alarm Normally this alarm will not be stored in the Alarm Log because a period of high ambient background conditions could quickly fill up the log in a multi head system The CAM Sampling Head Annunciators The default settings for the annunciators on the Sampling Heads are summarized in Table 5 The following describes each type of alarm the events which can trigger it and the de fault annunciation Table 5 Sampling Head Annunciators Alarm 4 7 Exposure Trouble Conditions strobe Horn
165. ity Press Start button to begin the parameter download process The first thing that will hap pen is that the configuration utility will continuously attempt to synchronize with the ASM1000 A message will be displayed on its status bar with each attempt Next cycle power to the ASM1000 The startup process in the ASM1000 will invoke the corresponding download utility in the device and synchronize with the computer Once the download is complete and successful the following message will appear as shown in Figure 71 AsmLoad x Update complete Please restart 45M1000 Figure 71 Downloading is Completed 155 156 Host Computer Interface Following the download the ASM1000 will not be restarted automatically Cycle power to the ASM1000 for the new parameters to take effect When the install program is finished bring up the Communications Parameter Dialogue screen again and the appropriate Host Interface should be shown in the lower part of the LCD See Figure 63 RS 232C or Figure 64 RS 485 on page 145 Calibration A Algorithms This appendix lists and describes the Calibration Spectrum Analysis and Alarm Logic al gorithms used by the Alpha CAM System Calibration There are three types of calibration Energy Calibration Efficiency Calibration and Flow Calibration Energy Calibration The CAM System classifies detector events by energy using a 256 channel multichannel analyzer MCA which has a linear calib
166. ivity B 040010008 Energy 3 490 Mell Paran Source CAM He twork Setup Info Control Config Figure 61 The Source Parameters Screen This determines the preset MCA data acquisition time that is to be used for the Efficiency Calibration and the Performance Check The allowable range is from 0 to 899 9 minutes A successful Performance Check requires that the measured effi ciency be within a certain percentage above and below the cali brated efficiency of the sampling head This parameter determines the upper limit of an acceptable deviation and may range from 0 to 99 9 This parameter determines the lower limit of an acceptable devia tion and may range from 0 to 99 9 This parameter is used to specify the activity units in which the Per formance Check and the Efficiency Calibration Test Source activity will be entered To change the units use the HORIZ INDEX key to move the highlight to the desired units then press ENTER This parameter is the calibrated activity of the Test Source The units are as specified by the Units parameter This is the energy expressed in MeV of the source The accepted range is 0 to 9 99 MeV The default is 1Am at 5 49 MeV It is used to verify that The peak location hasn t shifted by more than five channels in an Efficiency Calibration Modifying the System s Parameters e The peak location hasn t shifted by more than five channels in a Performance Check Since this type of shif
167. l Mounting the ASM1000 The ASM1000 chassis is shipped in a configuration suitable for table top operation The tilt stand on the back of the ASM1000 can be used to tilt the unit for better viewing For wall mounting every ASM1000 is shipped with a set of mounting brackets Figure 9 To use these remove the four plastic feet and tilt stand Install the bracket on the rear of the ASM using the supplied screws The brackets for top and bottom are keyed so that the screws in the wall will lock in place securing the unit to the wall The wall fasteners are not supplied The wall fasteners and mounting surface combined must support at min imum four times the weight of the ASM1000 or approximately 17 kg 37 Ib Figure 9 The Wall Mount Bracket System Configuration For wall mounting it may be preferable to remove the line cord and bring the ac power through an electrical conduit An easily removable knockout plug on the chassis allows use of a standard 4 in electrician s wire coupling The standard line cord is easily re moved and your facility s ac supply cable can be attached to a terminal strip inside the ASM1000 Changing the ASM1000 s Power Wiring Follow these steps to change the ASM1000 s power wiring WARNING Live power wires can be lethal Be certain that the facility s A power wires are not carrying electricity before you work with them Remove the two Phillips head screws on either side of the chassis
168. larger than the other three valley points Since the model expects this point to be lower the model will break down Figure 7 shows this case Optimum X Xa too high Figure 7 Left Side of the TRU is Set Too High 10 Introduction For this reason it is recommended that you collect a few sample spectra yourself com pare them with the figures presented here and experiment with different settings to help you determine the optimum settings for your site The following table lists some recom mended default settings Nuclide of Upper Energy Analysis Window Interest Limit MeV MeV Pu 5 7 2 7 Pu 5 8 2 8 00m 5 8 2 8 ee Sy 4 7 17 Note that uranium requires that some default parameters be changed Refer to Parameters for Uranium on page 94 Automatic Energy Calibration Due to filter loading which causes attenuation the alpha peaks in the spectrum will tend to shift to lower energy This becomes more pronounced over time as the filter becomes more loaded Thus from the time a new filter is inserted until it is removed the peak lo cations are continuously changing This phenomenon affects all the peaks by approxi mately the same amount barring any instrument malfunction In order to properly apply the background stripping algorithm we keep track of the peak locations so that the radon daughter peaks can be stripped from the spectrum This is done automatically by the ASM1000 wi
169. larm mini mum count values entered by the user as defaults If none have been entered the factory defaults of 5 7 MeV Upper Energy 2 7 MeV Window and 80 counts will be used e The Head s alarm limits for air flow are fixed at less than 0 3 cfm and greater than 3 cfm External Setup 22 Now that you have physically installed your Alpha Sentry CAM Network the next step is to perform an external setup to establish the network s initial operating parameters Note that this process is not mandatory If the parameters factory default values dis cussed in detail in the next section are acceptable there is no need for an external setup If after reviewing the factory defaults you decide to perform an external setup a com patible PC or laptop with a standard RS 232C Serial Port and depending on the supplied software an appropriate media drive will be required We ll be covering the details of its use in Installing the Setup Software on page 29 The Factory Defaults When the ASM1000 is first turned on you will see nothing on the screen for a few sec onds while the system tests itself The Factory Defaults There are four major categories of parameters associated with an Alpha Sentry CAM Network e Alarm Annunciators e Security e CAM IDs e Alarm Parameters In this section we ll be looking at the factory default settings for those parameters Alarm Annunciation Defaults This set of parameters deter
170. lay contacts rated at 0 3 A 30 V ac Relay Element Trouble No Alarm Trouble Alarm Trouble Common Exposure Alarm Exposure No Alarm Exposure Common shown in power off condition 237 Maintenance Sampling Head J101 CAM Network 9 pin Male D with threaded inserts Pin Signal Description Ground 1D1 In Ground Network Ground 470 Q to chassis RS 485 Serial Data Line B bi directional ID2 In IDO In Ground o o N O aA Bb OO DNDN RS 485 Serial Data Line A bi directional Shield Chassis IDO ID1 and ID2 are inputs that determine the Head s Net work Address These would normally be selected with the CA2000 Network Tee Box but the input connector could be hardwired with the code If the address of the CAM is specified through the CA2000 Network Tee Box then the cable that connects the Tee Box to the CAM heads must supply the ID1 ID2 and ID3 address pins 238 Connectors and Signals CAM Address Wiring CAM Address IDO 1 Open Gnd Open Gnd Open Gnd Open Oo N O aA A WO DD Gnd J102 CAM Power 3 pin DIN Female Pin Signal Description 1 24 V ac 1 In 2 100 Q to Chassis 3 24 V ac 2 In Shield Chassis 1D1 Open Open Gnd Gnd Open Open Gnd Gnd 19 2 to 26 V ac Maximum load less than 15 W ID2 Open Open Open Open Gnd Gnd Gnd Gnd 239 240 Alarms Maintenance 6 position Terminal Board Terminal 4
171. ld you attempt an illogical or invalid operation a warning message will be displayed Press CLEAR to acknowledge the message A Guided Tour Left and Located on the 4 and 6 keys respectively the LEFT ARROW Right and RIGHT ARROW keys are used to move a data cursor about when Arrows viewing Trend Data The specifics on how this is done will be cov ered later in History Trends on page 74 At all other times these keys have their standard numeric meaning ASM1000 Connectors All of the ASM1000 s connectors are located on the left side of the unit as shown in Fig ure 26 Since there is normally no need to use these connectors except during system in stallation only a brief description will be given For further details refer to Chapter 2 Installation WARNING RISK OF FIRE 4103 HOST INTERFACE J104 CAM POWER 250V 1 2A SB REPLACE FUSE WITH SAME TYPE AND RATING 8 o 1 1 J101 CAM NETWORK J102 RS232 Figure 26 The ASM1000 Connectors J101 CAM NETWORK This is the ASM1000 s connection to the multi drop RS 485 CAM Network J102 RS232 This connector is used to attach the ASM1000 to a PC for loading new firmware and for external PC setup In addition it may also be used to connect an optional local printer to the ASM1000 J103 HOST INTERFACE This connector will only be present if the optional Model ASMO1 or ASMO2 Host Com puter Interface is installed When present it i
172. lds a data base of the parameters which are being measured The data base can contain more than 1200 entries which are allocated evenly among all of the sampling heads connected to the network At the completion of every counting cycle an entry is added to each sampling head s al located data base memory Each entry includes e The count rate CPM that was measured during the counting cycle e The current Air Flow volume since the last filter change e The Percent Error of the count rate These values are used to calculate the Flow Rate the Concentration and the DAC hrs Just as in the case of the Alarm Log when the data base capacity is exceeded each new entry that is added causes the oldest entry to be deleted To view the data stored in the data base press Data Review F3 then Hist Trends F1 This will take you to the screen shown in Figure 39 which is the History Trend Display Selecting the Sampling Head to View At the top of the screen you ll see the number of the sampling head whose data is cur rently being displayed To select a different sampling head press CAM F4 then type the number of the desired sampling head followed by ENTER in response to the dialog box which pops up The Trend Graph for the new sampling head will then be displayed Selecting the Data Type At the left side of the Trend Graph you ll find the label for the Y axis of the graph In the example in Figure 39 it is the DAC hour values
173. ll remain active until the STOP ALARM is pressed Note that the Red LED on the Head illuminates for any alarm condition and remains lit until the condition clears Viewing System Data 68 Once an alarm has been acknowledged the functions we Il be discussing in this section are used to investigate the cause of the alarm and the conditions which led up to it The Detailed Display The first place to look for information about an Alarm is the Detailed Display which is reached by pressing the DETAILED DISPLAY key on the ASM1000 When you do that if you have multiple sampling heads on your network a dialog box will pop up to allow you to select the sampling head whose details you want to view Press a digit key from 1 through 8 followed by ENTER to select the sampling head Note that if only a single sampling head is connected to the ASM1000 this step is not required and this dialog box is not displayed Viewing System Data Interpreting the Display When you press DETAILED DISPLAY you 1l usually see Figure 35 the normal display CAM 1 Detailed Display B Conc C uCirsmL CPH Airy Flow cfm Alarm Count Cycle min Serial BS92601P Last Filter Change 285ep9e 11 46 Effney Cal Date 21f8ep9e B B A Air Flow Cal Date B95ep92 Flow DAChr Filter Perf Data System Log Change Check Review Setup In Figure 35 The Normal Detailed Display If the sampling head is currently generating an alarm you ll
174. loading drift etc It can be verified periodically during the Performance Check Function While primarily checking the efficiency of the detector the location of the reference peak is also found Excessive shift is signaled by the posting of an error message in the Status field Peak Shift Error The default energy assumes a 241 Am source 5 49 MeV but the Source Info menu allows other sources with a different peak energy to be used as the check source Efficiency Calibration To accurately compute the amount of activity that is being detected by a given sampling head the ASM1000 needs to know the detection efficiency of the Sampling Head The process for measuring that efficiency is called Efficiency Calibration All heads shipped from the factory have been calibrated with the parameters and date stored in non volatile memory in the sampling head s MCA The calibration procedure should be performed e After cleaning or replacing the sampling head s PIPS detector 193 194 Maintenance e After adjusting the sampling head s detector bias supply or performing any main tenance on the sampling head s preamplifier or MCA electronics e Ifthe Performance Check alerts you to an error In this section we ll go through the Efficiency Calibration procedure step by step What You Need to Do First To perform an Efficiency Calibration you ll need a test source such as the Model ASO80 241 Am source for a 450 mm detector
175. lue is 80 Refer to Acute Release De termination on page 7 for an explanation Installing the Setup Software Number of Consecutive No Counts If at the completion of a counting cycle there are absolutely no counts in the transuranic portion of a sampling head s spectrum this can be due to e Extremely low ambient background e Extremely well filtered local air e A fault in the sampling head Should n consecutive No Counts conditions be detected for a given sampling head a Instrument Fault class alarm is issued The Factory Default value for n is 4 which can be changed for each sampling head to reflect its local environment Installing the Setup Software The following procedures are used to install the Model 578 Alpha Sentry PC Setup soft ware and connect your PC to the ASM1000 They assume that you have already installed your Alpha Sentry CAM Network as described in System Configuration starting on page 12 In addition the installation procedures outlined here assume a working familiar ity with PCs and the Windows operating system The Software If the S578 Alpha Sentry PC Setup software has already been installed you can skip ahead to the next section The ASM1000 Connection As with most software installations entries to the system registry will be required Be sure that you have administrator privileges before attempting to install the software Insert the distribution media containing t
176. ly back into position in the Detector Shield Can Make sure the detector O Ring in the base of the can is not damaged and is in the proper position see Figure 81 219 Maintenance 6 Align and tighten securely the three screws holding the sub assembly to the Detector Shield Can Firmware Update and Acute Test Option The application program that runs the ASM1000 is stored in a local compact flash card on the CPU board The memory is non volatile that is the code stored in compact flash is retained when power is removed But in contrast to other types of memory the pro gram can be changed in circuit if required Canberra offers the Model S579 Alpha Sentry Configuration and Firmware Update Soft ware which allows you to enable or disable the Acute Test function reconfigure your op tional host interface and update your ASM1000 firmware to the current version It includes the tools necessary to update your system For firmware updates the embedded application program that runs in the ASM1000 is typically supplied on separate media To run the S579 you will need an industry standard PC running MS Windows operating system equipped with a suitable media drive and a 9 pin RS 232 serial port Installing the Model S579 To install the Model S579 Configuration and Firmware Update software please refer to the Installing the Configuration and Firmware Upgrade Software on page 151 Firmware Update The Model S579 software communicates wit
