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Technical Reference Manual

1. Procedure 55 To set mass flow Ti From the Main menu select Initial setup 2 From the Initial setup menu select Process parameters 3 From the Process parameters menu select Process units 4 From the Process units menu select the proper density units 5 Move back to the Process parameters menu and select Spans 6 From the Spans menu select Process span 7 Enter the span for the density of the process material 8 If the measurement is Solids setup the proper product and carrier densities refer to the Percent Solid or Percent Solution Indication section of the manual page 136 9 Move back to the Initial setup menu and select Auxiliary input 10 From Auxiliary input menu select Compensation 11 Select the Type menu select Mass Flow 12 Move back to the Compensation menu select Mass Flow 13 Press F4 to enter 14 From the Mass Flow menu select Flow Meter Unit 15 In the Flow Meter Unit screen select the proper units of the flow meter Press 116 DSGH Technical Reference Manual 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Special Applications F4 to enter From the Mass Flow menu select Min Flow Value and then the Max Flow Value menus and enter the span for the flow meter From the Mass Flow menu select the Min Mass Flow and Max Mass Flow to view the mass flow range This is the allowable setting for the current loop span Procedure
2. Be mea Initial settings and calibration requirements To use the DSGH as a degrees Twaddle indicator it must have specific settings in the Initial setup screens and proper calibration Refer to these sections of this manual for more details Table 33 Reference table for Initial Setup and calibration requirements degrees Twaddle Setting Manual heading Page Set units as degrees Twaddle Units 82 Set process span Min density Max density with the appropriate Span settings process span 88 values in degrees Twaddle units Calibrate on low density Set low density 45 Calibrate on high density Set high density 46 Set current loop span 4 mA density 20 mA density with the Span settings current loop span 88 appropriate values in degrees Twaddle units DSGH Technical Reference Manual 139 Special Units Indication Degrees Baume indication The DSGH can be set up to indicate degrees Baume by choosing Be It Baume light or Be hv Baume heavy in the Process units screen from the Initial setup Process parameters menus Use Baume light for liquids or solutions less than 1 0 SpG Use Baume heavy for liquids or solutions greater than 1 0 SpG The DSGH directly measures only the total mass in the volume between the detector and source holder This is equivalent to a direct measurement of density mass volume since the volume remains constant When the DSGH indicates degrees Baume it is indicating a derived quantity The DSTG
3. Relay COUNTS Figure 21 CPU board and power supply board simplified component layout DSGH Technical Reference Manual 73 Diagnostics and Repair Test points Test points are located on the power supply and CPU board Table 8 lists and describes the power supply board test point labels Table 8 Power supply board test point labels and descriptions Power supply board test point Description label H1 HART connection H2 HART connection TP1 Isolated ground TP2 Loop current test point 200mV mA loop current Referenced to isolated ground Table 9 lists and describes the CPU test point labels Table 9 CPU test point labels and descriptions CPU test point label Description Count Raw input signal coming from preamp GND Logic ground U5 pin 8 5V power supply test points referenced to Logic ground Jumpers Jumpers JP1 and JP2 on the power supply board set the current loop source or sink mode Do not change the jumpers from the current setting without consulting VEGA Field Service The jumpers for the current loop power source or sink mode are set as follows Table 10 Jumper settings Mode Jumper setting Source mode DSGH current loop is self powered JP1 1 2 JP2 2 3 Sink mode DSGH current loop is DCS powered JP1 2 3 JP2 1 2 The DSGH does not use jumpers J1 J4 on the CPU board 74 DSGH Technical Reference Manual Diagnostics and Repair LED indicators Check the basic functioning of the DSGH at the instr