177. m Option is installed on your sampling head you ll have to re move it to prevent damage during repositioning of the ASO10 If the ASO20 Alarm Option is not installed on your sampling head go to Removing the Seal Ring on page 226 1 Disconnect power to the sampling head Remove the connection to the sampling pipe by loosening the plastic nut on the Manifold intake pipe The Adapter Pipe can now be separated from the Manifold Remove the three screws holding the sampling head top cover on the sampling head Remove the three pan head screws which secure the AS020 Alarm Assembly to the sampling head top cover Firmly grasp the body of the 8 pin connector for the alarm wire harness and disconnect it from the Alarm Assembly printed circuit board Set the Alarm Assembly to one side Slide this connector through the opening in the sampling head top cover and remove the top cover To provide a flat surface for the clamp to operate on reinstall the top cover on the sampling head Be sure that the Spacer is between the cover and the Manifold Torque the screws to 6 inch pounds 0 7 newton meter A CAUTION Use a maximum of 6 inch pounds 0 7 newton meter of torque Excessive force can crack the plastic 225 Maintenance Removing the Seal Ring This section tells you how to remove the metal Air Intake Seal Ring shown in Figure 85 226 AIR INTAKE SEAL RING INTAKE SEE me DETAIL lin O RING AGAINST SHOULDER
178. meters Pressing the Units F2 key brings up the display in Figure 57 which is used to select the data units that will be used by the ASM1000 Units Parameters ir Flow METE Lmin Eerorted Concentration Activ aci pci dpm Eq kBx ugl Uolum cms m 3 L ALY ugl Enrichment weight 3 6 76 Alarm Setup Units Commun Figure 57 The Units Parameters Screen The selection follows these general rules e The currently selected units are shown inside parentheses e The VERT INDEX key is used to move down the screen from one category to the next e The HORIZ INDEX key is used to move across the choices for any given category e When the highlight is resting upon the units of choice pressing ENTER will change the units to the current selection At that time the parentheses will be removed from the previous selection 97 System Operation The choices are defined below Air Flow The choice for the measuring and reporting units for air flow is be tween cfm cubic feet per minute and L m liters per minute Activity Radioactivity measurements and results may be made and dis played in your choice of uCi microcuries pCi picocuries dpm disintegrations per minute Bq becquerels kBq kilobecquerels or ugU micrograms of Uranium Volume All activity is reported on an activity per unit volume basis The choices for the measurement units for the volume are cm cubic centimeters m cubic meters L liters
179. mines the type of annunciation that will be used to indicate the various alarm conditions that the system can detect In addition for each alarm type you can determine whether or not the alarm will be entered into the Alarm Log The ASM1000 Annunciators The default settings for the annunciators on the ASM1000 are summarized in Table 4 The following paragraphs describe each type of alarm the events which can trigger it and the default annunciation 23 24 Installation Table 4 ASM1000 Annunciators Alarm Red Amber Exposure Trouble Alarm Log Condition Lamp Lamp Horn Relay Relay screen Entry Acate x Fast X x X Release Clone x Fast xX x x Release High x Background Instrument X Slow X x X Fault Stop Alarm Button x Me Acute Release This class has only one possible cause the detection of an Acute Release by a CAM Sampling Head It is triggered when the Sampling Head senses a rapid in crease in the net count rate counts above background in the spectrum that is be ing collected For details on the algorithm used refer to Alarm Logic on page 170 The Factory Default annunciation for this alarm is The Red indicator on the top of the ASM1000 is illuminated The Fast Audio Alarm Output is activated at the ASM1000 The Exposure Relay Output is activated In the Network Display the CAM Display Box for the Sampling Head which de tected the alarm is changed to reverse video
180. n 160 um diameter holes in 50 um thick stainless steel are such that under the recommended air flow rates there is a very high probability that the unattached radon progeny will collide with and be adsorbed by the in ner surface of the passages through the screen Plutonium and uranium particulates as well as attached radon progeny are much larger on average than unattached progeny between 1 um and 10 um Because of their larger size and greater mass their paths through the air are less Brownian in nature and can be described as more ballistic In addition to being larger these particulates are less chemically reactive than unattached progeny and thus less likely to collide with and be adsorbed by the inner surface of the holes in the screen All particulates that pass through the screen are collected on the filter Since attached radon progeny that deposit on the filter can interfere with the detection and analysis of airborne plutonium or uranium particulates a sophisticated algorithm is used to analyze the spectrum and compensate for the background due to radon progeny There are times when one may consider operating the Alpha Sentry CAM sampling heads without the radon rejection screen in place This can be an acceptable mode of op eration in some situations since any radon progeny attached or unattached that deposit on the filter medium are dealt with by the background compensation algorithm This mode of operation can be considere
181. n a timely fashion Note The receiver buffer on the Host end should be at least 3000 bytes in order to han dle the largest response Read Spectral Data on page 131 The Read Trend Data Base is of variable length but the block size is under the Host s control therefore the receiver buffer may want to be larger 1f the Host software wants to read larger blocks of data Normal Response Protocol The normal response is returned when the ASM1000 is not busy and there are no errors encountered in processing the command Syntax lt data gt lt cr gt lt checksum gt lt EOT gt Parameter 1 char Normal response start character data nchar Data field consisting of a varying number of characters checksum 2 char Response string checksum Checksum on page 110 EOT l char End of Transmission character EOT 04 Error Response Protocol The error response is returned when an error is encountered during the processing of the command Syntax lt error gt lt cr gt lt param gt lt cr gt lt checksum gt lt EOT gt Parameter 1 char Error response start character error l char E bad command etc C checksum error R parameter range error H sampling head not available T invalid parameter 109 Host Computer Interface param l char Parameter number with a R range error checksum 2 char Response string checksum Checksum on page 110 EOT 1 char End of Transmission character EOT
182. n either direction to align the holes with the three standoffs Slide the Assembly into position while taking care not to pinch a wire in the cable then reinstall the screws Note that on later units a base plate with mounting feet is at the bottom of the MCA Assembly System Configuration Alpha Sentry Configuration Guide Case A Single CAM Head located lt 25 ft from ASM1000 AS020 Alarm Package Optional ASM01 ASMO02 ne ASXXXXX ost Comp Interface LASM1000 J CAM Head Case B Single CAM Head located gt 25 ft from ASM1000 CA2000 NTB CA2001 C2000 X _ Network Teminator ASM01 ASMO2 Included w CA2000 Optional C2002 X 10 ft included w CA2000 Host Comp Tasm1o00 Interface AS020 Alarm Pkg Optional AS070 Power Supply ASXXXXX CAM Head For distances less than 150 ft the C2003 X cable can be substituted Case C Multiple CAM Heads CA2000 CA2000 CA2000 NTB CA2001 7 Network Teminator oT Included w CA2000 Host Comp ASM1000 Interface AS020 7 Alarm Pkg Optional ASXXXXX ASXXXXX CAM Head CAM Head Figure 8 Typical System Configurations 13 14 Installation Wall Mounting the Units Both the ASM1000 and the Sampling Head are factory configured for table top use Ei ther or both can be mounted on a wall as described in the following two subsections If you don t plan to mount either of the units on the wall at this time go on to Communi cations on page 17 Wal
183. n the Normal Response Busy Response Syntax lt cr gt lt checksum gt lt EOT gt Busy response start character 40h The checksum and EOT fields are identical to those in the Normal Response Upon receiving a Busy response the host should retry the command Setup Interface Commands and Responses Set Alarm Template The SetAlarmTemplate command sets the alarm table bit in the lt device gt parameter for alarm lt class gt parameter to either ON or OFF as dictated by the lt control gt parameter If any CAM bits are set in lt device gt 0100 4000 hex the command will propagate to all on line CAMs as well The annunciator alarm template is always retained in non volatile RAM Refer to Types of Alarms on page 65 for a description of the various types of alarms and alarm classes Command lt address gt lt CAM gt lt A0 gt lt data gt lt cr gt lt checksum gt lt EOT gt 174 Setup Interface Commands and Responses Parameters lt data gt lt device gt lt device gt lt cr gt lt class gt lt cr gt lt control gt lt cr gt four ASCII alphanumeric characters each within the range 0 9 and A F representing the hex value of the logic OR bitmap of alarm annunciators as follows 0001 0002 0004 0008 0010 0020 0040 0080 0100 0200 0400 0800 1000 2000 4000 8000 lt class gt ASM red light ASM yellow light ASM audio loud ASM audio soft ASM r
184. ne the tail due to the 8 78 MeV peak by substituting X3 Y 3 ay Xo and Y 0 8 75 into Equation 5 and solving for the coefficients mg 7g and bg 7g If we now subtract the contribution of the 8 78 MeV peak from the spectrum channel by channel the process can be repeated for the 7 68 and 6 05 MeV peaks The Pu net area is defined as the remainder after the other peaks have been subtracted that is X l Ap gt Y e elmsrXi bsnl _ exi Dog _ elimeas it beos y 8 i X In essence the Pu net area is represented by Xl Ap gt Y Tga Tres Toos 9 i X where the T s represent the tail integrals for each of the background peaks from Xy to X 1 In principle the tail integrals represent a Poisson distributed quantity and the un certainty estimate for the plutonium area would be expressed as Di JA pa 2 T 558 2T 59 2T 595 10 However to be conservative and since the tail integral from Xy to X 1 is typically far less than half of the total net area of the background peak we can substitute the total net area of the peaks into Equation 10 This results in a plutonium net area uncertainty esti mate of Oi Ap Nor Nog N 11 6 05 where Spectrum Analysis Ns 78 is the net area of the 8 78 MeV peak that is the integral of its tail from XQ to X3 1 plus the sum of raw data from Xy to Xy N 6g is the net area of the 7 68 MeV peak that is the integral of its tail from Xy to X 1 plus t
185. ne through the filter since it was last changed p is the detector counting efficiency and Kxxx is the unit conversion factor to make the concentration be reported in the de sired units as shown in Table 13 167 Table 13 Conversion Factors Desired Output Units Ko Units of K uCi em 1 332x10 cm h Ci L uCi m 1 332x10 meh uCi L uCi L 1 332 x 10 1 h uCi pCi cm 1 332x10 cm h pCi L pCi m 1 332x 10 m h pCi L pCi L 1332 10 1 h pCi dpm cm 6 0 x10 cm h dpm L dpm m 6 0 x 10 m h dpm L dpm L 6 0x10 1 h dpm Bq cm 3 6x10 cm h Bq L Bq m 3 6 10 m h Bq L Bq L 3 6x10 1 h Bq kBq cm 3 6x10 cm h kBq L kBa m 3 6 x10 m h kBq L kBq L 3 6x10 1 h kBq ug U em Note 1 cm h ug U L ug U m Note 1 m h ug U L ug U L Note 1 1 h ug U Note 1 The value of K in this table for conversions to ug U per cm and m multiply the values for uCi per cm I and m respectively by 1 2 16x 107 5 3 36x 107 19 E where E is uranium enrichment in weight percent 168 Algorithms Spectrum Analysis The percent uncertainty of the concentration is calculated as follows t S EJ T S Eny zg M s LS 17 where t is the current actual cycle time in minutes S is the current net count rate in counts per minute E is the percent error of the current count rate ta 1s the previous actual cycle time
186. ng atthe Data outra daa BS Re Ae dee ee eS 73 History TrendS cosce e megk bee beac e Cee REL OE ORL we EERE OES 74 Selecting the Sampling Head to View 2 2 2 00 20 e 74 Selecting the Data TYPE 4 2 4 62d a6 022 2S ea wa Deh a ede eee enh ee eee 74 Viewing the Trend Data s oee coe poeci sa aeda ay neu Ep e e A E eee 76 Viewing the Detail Data gos s aice eb ra e OR di a A A 77 Controlling a Sampling Head gt si e sec ee 78 Selecting the Sampling Head suda e w ee 79 Sampling Head Operations 4 s s s ea ee ee Se GE ee A a a 80 Viewing the Spectra oe qose aa teru ee 80 Manual Start Stop s e e a4 a a Sew 4a a Baie OES be he a 81 Manual Clear Data eis son ae bee GO ea he a a a a aahi a 81 Returning the Sampling Head to the Network o e e 81 Chansins the Pater empre is at Ur erat saat we e ee hn ae Pe ae ea as Ga eee E 82 Preparing the New Filter Cartridges gt o oe scesa aeaea ee 82 Preparing the Network for the Change 2 2 2 2 00 000000 2 2 eee eee 84 Changing the Filter Cartridges es escau e 85 Returning the System to Service cbe peta EEEREN a 87 Setting the Date and Time e 87 Checking System Performance 88 Preparing the CAM Network for the Test 0 o e 89 The Performance Test ea ee eae Eee ae a e a NR 90 Returning the System to Servicen sses wie ee 92 Modifying the System s Parameters aa a a a a e a O oa 93
187. ng paragraphs are notices required by Federal Communications Commission FCC rules Part 15 Subpart A The user is cautioned that any changes or modifications not expressly ap proved by the party responsible for compliance could void the user s author ity to operate the equipment NOTE This equipment has been tested and found to comply with the limits for a class A digital Device pursuant to Part 15 of the FCC Rules These lim its are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment This equip ment generates uses and can radiate radio frequency energy and if not in stalled and used in accordance with the instruction manual may cause harmful interference to radio communications Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense 249 250 Notes FCC Notices Index A C Access code Chans iniae a EE EE EEEN 56 Factory default epar csepreronar esre inek 54 Acute release alarm ASMIDOO 066 aria wat anea 24 Sampling head 0 0004 26 Acute test A O ciao EN oes 220 PEL OTIAS pegeit Vos aha ies etek pak 90 AIP HOW or a A wae br ew ds 19 Alarm Acute calculation of 170 Chronic calculation of 170 ConnecttOns 4 s 405 6 edd la Se BES 19 Handling oy
188. ng the LCD These materials are highly resistant to normal cleaning materials 213 Maintenance Sampling Head The nature of the ASM s application requires that the Sampling Head s air path be occa sionally cleaned and decontaminated Changing the Filter Canberra recommends changing the Sampling Head s filter once a week as described in Changing the Filter on page 82 The remaining cleaning procedures require taking the Sampling Head out of service and disconnecting power Cleaning the Rejection Screen The Sampling Head s Rejection Screen can be easily removed by sliding it out of its re taining grooves If you have the Model ASO10 In Line Manifold option you will have to remove it to gain access to the Rejection Screen and the upper air path You won t need to remove it if you are servicing the preamplifier the amplifier or the detector The Rejection Screen is made of stainless steel and should be resistant to most cleaning solvents If it becomes contaminated and cannot be cleaned replacement screens are available from Canberra as Model AS060 two screens With the screen removed the major area of dust build up is exposed in the upper air in take housing The air is pulled through the screen and down through the small holes The housing is constructed from ABS plastic which is unaffected by aqueous media includ ing hot and cold water detergents weak and strong acids and bases and can therefore be cle