4. 86 DSGH Technical Reference Manual Initial Factory Setup With the RC exponential method the damping entry is equivalent to a time constant that is the amount of time in seconds that it takes for the gauge reading to achieve 63 2 of a step change in process A range of integer values from 1 600 seconds is possible for this time constant entry With the rectangular window filtering the damping entry determines how many samples to use when calculating the average responding to 100 of a process step change The maximum damping entry is 100 with this type of filtering Fast response cutoff Fast response cutoff temporarily bypasses the RC or digital filtering when the change in process exceeds this value in engineering units between successive samples This enables the DSGH to respond immediately to large step changes while filtering the smaller variations in the signal caused by noise and normal process variations To turn off the fast cutoff filter set the value to zero Selecting a filter type damping and fast cutoff Procedure 35 Selecting a filter type damping and fast cutoff 1 From the Main menu select Initial setup 2 From the Initial setup menu select Process parameters 3 From the Process parameters menu select Filtering 4 From the Filtering menu select Filter type 5 On the Filter type screen the currently used filter type is shown as either RC Exp Filter or Rect Window Filter To change the filter type
5. COM 10 O 6V 11 0 Aux 12 O Aux 13 O mA 14 O mA Figure 14 Terminal connections Table 4 Terminal names and descriptions Termina Name Description l 1 L1 AC or DC power input 2 L2 AC or DC power input 3 RYNO Relay normally open 4 RYC Relay common 5 RYNC Relay normally closed 6 Freq Not used in HART applications 7 Freq Not used in HART applications 8 6 Auxiliary input power 9 COM Auxiliary input power common 10 6 Auxiliary input power 11 Aux Auxiliary input frequency signal 12 Aux Auxiliary input frequency signal 13 mA Positive current loop output 14 mA Negative current loop output Note The power input terminals are not polarity sensitive DSGH Technical Reference Manual 33 Installation Power CAUTION DO NOT APPLY POWER until a thorough check of all the wiring is complete The AC power source voltage input is 100 230VAC 10 90 250VAC at 50 60 Hz at 15VA maximum power consumption Do not share AC power with transient producing loads The DC power source voltage input is 20 60VDC less than 100mV 1 1 000 Hz ripple at 15VA maximum power consumption DC power cable can be part of a single cable 4 wire hookup or can be separate from output signal cable See Output current loop section Use wire between 14 22AWG 1 63 to 0 643mm for power wiring Switch for CE compliance For CE compliance install a power line switch no more tha
6. When prompted enter the value of the new temperature you wish to force The transmitter continues functioning in Temperature test mode until it times out after one hour or until you choose Exit Temp test mode Exit temperature test mode Procedure 23 To exit the Temperature test mode From the Advanced Fxns menu select Test mode From the Test mode menu select Temp test mode From the Temp test mode menu select Exit Temp test mode At the prompt select Yes to exit the test mode Other advanced functions Checking the sensor voltage poll address equipment version serial numbers and temperature coefficients When performing diagnostics it may be important to know the following information Sensor voltage Poll address Version of firmware on the FLASH is installed on the DSGH Hardware version number Equipment serial numbers Temperature coefficients Sensor voltage Displays the sensor voltage Poll address This function displays the HART poll address of the transmitter Each transmitter in a current loop must have a unique poll address This value is meaningful only when multiple transmitters connect on the same loop Firmware version Displays the firmware version number Hardware version 62 DSGH Technical Reference Manual Displays the hardware version number CPU serial number Displays the CPU serial number Sensor serial number Displays the sensor serial number View temperature coefficien
7. mass flow measurement 119 Max density displayed in process chain 58 Max Density entry in initial setup 94 Message user defined in System information 100 milliamp output test mode 61 Min density displayed in process chain 58 148 Min Density entry in initial setup 94 Min Max history 59 N New hardware advanced function 60 New hardware found alarm acknowledge 73 alarm setup 101 diagnostics check 73 in diagnostic history 75 New hardware found message responses to 60 Next wipe shutter check due 99 No device found message 79 non linear table 147 O Ohmview 2000 20 one point calibration 46 P percent count range 57 percent process span 57 percent solid 141 percent solution 141 poll address 65 Poll address 65 Primary channel 56 process alarm 74 override switch 74 setting relay as 104 Process alarm 69 Process chain 56 Process out of measurement range alarm setup 101 Process out of range alarm acknowledge 73 diagnostics check 73 in diagnostic history 76 Process standardize type 90 Process temperature coefficients 114 Process variables 58 PV process value 57 R RAM corrupt alarm acknowledge 73 alarm setup 101 in diagnostic history 75 RAM status diagnostics check 73 Raw counts 56 Raw density 57 Real time clock fail alarm acknowledge 73 alarm setup 101 in diagnostic history 75 DSGH Technical Reference Manual Real time clock test diagnostics check 73
8. Enable the RS 485 local network using the configuration program continuous communication starts 14 Continue to monitor the RS 485 network to verify that all of the gauges are responding as expected and that the relay is not in an alarm condition 132 DSGH Technical Reference Manual Special Applications Procedure 60 To set up the GEN2000 RS 485 local network continued 15 For each gauge on the RS 485 local network e Use the RS 485 Configuration software to configure the Responder table To Change data 1 Select Function 2 Click On any Function cell 3 Press Accept Function Unit Function x Unit 1 Notused Not Used Unit 2 Not used Summation Unit 3 Auto Zero y apor Comp Unit 4 temal Summ Unit 5 Not used Unit 6 Not used Unit 7 Summation ADD 7_TOP Unit 8 Not used Unit 9 Not used Unit 10 Not used Unit 11 Unit 12 Not used Unit 13 Not used Unit 14 Not used Unit 15 Vaper comp ADD 15 AcceptFunction MainScreen e Verify that the Responder table contains all of the units required for the particular gauge e Verify the Responder table is updating Responder Communication 15 xj Connected to Responder Tag Number ADD 16 Communication Read Only Address 16 RS 485 Master X Pol Staas ira 2 court Tools Jomiy Regiei Gauges a F M Ponti Une m lure 3 00 ical F r No Check Box Selected E ano7 ToP F P 3 pon F F r r Ure 15 r Mar cmen 16 Connect to e
9. FAX 513 272 0133 Website www vega americas com DSGH Technical Reference Manual WARNING Use this equipment only in the manner that this manual describes If the equipment is not used per VEGA specifications the unit is not CE compliant and may be damaged or cause personal injury Preface NOTES 2 DSGH Technical Reference Manual Contents Revision history 1 Explanation of symbols 11 CHAPTER 1 INTRODUCTION 13 Nuclear materials notice 13 Unpacking the equipment 14 Storing the equipment 15 Certifications 15 Specifications 17 Typical applications 18 System overview 18 Principle of operation 21 Communicating with the gauge 21 Using a universal hand held terminal 21 Using VEGA View software on a PC 23 Using Ohmview 2000 Software on a PC 24 The HART screens menu structure 26 CHAPTER 2 INSTALLATION 27 Testing on the bench 27 Location considerations 28 Mounting the measuring assembly 30 Wiring the equipment 31 Power 34 Output current loop 34 Communication 34 Process alarm override switch 34 Conduit 35 Commissioning the gauge 35 Can you remove the source holder lock 35 Field service commissioning call checklist 36 CHAPTER 3 CALIBRATION 38 Current loop analog output calibration 39 Preparing for calibration 42 Choosing the linearizer type 43 Equation 43 Table non linear 43 Table linear 44 Recommended two point calibration 45 When is a new calibration necessary 48 Periodic
10. How we can contact you optional if you prefer to remain anonymous Name Title Company Address Did you find errors in this manual If so specify the error and page number Did you find this manual understandable usable and well organized Please make suggestions for improvement Was information you needed or would find helpful not in this manual Please specify Please send this page to VEGA Americas Inc Director of Engineering 4241 Allendorf Drive Cincinnati OH 45209 1599 12 DSGH Technical Reference Manual Introduction Chapter 1 Introduction Nuclear materials notice This equipment contains radioactive source material that emits gamma radiation Gamma radiation is a form of high energy electromagnetic radiation Only persons with a specific license from the U S NRC or other regulating body may perform the following to the source holder Dismantle Install Maintain Relocate Repair Test VEGA Field Service engineers have the specific license to install and commission nuclear gauges and can instruct you in the safe operation of your density gauge To contact VEGA Field Service call 513 272 0131 Users outside the U S and Canada may contact their local representative for parts and service Note Special instructions concerning your source holder are found in the envelope that was shipped with the source holder and the Radiation Safety for U S General and Specific Licensee