189. nks on the cover should be oriented so that they face the ASO20 Alarm Assembly Press the connector firmly into its mate on the printed circuit board in the AS020 Alarm Assembly Note that the connector is keyed for proper orientation Reattach the sampling head s top cover to the ASO20 Alarm Assembly using its three pan head screws The holes in the cover align with the standoffs in the assembly in one position only Attach the sampling head s top cover to the sampling head using the three supplied 6 32 x 3 flat head screws Torque the screws to 6 inch pounds 0 7 newton meter CAUTION Use a maximum of 6 inch pounds 0 7 newton meter of torque Excessive force can crack the plastic Connectors and Signals Connectors and Signals This section describes all of the ASM1000 s and Sampling Head s Connectors and Sig nals ASM1000 J101 CAM Network 9 pin Male D with threaded inserts Pin Signal Description Ground No connection Ground Network Ground 470 Q to ASM1000 chassis RS 485 Serial Data Line B bi directional No connection No connection Ground o 0 N O aA A O N RS 485 Serial Data Line A bi directional Shield Chassis 120 Q termination across B to A36 6 233 234 J102 RS 232 Maintenance 25 Pin Male D with threaded inserts Setup Printer or Update Port Pin o N O 0 A O N 20 Signal Description Ground Transmit Data Out Receive Data In Request to Send Clea
190. nunciator alarm template is always retained in non volatile RAM Command lt address gt lt CAM gt lt B0 gt lt data gt lt cr gt lt checksum gt lt EOT gt Parameters lt data gt lt device gt lt class gt Note There is no lt cr gt separator between the lt device gt and lt class gt fields Response lt status gt lt cr gt lt checksum gt lt EOT gt lt device gt Same as SetAlarmTemplate command lt class gt Same as SetAlarmTemplate command lt status gt Single ASCII alphanumeric character where 1 indicates ON 0 indicates OFF Example To read the alarm log entry status for the high background class alarms the values for lt device gt and lt class gt in the command and lt status gt in the response are as follows lt device gt 0040 selects alarm log lt class gt 02 selects high background class Assuming address is 01 and CAM is 1 the actual command string would consist of 15 characters and the response of 6 characters The contents would be as follows Command 011B00040025A 04 Response O OD 6A 04 The value returned in lt status gt is O indicating the bit is OFF 177 178 Technical Reference For clarity non printing characters are shown as hh where hh is their hex value Set Variable The SetVariable command sets the specified variable to the specified value Variables are identified through a variable ID Command lt address gt lt CAM gt lt C3 gt lt id
191. on rejection screen is not becoming clogged If it appears to be collect ing too much dust clean it more often or simply operate without the screen If your environment is very dusty you may have a small fraction of unattached radon daughters hence the screen s principles do not apply Refer to the Theory of Operation on page 2 for an explanation of how the screen removes radon daughters Biannual Preventive Maintenance Every six months the unit s flow calibration should be checked and its energy calibration recalibrated Flow Calibration Verification Use several points within the five point flow calibration range to verify that it is still valid Recalibrate if necessary Efficiency Calibration Recalibrate the system s efficiency using an appropriate calibration source Canberra Model ASO80 for 450 PIPS or ASO85 for 1700 PIPS is recommended Note Efficiency Performance Checks should be performed on a weekly basis If any such check indicates a significant change in efficiency greater than 10 the unit should be serviced The ASM1000 will continue to use the efficiency value deter mined in the last Efficiency Calibration Energy Calibration Verification The Performance Check also verifies energy calibration If an error is reported the Head should be serviced 208 Preventive Maintenance Annual Preventive Maintenance For continued reliable operation the unit s air flow path alarm filter drawer lif
192. on to ASM1000 ASM1000 RS 232 for PC setup or serial printer and RS 485 for communication to sampling head standard second port optional via Host Computer Interface Model ASMO1 RS 485 Multi Drop or Model ASM02 RS 232 Physical Weight Sampling Head 3 6 kg 8 Ib ASM1000 4 2 kg 9 3 Ib Sampling Head Diameter of head 17 8 cm 7 in diameter including vacuum connec tion and door knob 22 9 cm 9 in height 30 5 cm 12 in ASM1000 31 8 cm 12 5 in high 21 6 cm 8 5 in wide 8 9 cm 3 5 in deep with no mounting hardware 10 36 cm 4 08 in deep with feet or 9 60 cm 3 78 in deep with mounting bracket Vacuum Connection Male for 9 5 mm in ID hose Power Sampling Head 24 V ac 50 60 Hz lt 15 W ASM1000 100 130Vac 60 Hz 40 W Fuse 250 V ac Slow Blow Environmental Temperature Range e Sampling Head 0 to 55 C e ASM1000 0 to 55 C 243 Table 14 RFI EMI Susceptibility of Sampling Heads Test Condition AS1700R Standard Electric Fields ANSI N42 17B Step 7 1 2 2 30 to 35 MHz sweep Vertical gt 100 V m Horizontal gt 100 V m RF Field ANSI N42 17B Step 7 1 2 3 140 MHz Vertical gt 100 V m Horizontal gt 100 V m Microwave Field ANSI N42 17B Step 7 2 915 MHz Vertical gt 200 V m Horizontal gt 200 V m Microwave Field ANSI N42 17B Step 7 2 2450 MHz Vertical gt 200 V m Horizontal gt 200 V m
193. onnel who are allowed to access all menu functions These personnel will be assigned Access Levels through 4 respectively so that we have e Access Level One Filter Changes and Performance Checks 35 36 Installation e Access Level Two System Calibrations e Access Level Three Data Review e Access Level Four All Menus It is important to note that the Access Levels do not necessarily progress in authorization according to number it depends on how you set up your system As we ll see each menu function may be assigned up to four Access Levels Just because Level One is au thorized to perform a filter change doesn t mean that Level Two is also the filter change menu would have to be assigned to both levels One and Two for both of them to be able to access it The next task in designing your Security System is to assign Access Codes passwords to each of the Access Levels Each Access Level can either have a single code assigned to it or a range of codes For instance if there are many personnel who will be changing filters you may want to assign multiple access codes to Access Level One The range of codes for any level cannot overlap those of another level You may choose the code length while specifying the code or range of codes For our ex ample we ll assign three digit codes to our Access Levels as follows e Access Level One 100 199 range of codes e Access Level Two 650 699 range of codes e A
194. ontrol Changing the Filter The most common maintenance item for the Alpha Sentry CAM System is the changing of the filters in the sampling heads This is usually done on a weekly basis often at the same time as the Performance Check see Checking System Performance on page 88 In addition if either an Acute or a Chronic Release is detected the normal procedure is to change the filter at that time so the filter containing the release deposit can be further analyzed Note For proper operation the 450 cartridge must be used only in an AS450 Sampling Head and the 1700 cartridge must be used only in an AS1700 Sampling Head Preparing the New Filter Cartridges The first step is to prepare a new set of filter cartridges one for each Sampling Head that is to have its filter changed as follows 82 Changing the Filter 1 Referring to Figure 47 grip the top and bottom of an assembled filter cartridge by the serrated rims then twist and pull the two sections apart Figure 47 Removing the Top of the Filter Cartridge 2 Be sure that the white plastic filter backing is fixed in place in the base of the filter cartridge as shown in Figure 48 The side marked with a black X is the top the bottom is mounted against three plastic posts in the cartridge base 450 Cartridge Figure 48 The Filter Backing in the Cartridge Base 83 84 System Operation 3 Place a piece of 47 mm filter paper on top of the filter back
195. or Model AS085 source for a 1700 mm detector These sources are built into a red filter cartridge Note that the source that you use must be the same source that will be used for making the periodic Performance Checks de scribed in Checking System Performance on page 88 or you must remember to change the Source Information before a Performance Check with a different source Yov ll also need a freshly prepared standard black filter cartridge for each sampling head which is to be calibrated For information on preparing a fresh filter cartridge refer to Preparing the New Filter Cartridge on page 82 Preparing the ASM1000 for the Efficiency Calibration Before you can begin the actual Efficiency Calibration process you must first enter the source information into the ASM1000 Use the Source Info screen described in Source Information on page 103 to enter the following parameters 1 The counting time that you wish to use for the Efficiency Calibration 2 The activity units in which the calibration source is calibrated in for instance dpm or uCi 3 The activity of the calibration source Once that has been done you re ready to perform an Efficiency Calibration Preparing the Network for Efficiency Calibration From either the Network Display or Detailed Display press System Setup F4 Calib FS then Effney F1 This will take you to the Efficiency Calibration display shown in Figure 74 In the upper
196. or equipment either repair or replace the software or equipment or B in the case of defective services reperform such services LIMITATIONS EXCEPT AS SET FORTH HEREIN NO OTHER WARRANTIES OR REMEDIES WHETHER STATUTORY WRITTEN ORAL EXPRESSED IMPLIED INCLUDING WITHOUT LIMITATION THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OR OTHERWISE SHALL APPLY IN NO EVENT SHALL CANBERRA HAVE ANY LIABILITY FOR ANY SPECIAL EXEMPLARY PUNITIVE INDIRECT OR CONSEQUENTIAL LOSSES OR DAMAGES OF ANY NATURE WHATSOEVER WHETHER AS A RESULT OF BREACH OF CONTRACT TORT LIABILITY INCLUDING NEGLIGENCE STRICT LIABILITY OR OTHERWISE REPAIR OR REPLACEMENT OF THE SOFTWARE OR EQUIPMENT DURING THE APPLICABLE WARRANTY PERIOD AT CANBERRA S COST OR IN THE CASE OF DEFECTIVE SERVICES REPERFORMANCE AT CANBERRA S COST IS YOUR SOLE AND EXCLUSIVE REMEDY UNDER THIS WARRANTY EXCLUSIONS Our warranty does not cover damage to equipment which has been altered or modified without our written permission or damage which has been caused by abuse misuse accident neglect or unusual physical or electrical stress as determined by our Service Personnel We are under no obligation to provide warranty service if adjustment or repair is required because of damage caused by other than ordinary use or if the equipment is serviced or repaired or if an attempt is made to service or repair the equipment by other than our Service Personnel without our prior appro
197. or this alarm is the use of reverse video for the CAM Display Box for the Sampling Head which detected the alarm Normally this alarm will not be stored in the Alarm Log for a night of high ambient background conditions could quickly fill up the log in a multi head system In the default condition there will be no annunciator activated at the sampling head from this alarm class Handling Alarms Instrument Fault Each Sampling Head continuously measures various internal parameters These values are sent to the ASM1000 where they are tested to verify that the sampling head is operat ing properly Some of the Instrument Faults will generate a specific entry in the Alarm Log including e Low Air Flow e High Air Flow e Detector Bias Supply Power Failure e Door Open e No Data Acquisition Excessive Energy Calibration Shift Sampling Head Off Line e N consecutive No Count Cycles Other instrument faults will simply be logged as a number in the Alarm Log A list of alarm messages and their causes will be found in Information and Error Messages starting on page 198 If the ASM1000 detects an Instrument Fault in a sampling head it will not check for chronic release until the fault is corrected Regardless of this condition however the sampling head can still set its Acute Alarm The Factory Default annunciation for these alarms is as follows At the ASM1000 1 The Amber indicator on the top of the ASM1000 is illuminate
198. orm are assigned by the System Manager Access Authority In addition to providing you with your Access Code the System Manager should have filled in the chart in Table 6 which shows you the functions you have access to and re fers to the section of the manual describing that function If you try to use a function which you don t have access to an Access Denied message will be displayed Press any key to acknowledge the message Table 6 Your System Access Authority Function Access Reference Log In Out Yes Pages 56 and 57 Network Display Yes Page 58 Detailed Display Yes Page 68 Stop Alarm Yes Page 68 Filter Change Page 82 Performance Check Page 88 Data Review History Trends Page 74 Alarm Log Page 71 View Spectrum Page 72 System Setup Parameters Page 93 Source Info Page 103 CAM Control Page 79 Network Configuration Page 58 Calibration Page 193 55 System Operation Changing the Access Code In order to change the Access Code setup and assign the access passwords the Initial Personal Computer setup procedures described in Chapter 2 Installation are used Logging In The ASM1000 Network Display in Figure 27 on page 52 is the screen that most installa tions will normally display while the system is performing its monitoring chores The Log In label above F5 tells you that the F5 key is currently assigned to the Log In function To log onto the system 1 Press F5 to see t
199. ormance Check or Efficiency Calibration functions Automatic Energy Recalibration Even though the sampling head spectrum has roughly a constant offset and conversion gain as the filter gets loaded with dust the peaks tend to shift from their original loca tions Except for an instrument malfunction this phenomenon affects all peaks by ap proximately the same amount Therefore the system automatically calculates a new energy calibration offset coefficient every time a spectrum is analyzed A default calibra tion is shipped with the units The procedure will re start with the factory defaults after each filter change 159 160 Table 11 Altitude vs Pressure Altitude Pressure in feet in inches of Hg 0 29 92 1000 28 86 2000 27 82 3000 26 81 4000 25 84 5000 24 89 6000 23 98 7000 23 09 8000 22 22 9000 21 38 10 000 20 58 11 000 19 79 12 000 19 03 13 000 18 29 14 000 17 57 15 000 16 88 Algorithms If the 7 68 MeV peak is found during the analysis the new offset coefficient is calculated based on the fixed gain and the new location However if the 7 68 MeV peak is not found or if the new offset is more than 10 different from the current offset coefficient the energy calibration remains unchanged A peak is considered found if there is a sum of three adjacent channels around the expected location of the peak where the three channel sum is at least 10 counts larger than the next largest s
200. ou can initiate the Automatic Configuration process again with the following procedure 1 Press System Setup F4 2 In the new series of soft keys press Network Config F4 3 Press Auto Config F1 The messages mentioned earlier will again be displayed as the network is scanned and the sampling heads are initialized If a sampling head that was on the network is now not found the message CA Mn not found Delete database will appear The default answer is no which gives you a chance to save the database in the event that the sampling head was not intentionally removed from the network This message will not appear if a CAM that is presently on line has detected an alarm condition Deleting the database of a CAM that has been removed from the system is generally a good idea because it reclaims the database storage for use by those CAMs that are presently on line If the sampling head is physically not present but its database has been retained it will be shown as N A dbase in the Network Status table Configuring the System Network 4 When the initialization is finished press NETWORK DISPLAY to return to the Network Display Manual Configuration Most of the time Automatic Configuration is what you will want to use since you ll want all of your Sampling Heads on line and being used for monitoring But there will be times for example when taking a Sampling Head out of service for maintenance when