11. it has not been set up to do so or is not on the network Figure 38 RS 485 Responder gauge data screen Responder Communication a 5 x Connected to Responder Tag Number ADD 15 Communication Read Only Address 15 G 3 3 RS 485 Master m Poll Status i Required Gauges Ly C All Possible Fl s None L a ae r Fault Status Description No Check Box Selected r Unit 7 11 2 ApD7_TOPI Unit 8 LI Unit 9 LI Unit 10 oO Unit 11 33 7 Unit 12 m Unit 13 Cc Unit 14 m Unit 15 C MainScreen 126 DSGH Technical Reference Manual Special Applications Responder Function Use this screen to select the function for different units RA122900 TESTGAGE Figure 39 RS 485 Responder Function screen The functions available for each responder are e Not Used e Summation e Vapor Comp e Auto Zero e External Summation DSGH Technical Reference Manual 127 Special Applications To Change data p 1 Select Function 2 Click On any Function cell 3 Press Accept Function Not used Not Used Unit 2 Not used pena Unit 3 Auto Zero Atte Zero Unit 4 Not used ER Unit5 Not used Unit 6 Not used Unit 7 Summation ADD7_TOP Unit 8 Not used Unit 9 Not used Not used Not used Unit 13 Not used Unit 14 Not used Unit 15 Vaper comp ADD 15 AcceptFunction MainScreen Figure 40 Responder function pull down menu To chan
12. re calibration See standardization Record shutter check 99 Record wipe 99 Reference temperature 114 Relay 103 Relay action limit High limit alarm setup 103 Relay action limit Low limit alarm setup 103 relay settings diagnostic alarm 102 process alarm 104 x ray alarm 107 Relay test mode 64 repairs material return authorization MRA number 85 returning equipment to VEGA 85 RS 485 Communication Statistics 134 Master configuration 135 responder function 134 Responder menu 136 RS 485 Network 140 responder function 133 responder gauge data 132 setting up 137 RS 485 network wiring 130 RS 485 software 130 RTD platinum 100 coefficients 117 S SD source decay counts 56 Select gage location 67 Select gage type 66 Select gauge type 66 Sensor counts 56 Sensor EEPROM corrupt 60 61 alarm acknowledge 73 alarm setup 101 in diagnostic history 75 Sensor EEPROM status diagnostics check 73 sensor fail in diagnostic history 75 Sensor fail alarm acknowledge 73 Sensor high voltage fail alarm acknowledge 73 Sensor serial number 65 Sensor status diagnostics check 73 sensor temp probe alarm acknowledge 73 Sensor temp probe test diagnostics check 73 sensor temperature alarm setup 101 in diagnostic history 75 Sensor test mode 62 sensor voltage 65 Sensor voltage 65 DSGH Technical Reference Manual Index Sensor voltage out of spec in diagnostic history 76 Sensor vol
13. select either RC Exp Filter or Rect Window Filter Press F4 to enter 6 From the Filtering menu select Damping 7 From the Damping screen enter the damping desired and F4 to enter Refer to the help screens F1 or page 85 in this manual for details 8 From the Filtering menu select Fast cutoff 9 From the Fast cutoff screen enter the cutoff value desired and press F4 to enter Refer to the help screens F1 or page 85 in this manual for details Note To turn off Fast cutoff enter 0 as the value 10 If using a hand held HART Communicator press F2 to send the updated filtering parameters to the transmitter DSGH Technical Reference Manual 87 Initial Factory Setup Span settings The spans for the process current loop and any optional auxiliary input are set in the Spans screen from the Initial setup Process parameters menus Process span Process span is the anticipated lowest and highest density Min and Max Density measurement with the gauge The DSGH calibrates within these settings These define the endpoints for the calibration and linearizer curve This does not define the span for the output current loop Refer to the Current Loop Span procedure in this section Note The Min and Max density values for the process span are essential to proper calibration of the system You must enter the Min and Max density for process span before you perform a calibration You must perform a new calibration procedure if