201. ow Connection to a vacuum line is necessary to pull air through the Sampling Head to de posit particles on the filter A 9 5 mm in ID hose is connected to a fitting on the Head The Head measures the air flow and uses the total volume in its calculations The factory calibration has been set for AS450 0 5 to 1 5 scfm 14 2 to 42 5 L min AS1700 1 5 to 2 5 scfm 42 5 to 70 8 L min The type of sensor used to measure the air flow requires that the operator enter the alti tude and approximate air temperature The factory default has been set to an altitude of 0 ft 0 m and a temperature of 298 K 25 C If you need to alter either of these use the ASM1000 Miscellaneous Parameter menu screen from the Network Display Screen press F4 then Fl then F4 While totalizing the air flow through the Head the ASM1000 also checks the air flow to be within alarm limits The factory defaults for these are Low flow 0 5 cfm 14 2 L min High flow 2 5 cfm 70 8 L min These limits are set in the Alarm Parameter menu screen from the Network Display Screen press F4 Fl F1 If it is necessary to recalibrate for a different flow range refer to CAM Air Flow Cali bration on page 197 Connection to Alarms Both the ASM1000 and the Sampling Head have relay contacts that are activated upon certain alarm conditions Connection to these relays is through a six position terminal board on the side of each unit Table 2 The r
202. particulates deposited on the filter Mechanically the Detector and its Shield Can have been precisely gapped to position this assembly for optimum aerodynamic performance with particles expected in the nuclear facilities the Alpha Sentry System is designed to monitor It has also been leak tested so it isn t advisable to do more disassembly than is described in the next sections 215 216 Maintenance The MCA Housing is easily separated from the upper part of the Head by removing three Phillips head screws in the bottom of the assembly The internal circuitry is connected to the components in the upper section through two connectors 1 A multi pin keyed connector containing the wiring to alarms indicators air flow and door sensors and the Preamplifier Amplifier 2 A threaded coaxial cable connector that brings the amplified detector signal to the MCA Disconnecting these cables allows the MCA Housing to be completely removed from the Sampling Head When reassembling the MCA the connectors are keyed but the coaxial connector can be damaged if over tightened On later units an MCA Base Plate with feet is installed under the MCA housing using the three Phillips head screws Upper Housing To service the Upper Housing you will first have to remove the cover plate which is held in place by three countersunk Phillips head screws refer to Figure 81 A torquing tool is required to complete the reassembly of the Sampling Head
203. peration that is being performed At the very bottom of the LCD display you ll always find the current labels for these keys For example in the main menu the key F1 has the label Filter Change F2 the label Perf Check and so forth When one of the keys is pressed the usual response is for the key s label to change to re verse video and the screen to display a Please wait message In addition to these five soft keys there are three permanently labeled functions keys which are used as follows The Stop Alarm key is used to acknowledge alarm conditions Its use will be cov ered in detail in Handling Alarms on page 62 The Detailed Display key is used to change to a detailed look at just one of the Sampling Heads in the system The Network Display key will immediately change the display from whatever op eration you may have been performing back to the overall Network Monitoring Dis play shown in Figure 27 However if the system is waiting for data entry a CAM or a response to an error message you must complete that operation before return ing to the Network Display 49 50 System Operation Numeric Keypad Directly below the Function Keys is a numeric keypad that is used for entering parame ters into the ASM1000 The basic rules governing the use of these keys can be found in the following section Numeric Keypad Conventions Numeric Keypad Conventions Having completed our general overview
204. perations may be performed at all times The procedures for assigning access codes and the ASM1000 functions for which they are valid are explained in The Security System on page 35 CAUTION The system is shipped with the security system disabled CAM IDs This allows you to enter up to 39 alphanumeric characters for each sampling head mak ing it easier to identify individual heads This ID will appear on various ASM1000 screens when accessing that sampling head Note that some screens with limited display space will show only the first few characters of the ID you should keep this in mind when assigning the descriptive IDs Alarm Parameter Defaults Included in the Alpha Sentry CAM System are a series of automatic self testing routines which monitor the status of the network and the sampling heads Three of these tests have parameters which can be tailored for each installation These parameters and their default values are discussed in the following paragraphs Maximum Allowable Peak Shift Should the gain of the electronics in a CAM Sampling Head change dramatically the spectral peaks will shift This parameter which has a Factory Default value of 15 chan nels determines how much of a shift is allowed to occur before an Instrument Fault alarm is triggered Acute Alarm Minimum Count Limit This is the minimum number of counts in the transuranic region that must be present be fore an acute alarm is annunciated the default va
205. pling head address which indicates its location on the network Each sampling head has a unique address that can be read by its ASM1000 The location address is coded by a switch in the NTB Remove the chrome plated plug on the NTB to access the switch Each NTB on an ASM1000 sampling head network must have a unique address The address codes and their switch positions are given in Table 1 The NTB switch can be either a three pole DIP switch or a rotary switch For the DIP switch labels are screened on the PC board identifying the individual poles as 1 2 and 4 the DIP switches themselves may identify the poles as 1 2 and 3 For the rotary switch the positions may be numbered 0 7 or 1 8 Table 1 NTB Address Setup DIP Switch Pole Rotary CAM Switch 1 2 4 Position 1 OFF OFF OFF O or 1 2 ON OFF OFF 1 or 2 3 OFF ON OFF 2 or 3 4 ON ON OFF 3 or 4 5 OFF OFF ON 4 or 5 6 ON OFF ON 5 or 6 7 OFF ON ON 6 or 7 8 ON ON ON 7 or 8 Some DIP switches may be labeled open instead of offand closed instead of on Host Computer Interface The optional Host Computer Interface consists of a set of commands allowing a Host Computer to monitor the operation of multiple CAMs and read and write data and vari ous Setup parameters Providing an Air Flow Installation instructions for this interface will be found in Chapter 4 Host Computer In terface Providing an Air Fl
206. portion of the screen you ll find for each sampling head in your network the results of the previous Efficiency Calibration if any in the column labeled Eff The Status column contains the word Primed for those sampling heads which are on the network and ready to be calibrated and N A for sampling heads which are not present on the network Calibration Efficiency Calibration AAA AAA 1 2 3 4 a 6 7 E CAM Heads primed for Calibration Source Activity dem 4 4355F 6004 Count Time min 8 5 Figure 74 Efficiency Calibration Display Note that the sampling heads which are Primed are still being actively used for monitor ing if they are still on the network and each will continue its monitoring function until you actually begin to calibrate it However Instrument Faults such as low and high air flow are not tested during the Efficiency Calibration Process This is indicated by the LEDs at each sampling head being set to Green On and Red Blinking At the bottom of the screen you ll find the activity of the calibration source which is to be used as well as the counting time for the calibration process If these are not correct refer to Modifying the System s Parameters on page 93 for the procedure to use for chang ing these values If a Release condition is detected on any Head while in the Primed state the Calibration function will be aborted The Network Display and the appropriate annunciator will be ac
207. presenting the hex value of the access level whose range value is to be set The values are as fol lows 00 Access level 1 Ol Access level 2 02 Access level 3 03 Access level 4 Two values separated with a lt cr gt must be specified representing the access code range For each entry an ASCII set of numeric characters representing the decimal value of the range limit must be specified The range will be specified as follows lt value 1 gt lt cr gt lt value2 gt Where valuel is the range start and value2 is the stop If the length has been set to 6 the start and stop must be within 000000 to 999999 limit 181 Technical Reference Length is specified through the SetMenuAccessLength command as a value between 0 and 9 It determines the number of digits that will be returned when the access range is read or the number of digits that must be written when the access range is set Note The two range entries valuel and value2 must be separated by a carriage return character lt cr gt ODh Response lt checksum gt lt EOT gt Read Access Range The ReadAccessRange command returns the current access code range for the specified access code level Command lt address gt lt CAM gt lt D0 gt lt level gt lt cr gt lt checksum gt lt EOT gt The CAM in the command is ignored Parameters lt level gt Two ASCII numeric characters representing the hex value of the access level whose range value is to be rea
208. pt of the EOT for a command turns around its lines set RTS and transmits n SOH 0x01 characters as a delay to give the Host time to turn around its line to listen for the response The number of delay characters n is variable in order to accommodate a wide range of Host computers and conditions This is then immediately followed by the response to the command After the EOT of the response is sent the ASM1000 turns its line around clear RTS to wait for the next command Command Protocol The general command structure is as follows Syntax lt address gt lt C AM H gt lt command gt lt data gt lt cr gt lt checksum gt lt EOT gt Parameter 1 char address 2 char CAM 1 char command 2 char data n char checksum 2 char EOT 1 char Command start character ASM1000 Address hex RS 485 01 FF RS 232C 00 CAM Address CAM specific 1 8 ASM network wide 00 Command code Data if required up to 245 bytes Command string checksum See Checksum on page 110 End of Transmission character EOT 044 Note The total length of a command may be up to 255 bytes Response Protocol There are three types of responses 108 Message Protocol e Normal Everything is okay the requested data is being sent e Error An error was detected while receiving the Command bad command checksum error etc e Busy The ASM1000 is busy performing another task and cannot respond i
209. r to Send Data Set Ready Ground Carrier Detect Data Terminal Ready Each of these lines is pulled up to 12 V with 10 KQ Positive Voltage Spacing Negative Voltage Marking Connectors and Signals J103 Host Interface ASMO01 RS 485 Option 9 pin Male D with threaded inserts Pin Signal Description No connection No connection Terminator 120 B side Network Ground 470 2 to ASM1000 Chassis RS 485 Serial Data Line B bi directional No connection No connection Terminator 120 Q A side o 0 N QO a A WB ND RS 485 Serial Data Line A bi directional End unit s in ASM1000 Host Interface Network must have terminator connected across RS 485 Data Lines 5 and 9 Jumper 3 to 5 and 8 to 9 235 Maintenance ASMO02 RS 232 Option 25 pin Male D with threaded inserts Pin Signal Description 1 Ground Transmit Data Out Receive Data In Request to Send Clear to Send Data Set Ready Ground 0 N O aA A WO PN Carrier Detect 20 Data Terminal Ready Each of these lines is pulled up to 12 V with 10 KQ Positive Voltage Spacing Negative Voltage Marking J104 CAM Power 3 Pin DIN Female Pin Signal Description 1 24 V ac 1 Out 2 Chassis 3 24 V ac 2 Out Shield Chassis 24 V ac rated at 15 W maximum to power one Sampling Head within 150 feet 236 Connectors and Signals Alarms 6 position Terminal Board Terminal 1 2 5 6 Re
210. ration over the range of 1 MeV to 11 MeV De fault calibration parameters are entered at the factory for the system the user does not need to energy calibrate the unit The factory defaults are used until the instrument soft ware sees sufficient actual data to modify the calibration if necessary This automatic en ergy calibration procedure is explained in more detail in Automatic Energy Recalibration on page 159 Efficiency Calibration The detector counting efficiency ep is defined as En gt 1 where A is the sum of counts in the analysis region for a suitable standard source S is the known activity in dpm of the standard source and t is the count time in minutes The efficiency must be established for each sampling head individually Once estab lished it can be checked periodically as part of a maintenance program Refer to The Performance Test on page 90 157 Algorithms Since the intent of a CAM System is only to alarm not to exactly quantify the amount of plutonium it is not necessary to keep track of the efficiency uncertainty However good calibration practice does require the use of a source whose activity is known accurately and use of a count time that produces a sufficiently large number of counts in the pluto nium region gt 20 000 counts so that the efficiency uncertainty becomes sufficiently small compared to other sources of uncertainty For example 10 000 counts translates to a 1 per
211. re 0 to 25549 135 Host Computer Interface Communication Parameters 2A 2B 2C 2D These commands read and write various parameters for communication between the ASM1000 and CAM Supported in Version V2 12 and up Write Number of Retries Parameter C3 2A This command sets the command retry value in the ASM1000 which determines the number of retries on a communication failure between the ASM1000 and CAM Accept able limits are 1 through 255 Initial default setting is 5 Command lt AAC gt lt C3 gt lt 2A gt lt value gt lt checksum gt lt EOT gt Size 11 number of digits in lt value gt Parameter AA RS 485 address hex of ASM1000 set to 00 for RS232C C CAM number C3 write Variable opcode 2A identifier code for Number of Retries parameter lt value gt 1 to 25510 Response lt checksum gt lt EOT gt Size 4 bytes Read Number of Retries Parameter D3 2A This command reads the current setting for the Number of Retries parameter Command lt AAC gt lt D3 gt lt 2A gt lt checksum gt lt EOT gt Size 11 bytes Parameter AA RS 485 address hex of ASM1000 set to 00 for RS232C C CAM number D3 read Variable opcode 136 Commands and Responses 2A identifier code for Number of Retries parameter Response lt value gt lt checksum gt lt EOT gt Size 15 bytes Parameter lt value gt possible values are 0 to 25510 Write Retry Wait Parameter C3 2B This command sets the response wait value in the ASM
212. re not out of service for an excessive pe riod of time during a filter change the ASM1000 starts a timer when the user logs in for a filter change If the filter change is not finished when the timeout is reached the sam pling heads will return to normal operation The timer used for this is the same one used for Automatic Logout described in Auto matic Logout on page 57 The factory default time interval is 60 minutes but this can be changed by the System Manager during system installation and setup Setting the Date and Time The menu screen for setting the system date and time is part of the Filter Change menu because it is important to change the filter when the date or time is set To do this press Filter Change F1 This will bring up a submenu Figure 53 showing Filter Change and Date Time Setting the Date The ASM1000 s date may be changed by entering a new date in the format shown Year entries are two digits with 80 99 interpreted as 1980 1999 and 00 79 interpreted as 2000 2079 87 System Operation System Date Tine Date dd mm u0 MN 970ct94 Time hh mm ss l 14 33 20 HARN ING Always perform Filter Change after changing system dater time Figure 53 Setting the System Date and Time Setting the Time The ASM1000 s time may be changed by entering a new time in the format shown Note that times after noon must be entered in 24 hour format for example 1 35 pm is entered as
213. rew started is horizontally centered in the opening on the plastic In Line Manifold Loosen the clamp and position it between the next set of holes install these screws fully into their respective PEM nuts Note Make sure the metal Air Intake Seal Ring stays all the way to the outside so that the O Ring is compressed against the plastic lip 14 15 16 Repeat until all 15 screws are installed Remove the clamp If not already installed place the 1 inch 2 5 cm O Ring in the Manifold s Intake Pipe connection as shown in Figure 226 Press the O Ring into the plastic nut making sure that it is behind the threads in the nut and against the pipe s shoulder If you removed the AS020 Alarm Option go to Reinstalling the AS020 Alarm on page 232 for instructions on replacing it If your unit doesn t have the Alarm Option go to Sampling Pipe Connection on page 224 231 Maintenance Reinstalling the AS020 Alarm 232 This section tells you how to reinstall the ASO20 Alarm Option If your sampling head doesn t include the Alarm Option go on to Sampling Pipe Connection on page 224 Remove the three countersunk flat head screws which secure the sampling head s cover Verify that the spacer is in place inside the top of the In Line Manifold Locate the alarm wire harness and 8 pin connector in the sampling head Slide this connector through the opening in the sampling head top cover The countersi
214. ric Keypad Conventions on page 50 will apply In addition the following should be noted 1 After typing in a value press either the ENTER key or the VERT INDEX key 2 If the value isn t valid isn t within the parameter s allowable range an Out of Range message will be displayed Press any key to acknowledge the message then re enter the value 93 System Operation 3 Ifthe value is valid the ASM1000 will accept it then automatically move the selection highlight down to the next parameter in the list Parameters for Uranium The factory default settings are for Pu 239 The following three steps will change those settings to those used for uranium 1 Change the DAC definition from 2E 12 the default for plutonium to your local DAC value for uranium In the U S that value is 2E 11 2 Change the analysis window upper energy and window width The plutonium defaults of 5 7 MeV and 2 7 MeV respectively should be changed to 4 7 MeV and 1 7 MeV for uranium 3 Using the S578 Alpha Sentry PC Setup Software change the acute alarm limit multiplier from 1 the default for plutonium to 10 for uranium Refer to Acute Alarm Minimum Count Limit and Acute Alarm Limit Multiplier on page 40 Alarm Limits Parameters Pressing Alarm Setup F1 from the Parameters screen will take you to the display shown in Figure 56 where you can edit the various alarm limits Alarm Parameters Al Limit Alarm Method DAC Limit CCAMH 1
215. rm on page 170 Theory of Operation Acute Release Determination An acute release is determined at the Sampling Head where the MCA looks for either excessive counts or excessive change in counts in the transuranic TRU region The be havior of the Head s embedded acute algorithm is modified by the alarm method selected at the controller When the alarm method is set for DAC Hr mode the algorithm looks for excessive counts in the TRU region When the alarm method is set for DAC mode the al gorithm looks for excessive change in counts in the TRU region Either the average counts per channel or the delta in the average counts per channel in the TRU region that is plutonium or uranium are compared to the equivalent values in the background re gion from the end of the TRU window to the 6 05 MeV peak at 30 second user selected intervals Figure 4 Background Transuranic 6 05 MeV Region Peak Figure 4 The TRU Region vs the Background Region If this ratio TRU to background is greater than 2 and the sum of the counts in the TRU region are greater than 80 user selected an acute release is annunciated Setting the acute alarm minimum count limit is covered in Acute Alarm Minimum Count Limit on page 28 The qualifier of 80 counts prevents false alarms If there were no qualifier the unit would give an alarm with only two counts in the TRU region and a single count in the back ground region which is obviously
216. rn character lt cr gt ODh Command Syntax lt address gt lt C AM H gt lt command gt lt data gt lt cr gt lt checksum gt lt EOT gt A valid command sequence always begins with a character 24h and ends with a EOT character 04h In addition Command start character 24h address Consists of two ASCII characters ranging from 00 through FF representing the ASM1000 address For the Laptop Interface this value must be 00 CAMA Consists of a single ASCII character ranging from 1 through 8 representing the CAM number to which this command is being ad dressed Setup Command Protocol command Consists of two ASCII alphanumeric characters ranging from 00 through FF representing the command opcode Refer to the list that follows for a summary of command codes data This field is command specific If it is required it will consist of a number of ASCII characters from 0 to 245 maximum represent ing the data required by the command checksum Consists of two ASCII alphanumeric characters representing the 8 bit sum of all the characters in the command string excluding the two lt checksum gt characters and the lt EOT gt character which are not included in the checksum calculation p us the actual length of the string from the command start lt gt field to the last character in the lt data gt field or if no lt data gt field is present to the last charac ter in the lt command
217. rocedur s lt o o toce 5405 2 6X RGR EERE REE RESET EL ERE REE HS 213 ASMILDOO ioa a dy eh da ae A we eR Oe ee Ae ew ad ea he a 213 Sampling Head cerrarse Se REO Eee AAA 214 Cleaning the PIPS Detector cos misne pic a a a ee 214 Disassembly and Reassembly soos sacs apnd o e aa e e a aa e a a e e i 215 ASMI000 osos RD ERED ERE e apep a SRE RESETS DA 215 Sampling Head ie measa a ee ke ee qe Se A we A A we ew a 215 MC Airs feo hehe AAA AAA AA deste ea hw BES 6 x 216 vii Upper Housing exce tage dee mee eee A Ae 216 Firmware Update and Acute Test Option 0 2 0 0 000000000000 220 Installing the Model S 37 gb ci ee ek ew a we ae or ER E 220 Field Installing the Alarm Option 2 2 ee uas 223 Checking for Proper Operation osde be a ee ra ee ee E 223 Configuring the Annunciators x e g massi enaa ai e e aa a a ee 224 The In Line Mantlold ec trape eR ER HEEL bgt eka HERES EEL Epu 224 Sampling Pipe Connection cis iia ic a a SE Bo eee Ge a eh we a i 224 Repositioning the Intake Pipe o alae e 225 Removing the Seal RING e mail 226 Installing the ASO10 In Line Manifold o e a 227 Removing the Model ASO20 Alarm o e e 228 ASO10 Installation Procedure osos acidos woa ea a w aa i E a A e a 228 Reinstalling the ASO20 Alarm i ae aee oaa ee 232 Connectors and Signals e s fae eb ee oem ERE RR ROR RE Rw Ee eS 233 ASMIQ00 5 0 0 amp she wed oe E BA Sars WH See Oe ed e
218. rum since for all practical purposes it does not decay It is important to note that you do not have to wait until the end of a count cycle to be no tified of an acute release At a user selected interval which by default is 30 seconds the Sampling Head calculates a ratio that determines whether an acute release has occurred based on the counts seen within the last interval If an acute alarm condition is indicated the head notifies the ASM1000 which will terminate the count cycle and turn on appro priate annunciators on the head and on the ASM1000 The ASM1000 will also read out the spectrum and place it in the Last Alarm Spectrum register as well as perform all the usual calculations associated with a readout If the head is no longer connected to an ASM1000 the head will continue to monitor based on the last settings from the ASM1000 and turn on its own annunciators if an acute alarm condition is detected Any spectrum that causes an acute or chronic release alarm is saved by the CAM Head as the Last Alarm Spectrum which can be displayed at any time through the ASM1000 for close examination The other alarm condition that may be saved as Last Alarm Spec tra is High Background Each Sampling Head has only one Last Alarm Spectrum which is the last one that caused an alarm Spectra which caused earlier alarms are not saved although the results of the last 50 alarms with their date and time of occurrence are availa
219. s Only the efficiency determined by the calibration function is stored as the official efficiency and used in calculations If the ASM1000 determines that the peak has shifted more than five channels from its previous location it will generate a Peak Shift alarm indicating a possible electronics malfunction The annunciators are not activated by this error nor is it recorded in the Alarm Log If this error occurs the system should be examined by authorized mainte nance personnel For further assistance the above procedure can be displayed on the ASM1000 s screen by pressing the Help F1 button while in the Performance Check display The Help display contains three pages To change between the pages press the VERT INDEX key To return to the Performance Check display press ENTER Returning the System to Service When you are finished making the tests press NETWORK DISPLAY to end the Perfor mance Check process and return to the Network Display Modifying the System s Parameters Note that it is possible to end the Performance Check process at any time Should you end the process without testing all of the sampling heads those sampling heads which were not tested will retain their previous Filter Change Last Change date only those sampling heads that were tested will have their data updated System Timeout To insure that the sampling head door alarms are not out of service for an excessive pe riod of time during a Per
220. s an RS 485 or RS 232 connection between the ASM1000 and a Host computer 51 System Operation J104 CAM POWER 24 V acis supplied on this connector to power a single local Sampling Head A local sampling head is one which is within 45 m 150 ft of the ASM1000 ALARMS Terminal Strip A six position barrier strip is used to connect external indicator lamps and or annuncia tors to the ASM1000 s alarm logic All alarm conditions from the Sampling Heads con nected to the CAM Network are annunciated via this terminal strip 250V 1 2A SB This is the fuse holder for the main power to the ASM1000 and as the label implies a 250 V 0 5 Amp Slow Blow fuse is the only type that should be used 100V 130V AC 60Hz 40W This is the exit point for the unit s line cord Alternatively if the ASM1000 is to be hard wired to the power mains there is a hole plug on the bottom of the chassis which may be removed to bring in the power cable The Network Display During routine monitoring the Network Display shown in Figure 27 is the screen that is most commonly displayed on the ASM1000 870ct54 Figure 27 The Network Display 52 A Guided Tour The Network Display give you an overview of your entire CAM Network This overview is provided by the CAM Display Boxes one of which is shown enlarged in Figure 28 If a Custom ID has been entered for this Head the CAM n at the top of the box will be replaced by the CAM number
221. s linked to up to eight Sampling Heads on a daisy chained RS 485 half duplexed network A 3 m 10 ft C 2000 communications cable is provided with each ASM1000 This can be connected directly to a single Head which will enumerate as CAM 1 RS 485 networks can be extended up to 1200 m 4000 ft but must be terminated at both ends in the characteristic impedance of the cable In the Alpha Sentry System the ASM1000 provides one end of the network and has an internal 120 ohm termination For a single sampling head within 7 5 m 25 ft no additional termination is necessary The recommended cable is a Belden 3105A RS485 Cable or equivalent UL Listed cable The signals are on pins 5 and 9 The cable drain wire connects to pin 4 and the cable shield connects to the cable hood refer to Connectors and Signals on page 233 for more information Network Tee Box For single Head distances greater than 7 5 m 25 ft or when using multiple Heads a Model CA2000 Network Tee Box NTB must be installed at each Head Each NTB in cludes a 3 m 10 ft C2002 cable to connect the NTB to its Head and a Terminator to use when it is at the far end A terminator must be used if the network distance is greater than 7 5 m 25 ft Either of the connectors on the NTB labeled Network A and Network B can be connected to the ASM1000 or the terminator side of the network 17 18 Installation NTB Address Switch The other function of the NTB is to provide a sam
222. s of k are given in Table 12 165 Algorithms Table 12 Confidence Levels and k Values Oo 1 6 k 0 001 0 999 3 090 0 005 0 995 2 576 0 010 0 990 2 326 0 025 0 975 1 960 0 050 0 950 1 645 0 100 0 900 1 282 0 200 0 800 0 842 0 250 0 750 0 675 0 300 0 700 0 525 0 400 0 600 0 254 0 500 0 500 0 Analysis Results The analysis results for the different display screens are calculated as explained in the following sections Count Rate The average plutonium net count rate in cpm is calculated from the plutonium net area as Ap 13 where t is the spectrum collect time in minutes The uncompensated plutonium count rate is calculated as 166 Spectrum Analysis Es i x 2 U s 14 Pu The uncompensated plutonium percent error is calculated as X1i 1 5 i Xo Sur 100 x 15 Yi i Xo Pu concentration The current plutonium concentration in the air is calculated as TIA T A T Ca T i pa D Pu i l 16 Ti b Kxxx V where Ap T is the plutonium net area from the measured spectrum with the collect end ing at time T Ap T _ is the plutonium net area from the previous measured spectrum with a col lect ending at time T _ T is the time since the filter was last changed in hours T is the spectrum collect time in hours and assumed to be the same for both con secutive spectra V is the volume of air in liters that has go
223. see Figure 36 instead This display shows a reversed Bar Graph indicating the alarm condition CAM Hi Detailed Display DAC hres Conc CutismL CPH ie Flow cfm Alarm Count Cycle min 343 Serial 642920801P Last Filter Change 285 ep23 Effncy Cal Date 218 ep9aq CATA Fain Flow Cal Date 95ep92 Flow DAaChr Filter Perf Data System Log Change Check Review Setup In Figure 36 An Alarm Condition in the Detailed Display 69 System Operation In addition to the CAM Network Address at the top of the display you 1l also see a brief description of the sampling head on the second line of the screen This description is as signed by the System Manager when the sampling head is initially configured Alarm Status Figure 36 shows the details of a sampling head that it is currently generating an Alarm Note that an Alarm causes e The bar graph region of the display to be shown in reverse video The Alarm entry to the right of the display to show a description of the alarm condition rather than the phrase OK If a single sampling head generates multiple alarms the one shown in the Detailed Dis play will be the first Alarm that meets any of the criteria in the following list e A Release Alarm Acute takes precedence over Chronic e An Instrument Fault Alarm if more than one displayed in the order of impor tance e A High Background Alarm Sampling Head Data This section covers Radioacti
224. sembly but repeat the cleaning treatment with fresh cot ton balls to eliminate traces of contamination Blow dry with air or N3 gas and put under vacuum for 15 minutes or heat to 50 C for an hour to remove residual moisture before applying bias Note that cleaning is generally not effective in curing problems of leakage current radia tion damage or excess condensing water vapor Neither will it repair physical damage to the junction s Suspect detectors should be checked carefully for physical damage to the surface s before other actions are taken Disassembly and Reassembly Instructions for disassembling and reassembling the ASM1000 the Sampling Head and the MCA are given in this section ASM1000 This electronics chassis normally does not require disassembly but if you need to re move the cover to gain access to the internal components refer to Changing the ASM1000 s Power Wiring on page 15 for instructions Sampling Head The Sampling Head is a sophisticated instrument and must be handled carefully to pre vent damaging components or disturbing the factory electronic and mechanical calibra tions The lower dark gray housing contains the MCA This has been electronically serialized to the Upper Housing which contains the Detector and the Air Flow Sensor The factory calibrations of the Air Flow Sensor and Detector Efficiency held in the MCA are used by the ASM1000 in its analysis of the spectra collected from