14. 110 Test modes 61 Threshold 105 alarm setup 106 Time 96 time and date failure after extended power down 96 re set if extended power down 27 73 Twaddle See degrees Twaddle U Uncompensated Density 57 Uniformity gain 58 V VEGA Field Service 13 84 VEGA Parts and Repairs 82 150 VEGA View 20 VEGA View software differences with communicator 22 24 VEGA View Software 22 23 version numbers 65 Vessel inner diameter 98 View settings screen 40 W Warning cal span 90 Wipe interval 99 X x ray alarm 74 setting parameters 106 setting relay as 107 X ray alarm 69 Z zero counts 74 DSGH Technical Reference Manual VEGA VEGA Americas Inc 4170 Rosslyn Drive Cincinnati Ohio 45209 USA Phone 1 513 272 0131 Fax 1 513 272 0133 E mail americas vega com www vega americas com All statements concerning scope of delivery application practical use and operating conditions of the sensors and processing systems correspond to the information available at the time of printing VEGA Americas Inc Cincinnati Ohio USA 2011 Subject to change without prior notice 31399 US 140516
15. 56 To set mass flow continued Press the LEFT ARROW until you are back at the Initial setup menu From the Initial setup menu select Process parameters From the Process parameters menu select Spans From the Spans menu select Current loop span From the Current loop span menu select 4 mA Density and then 20 mA Density to enter the mass flow span Press F4 to enter and F2 to send to the hand held communicator Calibrate the gauge following the procedure specified in the Calibration section of the manual page 38 Either press the HOT KEY on the hand held HART communicator to move directly to the Process chain menu or press the LEFT ARROW to go back to the Main menu From the Main menu select Advanced Fxns From the Advanced Fxns menu select Process chain From the Process chain menu select Flow Rate Verify the correct flow meter reading from the Flow Rate menu Press F4 to exit From the Process chain menu select Mass Flow Verify the correct mass flow output from the Mass flow menu The current loop output corresponds to this mass flow output value Press F4 to exit DSGH Technical Reference Manual 117 Special Applications Table 27 Flow rate unit to mass flow unit User Selected Flow Rate Units Mass Flow Units Liter sec kg sec m3 sec kg sec m3 min kg min m3 hr kg hr Gal sec ft3 sec lb sec Gal min ft3 min Ib min Gal hr ft3 hr Ton hr Mass flow parameters Refer to the pr
16. DSGH Technical Reference Manual Installation Conduit Conduit runs must be continuous and you must provide protection to prevent conduit moisture condensation from dripping into any of the housings or junction boxes Use sealant in the conduit or arrange the runs so that they are below the entries to the housings and use weep holes where permitted You must use a conduit seal off in the proximity of the housing when the location is in a hazardous area Requirements for the actual distance must be in accordance with local code If you use only one conduit hub plug the other conduit hub to prevent the entry of dirt and moisture Commissioning the gauge The process of commissioning the gauge includes the following e Taking appropriate radiation field tests e Checking the pre programmed setup parameters e Calibrating on process e Verifying the working of the gauge VEGA Field Service Engineers typically commission the gauge It is necessary to remove the source holder lock the first time the gauge takes measurements in the field Only persons with a specific license from the U S NRC Agreement State or other appropriate nuclear regulatory body may remove the source holder lock Note this does not apply if you are using a low activity source holder such as the SHGL and handling the equipment Note Users outside the U S must comply with the appropriate 4 nuclear regulatory body regulations in matters pertaining to licens
17. P Coeff1 is the linear term For a linear response only Po and P are needed P2 and P3 must be set to zero Device Temp Coeff The device temperature coefficients are polynomial coefficients to linearize the temperature measurement device The default coefficients are for a Platinum 100 RTD Caution Do not alter these coefficients unless you have a different temperature device and consult with VEGA For adjustments to the temperature input with a Platinum 100 RTD use the Temperature Probe Offset that follows The default values for the Platinum 100 RTD are Coeff Temperature Units C Coeff Temperature Units F Do Do 243 50029 Do 135 2779 D D 0 01909 D 0 010606 D D2 7 9066 x10 D 4 3892x10 For a linear temperature device the coefficient D2 Coeff2 must be set to zero Do is the offset term and D is the linear term See Working with a Linear Temperature Device on page 111 Offset The temperature probe offset term can add to the temperature sensor reading to get the correct temperature To determine if you need to adjust the Temperature Probe Offset check the process chain menu see page 52 for process chain information The process chain lists the process temperature If the temperature is not correct adjust the Temperature Coefficient Offset value to get the correct reading Process Temp The process temperature is the temperature of the process material Analog in Cal The Analog in Cal featu