225. sitive DATA B Space Logic 0 is Positive Figure 65 Multi Drop Network 147 Host Computer Interface Refer to ASM1000 Communications Setup on page 144 for information on selecting the address and other communication parameters Once entered these parameters are re tained in ASM1000 s battery backed memory The number of Delay Characters is selectable to provide adequate time for the Host Computer to be able to be ready to listen for the ASM1000 s response Model ASMO02 RS 232C The RS 232C interface allows a direct connection to a computer or a modem The ASM1000 is configured as if it were a Terminal for a list of the connector signals refer to ASMO2 RS 232 Option on page 236 The only active signals however are the Transmit Out and Receive In lines Pull up resistors to 12 volts on the other commu nication signal lines should simplify the interfacing Refer to ASM1000 Communica tions Setup on page 144 for information on setting the Interface s data transmission Baud rate If the Host Computer has a limited buffer the ASM1000 will respond to XON and XOFF characters for Flow Control XOFF stop XON start Field Installation 148 The Host Interface is a small board containing a connector that will mount in the ASM1000 chassis in the cut out labeled J103 A short ribbon cable is included with the board You will also need the S578 Alpha Sentry PC Setup Disk and C2004 cable that was pro
226. ssage Figure 84 will appear xi Update complete Please restart 45M1000 Figure 84 Download Successfully Completed Enable or Disable the Acute Test To modify these options please refer to the Downloading Interface Parameters on page 152 for a guided procedure Reconfiguring the Optional Host Interface in J103 To modify these options please refer to the Downloading Interface Parameters on page 152 for a guided procedure 222 Field Installing the Alarm Option Field Installing the Alarm Option The Model AS020 Alarm Option which mounts on top of the sampling head provides an audible and visual alarm for the sampling head The AS020 is provided as a fully assembled unit Before installing it on the sampling head the cover plates must be removed from both the sampling head and the AS020 1 10 Put the sampling head off line and disconnect its power Remove the three pan head screws which secure the ASO020 s flat cover and remove the cover Remove the three countersunk Phillips head screws which secure the sampling head s cover Remove the Head s cover it will not be used Locate the alarm wire harness and 8 pin connector in the Head Slide this connector through the opening in the AS020 s cover Press the connector firmly into its mate on the printed circuit board in the AS020 s housing Note that the connector is keyed for proper orientation Reattach the ASO20 s flat cover to the ASO
227. ssume that the spectrum is a linear combination of single energy response functions This means that at each valley point Xn its contents are a linear combination of the tails of the peaks to the right of it Thus the counts per channel at X3 are caused by the 8 78 MeV peak at X by the 8 78 MeV and the 7 68 MeV peaks and at X by the 8 78 MeV 7 68 MeV and 6 05 MeV peaks All peaks contribute at Xo Let us also assume that the tail of a peak below the valley point to the left of it can be described by a single exponential function of the form T m X b e 4 That is for the 8 78 MeV peak Mg Xi Dg73 Ts e 5 According to this model the 8 78 MeV tail must pass through values that represent only its contribution at X3 and Xp At channel X3 we define this contribution as 1 X k Xea Y 3 av 2k 1 2 i 6 where k is 2 and Y is the counts per channel at channel X At channel Xo we define the contribution due to the 8 78 MeV peak Y og 78 as 163 164 Algorithms ES ES lt 7 iS Y Yovav 7 08 78 LM x where Yay is calculated around Xo using Equation 6 In principle the numerator in Equation 7 should include the counts in the tail portion of the response function as well However due to the fact that the contribution of the tail to the total sum is rather small we assume Equation 7 to be a reasonably good approxima tion We can now defi
228. t lt cr gt lt analysis window gt lt cr gt lt confidence gt lt cr gt lt acute count lim gt lt cr gt lt checksum gt lt EOT gt RS 485 address hex of ASM1000 RS 232C 00 CAM number 0 not used write ASM setup parameters command low air flow alarm limit L min 14 16 lt low flow lt 282 92 high air flow alarm limit L min 14 16 lt high flow lt 282 92 count cycle time minutes 5 0 count cycle DAC hr alarm limit DAC hours 0 1 lt DAChr limit lt 100 0 DAC factor uCi cm 1 0E 16 lt DAC factor lt 10 0E 8 upper energy limit MeV 0 0 lt upper energy lt 10 0 analysis window MeV 0 0 lt analysis window lt 10 0 confidence level sigma 1 0E 2 lt confidence lt 10 0 acute alarm minimum count limit counts 0 0 lt acute count limit lt 255 Commands and Responses Response lt cr gt lt checksum gt lt EOT gt Size 5 bytes Note Count cycle time will take effect at the beginning of the next count cycle All other parameter values are used for the next appropriate calculation and or check Write ASM System Parameters 24 This command writes the system time and date parameters to the ASM1000 Command lt AAC gt lt 24 gt lt date gt lt cr gt lt time gt lt cr gt lt checksum gt lt EOT gt Size 27 bytes Parameter AA RS 485 address hex of ASM1000 RS 232C 00 C CAM numter 0 not used 24 write ASM system parameters command date system date
229. t 3A gt lt checksum gt lt EOT gt 112 Commands and Responses Parameter AA RS 485 address hex of ASM1000 RS 232C 00 C CAM number 0 not used 3A Enhanced summary alarm status command Response lt on line status gt lt cr gt lt radiation alarm gt lt cr gt lt trouble alarm gt lt cr gt lt data available gt lt cr gt lt maintenance status gt lt cr gt lt checksum gt lt EOT gt Size 17 bytes Parameter on line status on line status of CAMs binary format 1 byte appropriate bit 1 on line and counting ap propriate bit 0 any other state bit 0 bit 1 bit 2 bit 3 bit 4 bit 5 bit 6 bit 7 CAM 1 CAM 2 CAM 3 CAM 4 CAM 5 CAM 6 CAM 7 CAM 8 radiation radiation alarm status of CAMs binary format alarm 1 byte appropriate bit 0 no radiation alarm bit 0 bit 1 bit 2 bit 3 bit 4 bit 5 bit 6 bit 7 CAM 1 CAM 2 CAM 3 CAM 4 CAM 5 CAM 6 CAM 7 CAM 8 113 114 Host Computer Interface trouble alarm trouble alarm status of CAMs binary format 1 byte appropriate bit 0 no trouble alarm Trouble bit will be set in this byte if the Perfor mance Check fails bit 0 bit 1 bit 2 bit 3 bit 4 bit 5 bit 6 bit 7 CAM 1 CAM 2 CAM 3 CAM 4 CAM 5 CAM 6 CAM 7 CAM 8 data available new data available binary format 1 byte ap propriate bit 0 data not available bit 0 bit 1 bit 2 bit 3 bit 4 bit 5 bi
230. t 6 bit 7 CAM 1 CAM 2 CAM 3 CAM 4 CAM 5 CAM 6 CAM 7 CAM 8 Note The New Data Available bit means that a count cycle has ended and its calculated data is available for read out It will remain set until the calculated data is read by the Read Calculated Data Commands pages 117 118 and 118 for the appropri ate sampling head at which time it is reset maintenance CAM mode binary format 1 byte appropri ate bit 1 CAM is in a maintenance state bit 0 bit 1 bit 2 bit 3 bit 4 bit 5 bit 6 bit 7 CAM 1 CAM 2 CAM 3 CAM 4 CAM 5 CAM 6 CAM 7 CAM 8 Commands and Responses Detailed CAM Status 11 This command provides a detailed status of a particular sampling head Command lt AAC gt lt 1 1 gt lt checksum gt lt EOT gt Parameter AA RS 485 address hex of ASM1000 RS 232C 00 C CAM number 11 detailed CAM status command Response lt state gt lt cr gt lt alarm gt lt cr gt lt fault gt lt cr gt lt checksum gt lt EOT gt Size 19 bytes Parameter state CAM state binary format 2 byte appropriate bit 0 normal operation bit 0 O auto 1 manual bit 1 not used bit 2 1 primed bit 3 not used bit 4 1 maintenance bit 5 not used bit 6 1 linearizing bit 7 1 initializing bit 8 not used bit 9 not used bit 10 not used bit 11 1 dropped bit 12 1 not counting bit 13 1 not defined N A bit 14 not used bit 15 not used
231. t DAC factor gt lt cr gt lt upper energy gt lt cr gt lt analysis window gt lt cr gt lt confidence gt lt cr gt lt acute count lim gt lt cr gt lt checksum gt lt EOT gt Size 112 bytes Parameter low flow low air flow alarm limit L min high flow high air flow alarm limit L min count cycle count cycle time minutes DACHr limit DAC hr alarm limit DAC hours DAC factor DAC factor uCi em 121 upper energy analysis window confidence acute count lim Host Computer Interface upper energy limit MeV analysis window MeV confidence level sigma acute alarm minimum count limit counts Read ASM System Parameters 21 This command reads various ASM1000 system parameters Command lt AAC gt lt 21 gt lt checksum gt lt EOT gt Parameter AA C 21 Response Size 42 bytes Parameter version date time RS 485 address hex of ASM1000 RS 232C 00 CAM number 0 not used read ASM system parameters command lt version gt lt cr gt lt date gt lt cr gt lt time gt lt cr gt lt checksum gt lt EOT gt ASM software version number string format 19 chars system date date format system time time format Read CAM Setup Parameters 22 This command reads various sampling head setup parameters These parameters are on a per sampling head basis Command lt AAC gt lt 22 gt lt checksum gt lt EOT gt 122 Commands and Responses Parameter AA C 22 R
232. t may indicate an electronics malfunction 1t will cause a Peak Shift alarm After you ve made all necessary changes you can return to the Network Display or De tailed Display by pressing either NETWORK DISPLAY or DETAILED DISPLAY 105 Host Computer Interface 4 Host Computer Interface The Alpha Sentry System can be supplied with an optional interface allowing a computer to monitor the system and to enter some of the operating parameters The interface s commands allow the Host Computer to monitor the operation of multiple CAMs and read and write data and various Setup parameters The interface can be provided with RS 485 or RS 232C hardware compatibility Note The standard RS 232 port must be configured for Printer if the Host Interface is to be active See Figure 12 on page 30 Another set of commands that allow the Host Interface or the standard RS 232 interface to be used for setting additional parameters are described in Setup Command Protocol on page 172 e The Model ASMO1 RS 485 version is used in a half duplex multi drop network that is similar to but separate from the sampling head network Up to 31 ASM1000s may be attached to the Host Computer via the RS 485 network e The Model ASMO2 RS 232C version operates in full duplex mode with XON XOFF handshake allowing a single ASM1000 to be attached to the Host Computer This chapter assumes that the optional Host Computer Interface is installed in your ASM1000
233. t mecha nism and o rings should be checked Air Flow Path Clean and decontaminate the air flow path as required including the detector face Alarm Check Activate the Lamp Audio and Relays via the ASM1000 menu to verify their operation Filter Drawer Lift Mechanism Open the door lift the piston and put a drop of silicon lubricant on the hex sided ram Verify smooth operation by closing the door and rotating the knob several times O Rings Inspect all O Rings for wear and tear Replace if necessary See Figure 79 The most critical part is the piston seal on top of the lifter that brings the cartridge into position It should be replaced every 1 2 years with Canberra part number ICN 85227797 which can be ordered from Canberra Customer Service Note that it has a limited shelf life so it should be ordered only when needed Self Diagnostics The system performs the following self diagnostic tests e Sampling Head Voltages e Minimum Count Rate e Flow Rate e Communications between Sampling Head and ASM1000 e ADC Operation e Door Status e Detector Voltage When power is cycled on the Sampling Head or the ASM1000 each unit checks its RAM and firmware memory The Sampling Head also does a self test of its Preamplifier Am plifier and ADC Every 24 hours of operation the Sampling Head takes it self out of ser vice for several minutes and does an ADC linearization if the results exceed some hard coded limits an instrument
234. tallation before going on with this manual e Table 6 in Access Authority on page 55 e Table 7 in Handling Alarms on page 62 e Table 8 in Handling Alarms on page 62 Once that has been done you ll be able to more easily compare the factory default set tings that we ll be discussing with the specifics of your installation 43 System Operation A Guided Tour An Alpha Sentry CAM System consists of an ASM1000 Alpha Sentry Manager and from one to eight sampling heads The ASM1000 acts as the system supervisor and display for the sampling heads and is connected to the heads via a multi drop RS 485 communica tions link as shown in Figure 23 Using this link the ASM1000 sends commands to the Sampling Heads receives data such as alpha spectra and alarm conditions from the Sam pling Heads and monitors the overall health of the system Figure 23 The Alpha Sentry CAM Network The CAM Sampling Head Each Sampling Head is a complete standalone instrument that contains all of the logic it needs to e Detect alpha particles which are deposited on the filter contained in the Sampling Head using a rugged PIPS Passivated Implanted Planar Silicon detector e Acquire an energy spectrum of those particles using a built in 256 channel Multi channel Analyzer MCA e Analyze the energy spectrum to determine if an
235. tallations entries to the system registry will be required Be sure that you have administrator privileges before attempting to install the software Insert the distribution media containing the software into an appropriate media drive on your computer Depending on your computer setup the Windows Explorer may start au tomatically after inserting the media If not activate the Windows Explorer manually 151 Host Computer Interface Navigate to the drive containing the software being installed select the S579 folder and activate the SETUP EXE installer program Follow on screen instructions until the installation has completed successfully If the in stallation program s defaults are used a new group named Canberra ASM1000 will be created under the Programs section of your Start Menu The Canberra ASM1000 group will contain the newly installed software Downloading Interface Parameters 152 The ASM1000 firmware program supports certain program options that must be setup by downloading the proper parameters into the device Such options include e The configuration of the optional host interface hardware ASMO1 ASMO02 or none e The enabling or disabling of the acute alarm test during the Performance Check maintenance procedure The program options must be reloaded if a change is made to the optional host interface hardware or if the acute alarm testing during maintenance operation needs to be enabled or disabled The pro
236. te Post Command Delay Parameter C3 2C aoaaa a o 138 Read Post Command Delay Parameter D3 2C aaao aaa a 139 Write Pre Command Delay Parameter C3 2D o o o ooo o 139 Read Post Command Delay Parameter D3 20 o o oo ooo 140 Calibration Warnings QE 2 30 140 Write Calibration Frequency Parameter C32B 0 0 o ooo o 140 Read Calibration Frequency Parameter D3 2E o ooo 141 Write Warn Ahead Parameter C3 2F 2 0 ee 142 Read Warn Ahead Parameter D3 2F 2 2 o o a 142 Write Activate Trouble Light Parameter C3 30 ooo o 143 Read Activate Trouble Light Parameter D330 o 2220004 143 ASM1000 Communications Setup ee 144 System Configuranions yc ses eii eS a a kw p Eea E 146 vi Model ASMO1 RS 485 ame nmaa dananya ea a a e 146 Model ASMO2 RS 2320 a a a a a E a a a a e a 148 Field Tastallation s dv a eres e ae a a ae we a Seo oe eg eg 148 Completing the Installation s s s sone s oeeo e e ee 151 Installing the Configuration and Firmware Upgrade Software o o 151 Th S579 Sottware ae cti a aa aae a da da e ea as AA 151 Downloading Interface Parameters e 152 Algorithms c s sacie mana eee Ee naaa aaa OL Ori ilorin To n M E EE ERD EEE RY AAA 157 Enersy Calibration s 23 2 yoe sr o hb iua a a o ta e B
237. ted the next step is to place it under Man ual rather than Automatic control To do that press the Auto Manual F1 key The Status for that sampling head will then change to Man Started indicating that acquisi tion is in progress This can be seen in Figure 44 where CAM 4 has been set to Manual and is acquiring data CAM Control Status Table _Status CAM CAM CAM CAM CAM CAM CAM CAM anona on Bo Auto Manual Manual CAM View Start Clear Status Manual no Data Table SPectrm Figure 44 CAM 4 Has Been Set to Manual Control 79 System Operation Once set to Manual the sampling head is in standalone mode and is under your control not under the control of the ASM1000 Note that while the sampling head is in manual mode any alarms generated by the Head will set off the appropriate annunciators at the Head but no corresponding entry will be made in the ASM1000 s Alarm Log While in manual mode the unit will continuously calculate the CPM Concentration and DAC hr values It assumes a constant flow rate equivalent to the last flow prior to manual mode Note that no entries to the historical database will be made while in manual mode Sampling Head Operations Once the sampling head has been set to manual mode the spectrum acquisition cycle can be started and stopped and the MCA data can be cleared Viewing the Spectrum To view the spectrum currently in the sampling head s MCA memory press View Spec tr
238. ters representing the hex value of the value to be assigned to the display flag These may be either of the following 00 To clear display flag 01 To set display flag Response lt checksum gt lt EOT gt Setting the display flag improves the response to host commands by inhibiting the ASM1000 s automatic display update for the Network Display Detailed Display and Current Spectrum display The flag will be automatically reset at a logout time and b when a button is pressed on the monopanel Care should be taken so that this flag is never left set Read Limited Calculated Data2 The ReadLimitedCalculatedData2 command returns the air flow concentration and DAC hr calculations from the CAM s most recent analysis cycle The flow value is up dated every few seconds The concentration and DAC hr values are updated at the com pletion of an analysis cycle This command resets the CAM s Data Available flag Command lt address gt lt CAM gt lt 3B gt lt checksum gt lt EOT gt Response lt air flow gt lt cr gt lt concentration gt lt cr gt lt dac hr gt lt cr gt lt checksum gt lt EOT gt Parameters lt air flow gt Average air flow in L min lt concentration gt Concentration in dpm m lt dac hr gt DAC hours These values are transmitted in a floating point format Refer to Data Formats on page 107 190 Setup Interface Commands and Responses Read Flow The ReadFlow command returns the current
239. th an automatic energy recalibration which is performed every time a spectrum is analyzed The energy recalibration is based on the 7 68 MeV peak normally the most prevalent peak in the spectrum During the first analysis after a filter change the peak cannot be more than the user selectable limit of channels the default is 15 away from its expected location based on the default energy calibration If the peak is within this limit a recalibration will take place For any subsequent analysis as long as the peak is not found to be more than the user set number of channels away from its first location after a filter change and the newly calcu lated offset is less than 10 different from its previous offset the recalibration will take place Theory of Operation During the recalibration all the peaks in the spectrum will be shifted by the same amount as the 7 68 MeV peak Once the recalibration is complete the stripping algorithm is ap plied If it is determined that the 7 68 MeV peak has shifted too far for an energy recalibration due most likely to excessive filter loading the Peak Shift Excd error message will appear At this point the energy calibration will not be changed but the results will still be calculated using the previous energy calibration and the alarm condition will be noted in the alarm log 11 2 Installation Installation This chapter discusses installation of an Alpha Sentry CAM System which
240. the various ASM1000 and sampling CAM head alarm annunciators to specific alarm conditions The ASM1000 Annunciators Choosing ASM from the Alarm menu will bring you to the matrix shown in Figure 15 which defines the relationship between alarms and the annunciators Pressing a matrix button repetitively will cycle through the associated options With the exception of the Horn buttons a matrix button will show an X when the annunciator is selected and blank when is deselected The Horn buttons will cycle through the Loud Fast Soft and Slow modes in addition to blank where the Horn is deselected For example according to Figure 15 an Acute Release will light the Red Lamp but will not light the Amber Lamp The default settings shown in this figure are discussed in The Factory Defaults on page 23 33 Installation 5 A5M1000 Alarm Setup xj 4SM1000 Annunciators Red Amber Horn Exp T Screen Alarm Alam Lamp Lamp Relay Log Conditions Entry X X rouble Relay Acute Release Chronic Release xl EI acia z A e ee Cancel Help Figure 15 The ASM1000 Annunciators Going On When you have made all necessary changes press Accept button to send the new settings to the ASM1000 and exit the dialog or press Cancel to exit the dialog and discard any changes The Sampling Head Annunciators Selecting the CAM command from the Alarm menu yields the dialog box shown in Fig
241. tion to the functions outlined above the Red and Green LEDs are also used to indicate required operator actions during routine maintenance procedures such as changing the air filter and testing sampling head performance Their behavior during those procedures will be covered later in this chapter when those specific operations are described Sampling Head Connectors The Sampling Head s electrical connectors are located on the base of the unit The base can be rotated in 120 degree increments allowing the connectors to be placed in the most convenient position for installation and access Normally you won t have to be concerned with these connectors once the Sampling Head has been installed Should you need additional information refer to Chapter 2 Installa tion ALARMS Terminal Strip A six position barrier strip is used to connect external indicator lamps and or annuncia tors to the Sampling Head s alarm logic J101 CAM NETWORK Connector This is a 9 pin D type connector that is used to connect the sampling head to the RS 485 multi drop CAM network A Guided Tour J102 24V AC IN Connector Power is provided to the Sampling Head via this 3 pin DIN connector either directly from the ASM1000 local single sampling head systems only or from an external power source such as the Model AS070 Power Supply Vacuum Connection On the back of the main body of the Sampling Head you ll find a push on tubing connec tor that is use
242. tivated Performing the Efficiency Calibration For each Sampling Head that is to be calibrated the following is performed 1 Open the door to the sampling head by turning the knob counter clockwise from CLOSE to OPEN and pulling outward 2 Remove the filter cartridge and replace it with the Calibration Source then close the door and turn the knob from OPEN to CLOSE to latch it shut The MCA in the sampling head will now start counting the source The LEDs will be set to Green On and Red On to indicate that a count is in progress at the ASM1000 the Status for the sampling head will change to Counting 195 196 Maintenance 3 Wait until the count is completed which will be indicated by Red Blinking and Green 0ff then open the door remove the Calibration Source and insert a new filter cartridge if the sampling head is on the network 4 Now close the door and latch it which will end the calibration and return the sampling head to normal operation This will be indicated at the Sampling Head by the LEDs changing to Green On and Red 0ff The results of the Efficiency Calibration can be seen at the ASM1000 as shown in Fig ure 75 The Status column will contain the word Completed and the Counts and Eff values will be updated with the results of the calibration At this time these results are stored and the Filter Change Record is also updated Efficiency Calibration 3 CAM 1 za 3 4 a 6 7 E CAM Heads primed S
243. to the Upper Air Intake Housing with three flat head screws If you have the Model AS020 alarm option refer to Field Installing the Alarm Option on page 223 A CAUTION Use a maximum of 6 inch pounds 0 7 newton meter of torque Excessive force can crack the plastic Preamplifier Amplifier and Detector Removal These components are a subassembly that can be taken out without disturbing the Detec tor Shield Can 1 Loosen the three screws that secure the subassembly to the Detector Shield Can these are at the bottom of the can For the AS450 these are captive screws The AS1700 does not have captive screws the screws must be removed 2 Grasp the printed circuit board and carefully but firmly pull it out of the Detector Shield Can A CAUTION Removal or adjustment of the screws that hold the circuit board to the bracket will disturb the critical alignment between the de tector and Shield Can If the screws and circuit board must be removed replacing them requires an alignment tool which is available as part of the Model SKC1000 Service Kit 3 To remove the detector use two small wrenches to hold the gold plated connector on the board while unscrewing the detector To reassemble 4 Screw in the replacement detector finger tight then secure the detector using the two small wrenches The back surface of the detector must be tight and flat against the printed circuit board mounting bracket 5 Press the sub assemb
244. ts channel 255 213 counts Read Last Alarm Spectral Info 39 This command reads the Alarm acute release chronic release no spectral data or high background that caused the spectral data to be saved and its time date stamp The calculated data values for this spectrum can be read with the Read Complete Calcu lated Data Command page 118 specifying the Alarm cycle A The spectral data can be read with the Read Spectral Data Command page 131 specify ing the Alarm cycle A Command lt AAC gt lt 39 gt lt checksum gt lt EOT gt Parameter AA RS 485 address hex of ASM1000 RS 232C 00 C CAM number 39 alarm spectral info command 133 Host Computer Interface Response lt alarm gt lt cr gt lt alarm date gt lt cr gt lt alarm time gt lt cr gt lt checksum gt lt EOT gt Size 27 bytes Parameter alarm alarm type binary format 2 byte bit 0 acute release bit 1 chronic release bit 2 not used bit 3 not used bit 4 not used bit 5 not used bit 6 not used bit 7 not used bit 8 no spectral data bit 9 not used bit 10 high background bit 11 not used bit 12 not used bit 13 not used bit 14 not used bit 15 not used alarm date alarm time stamp date date format alarm time alarm time stamp time time format Acute Alarm 29 These commands read and write to the Acute Limit Multiplier for a specified CAM Sup ported in Version V2 12 and up Write Acute Limit Multiplier C3 29
245. tually occurring each sampling head has its own value for n which can range from 1 to 235 Restoring the Network Once you have completed the external setup the following procedure is used to exit the program You can leave the computer connected and the program running without af fecting the ASM1000 s operation 1 From the main menu select Exit in the menu bar 2 A confirming dialog box will then pop up Press Yes to exit the program or No to return to the main menu screen 3 Once you ve exited the program remove the cable that connects the computer to the ASM1000 4 If you re not using a local serial printer you ve finished your setup 5 If you are using a local serial printer you ll need to do the following A Reconnect it to the ASM1000 B Use the procedure described in Setting the ASM1000 s Communica tions Parameters on page 30 to change the Communication Parameters back to the settings used by your serial printer Setup Commands For a listing of all commands available for setting the Alpha Sentry system parameters including additional commands not supported by the Model S578 Alpha Sentry PC Setup software refer to Setup Command Protocol on page 172 42 What You Need to Do First 3 System Operation This chapter of the Alpha Sentry CAM User s Manual is designed to familiarize the reader with the operation of the ASM1000 Alpha Sentry Manager and its sampling heads It begins with a
246. udes a multichannel analyzer are used to collect and store the alpha spectra Figure 1 shows a cross section diagram of the sampling head The ASM1000 provides the operator interface for up to eight of these sampling heads It consists of an LCD display and a pushbutton front panel housed in a rugged metal case Its function in the system is to periodically read out the spectrum from each sampling head at a time interval selected by the user apply a sophisticated background stripping algorithm and determine the occurrence of a chronic release A discussion of how the system determines the acute and chronic releases and how it performs background stripping is described in the next section Theory of Operation For a more technical discussion refer to Appendix A Algorithms Introduction 360 Inlet Screen Preamp Uniformation Orifices Filter Drawer i Filter Sensor gacacga CJ Figure 1 Cross Section of a Sampling Head Theory of Operation This section of the manual is intended to give you an idea of what s going on behind the scenes in the Alpha Sentry System It discusses the operating philosophy of the Alpha Sentry System the determination of release alarms the physics behind the radon rejec tion screen the stripping algorithm and the automatic energy r
247. um F5 which will generate a display like the one in Figure 45 You ll note that this is the data that was displayed when we used the Current display choice for viewing sam pling head data back in Viewing Sampling Head Data on page 72 For a description of the various items which are being displayed refer to Viewing the Data on page 73 CAM 1 Current Spectrum 24 E i 2 3 4 5 6 7 Hey Elap Timetmin 47 D C hrs CFH 1 3 Error Status Man Started uCirmL Alarm Auta Manual Manual CAN Start Clear Status Manual SEDE Dats Table Spectrm Figure 45 Viewing the CAM s Spectrum Controlling a Sampling Head Manual Start Stop To manually Start or Stop the sampling head s data acquisition press the Manual Start Stop F2 button This will toggle the data collection on and off and change the Status display from Man Started to Man Stopped or vice versa A sampling head that has been manually stopped will show a No Data Collect alarm Manual Clear Data To clear the data in the sampling head s MCA press the Manual Clear Data F3 but ton Doing that will reset all of the channels in the sampling head s MCA to zero counts and the elapsed count time to zero minutes If you press this button while the sampling head is acquiring data the following should be noted 1 Acquisition is not stopped all data is reset to zero and acquisition continues 2 You may not actually see the data change to
248. um of any other three adja cent channels An instrument alarm will be issued and an alarm log entry will be made if Spectrum Analysis a In the first spectrum after a filter change the actual location of the 7 68 MeV peak is 15 or more channels away from the expected location based on the default energy calibration or b In any subsequent spectrum after a filter change excluding the first one the location of the 7 68 MeV peak is 15 channels or more away from where it was observed for the first spectrum after the filter change and the new offset calculated from its location is less than 10 different from the previous spectrum Background Compensation For the purpose of calculating the plutonium net area in a CAM System let us first con sider a typical spectrum as illustrated in Figure 72 Region 3 Region 2 Region 4 Lee Xo 150 X3 200 Figure 72 Typical CAM Spectrum The symbols shown in the figure are defined as Xo is the beginning of the meaningful spectrum region X is the valley channel between the plutonium region and the 6 05 MeV back ground peak X the valley channel between the 6 05 MeV peak and the 7 68 MeV peak X is the valley channel between the 7 68 MeV peak and the 8 78 MeV peak and X the last channel in the spectrum 161 Algorithms Spectrum Regions The spectrum is thus divided into five regions Region 0 below the beginning of the meaningful spectrum p
249. ure 16 which is used to configure the annunciators that are located on the sampling heads It operates in the same way as the ASM1000 Annunciator dialog box we just dis cussed and the settings shown in Figure 16 are the Factory Defaults described in Ta ble 5 Sampling Head Annunciators on page 26 Changes to the table are loaded into the ASM1000 which downloads it to all attached sampling heads If a Head is added to the network the ASM1000 will send it the current table 34 The Security System ig CAM Alarm Setup xi CAM Annunciators A Lamp Horn Exp Trouble arm Conditions Relay Relay Acute E Release x Fast High Background Instrument Fault TT 9 Alarm H H Accept Cancel Figure 16 The Sampling Head Annunciators ao ES ar The Security System The Security System is the means by which unauthorized personnel are kept from enter ing the system It is composed of four Access Levels each requiring an Access Code which are assigned to the various menu functions To see how the Security System works let s look at an example security system setup In this example laboratory there are four different classes of personnel who will be working with the Alpha Sentry system 1 Personnel who will be making filter changes and doing performance checks 2 Personnel who are responsible for calibrating the system 3 Personnel who need to access the system s spectra and database 4 Pers
250. us Parameters Screen Altitude The altitude of your installation in feet above mean sea level is used for calibrating the Flow Rate metering subsystem The allow able range is from 0 to 14 999 feet Temperature The average ambient temperature of your installation in degrees Kelvin is also used for calibrating the Flow Rate metering subsys tem The allowable range is from 0 to 999 K Log In This is the setting for the automatic Login Logout timer described Timeout in Login and Logout on page 54 The allowable range is from 0 to 99 minutes Entering O disables the automatic logout LCD This is the setting for the LCD Backlight timer described earlier in Backlight Controls and Indicators on page 48 The allowable range is from Timeout 0 to 99 minutes Entering 0 disables the LCD backlight timeout 101 System Operation Frequency This setting tells the ASM1000 the expected calibration frequency days This values is expressed in days and is used internally in conjunc tion with the CAM s last calibration date to calculate the CAM s next calibration date Entering zero in this field will disable the cal ibration warnings Valid entries are 0 through 9999 days For com patibility with previous ASM1000 versions the initial default will be zero Warn Ahead This setting tells the ASM1000 how far ahead before any of the weeks CAMs calibration is due to start posting calibration due messages to the operator This
251. using a factor x10 will provide an equivalent sensitivity for uranium because of the order of magnitude difference in the DAC definition between the two elements The factory default is 1 The Acute Alarm Count Interval Figure 22 is selected through the ASM1000 s human interface and determines the frequency at which the Sampling Head checks for Acute Alarm condition This parameter has a factory default setting of 30 seconds and can be set by the user through the ASM1000 s System Setup Param Setup Alarms screen Acceptable values range from 6 seconds to 1530 seconds Alarm Parameters Al Limit Alarm Method DAC Limit CAMH 1 8 80 Low Flow cfm High Flow cfm Confidence Level sigma DAC Factor 2 Upper Energy Limit MeV Analysis Window MeV Count Cycle min Acute Interval sec Alarms CAM Figure 22 The Alarm Parameters Number of Consecutive No Counts To insure that the sampling heads are operating correctly the ASM1000 tests each sam pling head at the end of every counting cycle to see if any data counts have been accumu lated in the transuranic portion of the spectrum 41 Installation If a given sampling head has no counts for n consecutive counting cycles that sampling head is declared to be defective and an Instrument Fault class alarm is triggered Since the local background and the amount of local air filtering have a major impact on the probability of a No Counts condition ac
252. val Our warranty does not cover detector damage due to neutrons or heavy charged particles Failure of beryllium carbon composite or polymer windows or of windowless detectors caused by physical or chemical damage from the environment is not covered by warranty We are not responsible for damage sustained in transit You should examine shipments upon receipt for evidence of damage caused in transit If damage is found notify us and the carrier immediately Keep all packages materials and documents including the freight bill invoice and packing list When purchasing our software you have purchased a license to use the software not the software itself Because title to the software remains with us you may not sell distribute or otherwise transfer the software This license allows you to use the software on only one computer at a time You must get our written permission for any exception to this limited license BACKUP COPIES Our software is protected by United States Copyright Law and by International Copyright Treaties You have our express permission to make one archival copy of the software for backup protection You may not copy our software or any part of it for any other purpose Revised 1 Apr 03 Notes 11S y9940 yoo youd wo UOISIOA AeH Eg dure 1seL Mold dieH Serq ay AOUSIOIYA 1era d L pual WYO Josing puoi AJOJSIH WYO WYO Buoo jeq PPY ony unipoeds eJeg eap dois ueis yenuey MOlA enuen enuen joy FINO queu
253. valid Date You have entered an erroneous date i e greater than 31 for a day or greater than 12 for a month Check your entry for validity and re enter Invalid Time You have entered an erroneous time i e greater than 24 for hours or greater than 60 for minutes Check your entry for validity and re enter Invalid Access Code The access code you have entered is not valid for the function you are attempting to perform Access Code Required The function you are attempting requires an access code Must be gt 5 min You entered a count cycle time that is less than 5 minutes It must be equal to or greater than 5 minutes CAM Not Available You have attempted to access a sampling head that is not on the network You can view the available sampling heads from the main Network Display or through the Network Configuration function under System Setup No CAM Response No sampling heads were detected upon power up or auto configuration Check con nections and try again Check System Time Upon power up the ASM1000 shows a date that is earlier than the last entered system date This indicates a battery backed RAM problem i e the system lost the date and reverts back to Jan 1 1980 CAM Already Added You are attempting to add a sampling head that is already on the network Make sure that the cursor is positioned on the correct sampling head you wish to add and try again Information and Error Messages CAM
254. value is expressed in weeks Valid entries are O through 255 weeks Activate This setting tells the ASM1000 whether to activate the Trouble Trouble light Yellow light when the calibration due message is issued Light The light will be active for the duration of the message When the message is removed the light is turned off This feature bypasses the ASM1000 s annunciator table since its occurrence is not con sidered a alarm condition CAM Offline This field accepts entries from 0 through 28800 seconds in multi Retry ples of 10 second increments A non zero entry represents the fre Flow Alarm Inhibits Cycle quency in seconds at which the ASM1000 will attempt to automatically reattach CAM s that were previously on line then dropped off line such as the result of a power glitch CAM s in tentionally deleted by the operator through the menu s Delete CAM function will not be reattached Entering 0 disables the automatic rescan Under normal operation the ASM1000 will inhibit the analysis of data at the end of a count cycle if a low or high flow alarm is pend ing The reason for this is to prevent the contamination of the his torical database with potentially bad data as result of poor air flow Under certain circumstances however it may be desirable to per form data analysis even under such abnormal conditions For such cases select no Factory default value is yes Selection will be stored in battery backed memor
255. vel T is the time since the filter was changed Ap T is the plutonium area observed at time T The High Background Alarm The high background alarm is set to TRUE if J N 8 78 N 568 N 605 Ve Zac K Te T k L gt 0 22 171 Technical Reference B Technical Reference This appendix includes information on the Setup Command Protocol and the Laptop In terface Commands and their responses Setup Command Protocol 172 The Alpha Sentry System is equipped with a standard RS 232 Interface on J102 allowing a computer to set up the ASM1000 s parameters such as the menu passwords menu pro tection alarm annunciator templates and analysis parameters Setup commands are supported by both the standard RS 232 interface hardware at J102 and the optional host interface hardware on J103 The host interface commands however are supported only by the optional host interface hardware on J103 The setup command protocol is identical to that of the optional host interface described in Chapter 4 Host Computer Interface For a complete description of the Command and Response protocols refer to Command Protocol on page 108 and Response Pro tocol on page 108 Interfacing details for J103 are given in ASM1000 Communication Setup on page 144 and for J102 in RS 232 Connections on page 20 In all cases unless specifically noted command parameters and data are separated with a ASCII carriage retu
256. vided with the ASM1000 WARNING Lethal power is present inside the unit Turn off the ASM1000 s power and disconnect its power cord before opening the unit 1 Remove the two Phillips head screws on either side of the chassis Removing these will allow the top cover to be lifted away from the chassis 2 This will expose six Phillips pan head screws that secure the LCD Keyboard to the chassis 3 Remove these screws and carefully lift the LCD Keyboard noting placement of the grounding loop from the keyboard on the left side 4 Rest the LCD Keyboard assembly facing down on the right side of the ASM1000 Be sure to rest the assembly on a soft surface such as cloth to protect the LCD s glass surface Also be sure to keep the assembly as close to the ASM1000 as possible to prevent excessive strain on the interconnecting cables Use a spacer such as a book to lift the LCD Keyboard assembly if necessary Field Installation Next remove the plate covering the cut out for J103 Save the screws and plate 5 Ifyou are installing the ASMO2 go to step 6 For the ASMO1 the board with 9 pin connector position the board in the J103 cut out with components up then fasten 1t to the chassis using the screws that were removed with the cover plate 6 If you are installing the ASMO2 the board with 25 pin connector the two threaded inserts must be removed from this connector You will need a 3 16 inch nut driver Position the board in the J10
257. vity Data Count Cycle and Air Flow Radioactivity Data The first three entries in the column to the right of the bar graphs contain information on the radioactivity data for this sampling head All three items DAC hrs Concentration and CPM Counts per Minute are as of the most recently completed Count Cycle Note that the Concentration value reported on your sampling heads may be in different units than the example here As we ll see later in Modifying the System s Parameters on page 93 both the units for the activity of the radiation and the volume for the Concen tration calculation can be set over a wide range of choices Because of this your system may be reporting the Concentration in pCi mL Bq cm and so forth Count Cycle To determine just how old that data is or how long you II have to wait for updated values look at the Count Cycle entry Here you ll see both the elapsed time and the preset counting time in minutes for the current counting cycle For example if the entry states 12 30 this tells you that the release data is 12 minutes old and that in 18 more minutes 30 12 18 new values will be computed and displayed and the DAC hr bar graph updated Air Flow The Air Flow value shown is a real time reading of the sampling head s air flow Depending upon the reporting units that were selected for your system it will be displayed in either cfm cubic feet per minute or L min liters per minute
258. which also enables the Security System This is done with the dialog box shown in Fig ure 18 which is reached by selecting Codes from the Security menu 37 Installation 5 Security Access Codes Access Code Digit Length 0 9 3 Access Level 1 Access Level 2 Access Level 3 975 Access Level 4 456 Cancel Help Figure 18 The Security Access Code Dialog Access Code Digit Length The first thing to enter is the maximum length of the Access Codes In our sample case a value of 3 was used as shown in Figure 19 The Access Codes Using our example again enter the Access Code range 100 to 199 for Level 1 650 to 699 for Level 2 925 to 975 for Level 3 and 456 to 456 for Level 4 Your screen will now look similar to Figure 19 Note that for Level 4 since only one Access Code 456 is to be allowed the same value must be entered for both entries ig Security Access Codes Access Code Digit Length 0 51 3 Access Level 1 199 Access Level 2 6399 Access Level 3 975 Access Level 4 456 Cancel Help Figure 19 Assigning Access Codes 38 Entering the CAM ID Labels Completing the Operation When you have finished changing the security parameters you can press Accept button to send the new settings to the ASM1000 and exit the dialog or press Cancel to exit the dialog and discard any changes Entering the CAM ID Labels The ASM1000 allows a descriptive phrase of up to 39 characters to be
259. y After you ve made all necessary changes you can return to the Network Display or De tailed Display by pressing either NETWORK DISPLAY or DETAILED DISPLAY To enter one of the other parameter setup screens press the appropriately labeled function key Calibration Due Messages The calibration due message consists of a dialog box which is posted every 12 hours at noon and at midnight once the ASM1000 determines that one of the on line CAMs re quires calibration based on its calibration due date and the selected warn ahead time 102 Modifying the System s Parameters The calibration message includes each CAM s last calibration date plus the CAM s cur rent calibration status The status is as follows N A CAM not on line Ok CAM s next calibration due date is higher than the current date and falls outside the selected warning period Due on CAM s next calibration due date is on ddmmmyy ddmmmyy Was due on CAMs calibration due date is already passed Was due on ddmmmyy ddmmmyy The ASM1000 determines the CAM s next calibration due date by adding the calibration frequency value to the CAM s last calibration date The date at which the warnings begin is calculated by subtracting the warning ahead time from the CAM s next calibration due date and if the result is less than the current time then the warnings will be issued on the next 12 hour interval The CAM s calibration due date is re established by the ASM1000
260. y the active Green Count LED 3 Repeat this process for any additional sampling heads that are to be placed back into service When you re finished press Network Display Each time you add a sampling head to the network the ASM1000 will test the sampling head to insure that it s there and communicating properly If it s not there or not commu nicating properly the message No CAM Response will be displayed Press any key to acknowledge the message then correct the problem or select a different sampling head and try Add CAM again If it is there it will add the sampling head assuming a filter change 61 System Operation Using the New Configuration When you re finished configuring the Network press NETWORK DISPLAY to return to the Network Display and resume monitoring with the new configuration Handling Alarms In this section we ll be taking a look at the types of alarms that the Alpha Sentry CAM System can generate and see how they are handled For this discussion we ll be assuming the Factory Default settings for the various pro grammable alarm parameters However Alarm Handling like the Security Access Code subsystem can be tailored by the System Manager to the specific requirements of a given installation This means that the exact procedures used in your installation may differ from those described here ASM1000 Annunciator Settings Table 7 shows the factory defaults for the ASM1000 annunciators Table 8

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