18. Process chain The process chain is a description of the transmitter software s calculation of a density measurement from a radiation reading In the Process chain screen a user can view intermediate values of the calculation to verify proper functionality of the software Press the hot spot key gt gt gt on the communicator to display the Primary channel screen Primary channel The display values for the Primary channel screen are Temp Displays the internal probe s measurement of the sensor temperature Sensor cnts Displays the sensor counts that are true counts output from the sensor before application of the following e Temperature compensation e Standardize e Sensor uniformity gains TC counts Displays temperature compensated counts that are sensor counts with application of temperature compensation Raw counts Displays raw counts that are temperature compensated counts with application of uniformity gain Adj counts DSGH Technical Reference Manual 52 Advanced Functions Displays adjusted or sum counts that are raw counts plus auxiliary raw counts In most applications this does not use auxiliary input so sum counts are equal to raw counts SD counts Displays source decay counts that are sum counts with application of source decay gain Stdz counts Displays standardize counts that are source decay counts with application of standardization gain cnt range Displays compensated measureme
19. Technical Reference Manual 136 Special Units Indication If you know the percent solid indication of the gauge and want to determine the effective density it calculates with the following equation that is the effective density solution to the above equation Der 100 Pspe Cspo 100 solid Pspa solid Cspa The DSGH calculates the percent solution with the following equation Der Cspa 100 Pspa C spa i The percent solution solved for effective density is solution Asolutionx Pspa Cspg Deti 100 tCspa Initial settings and calibration requirements To use the DSGH as a percent solid or percent solution indicator it must have specific settings in the Initial setup screens and proper calibration Refer to these sections of this manual for more details Table 31 Initial settings and calibration percent solid or solution Setting Manual heading Page Set units as solid or solution Units 82 Set process span Min density Max density with the appropriate Span settings process span 88 values in solids or solution units Calibrate on low density with only carrier liquid for slurry or Set low density 45 solid liquid solutions or on only one solution for liquid liquid solutions Calibrate on slurry at high end of range to be measured or final Set high density 46 product solution at high end of range to be measured Set current loop span 4 mA density 20 mA density with the Span settings current loop 88
20. To set up temperature compensation with a linear device 112 To set mass flow 116 To calibrate the analog input circuit board 120 Changing the Responder unit function 128 To connect directly to a Responder 130 To set up the GEN2000 RS 485 local network 131 To collect linearizer table data 144 Calculating the linearizer 144 DSGH Technical Reference Manual Preface Explanation of symbols Table 2 lists the symbols that the manual and instrument use Table 2 Explanation of symbols Radiation notice In the manual information concerning radioactive materials or radiation safety information is found in the accompanying text Caution In the manual warnings concerning potential damage to the equipment or bodily harm are found in the accompanying text AC current or voltage On the instrument a terminal to which or from which an alternating sine wave current or voltage may be applied or supplied DC current or voltage On the instrument a terminal to which or from which a direct current voltage may be applied or supplied Potentially hazardous voltages On the instrument a terminal on which potentially hazardous voltage exists DSGH Technical Reference Manual 11 Preface Your comments VEGA values your opinion Please fill out this page so that we can continually improve our technical documentation Manual DSGH Detector with GEN2000 Electronics Technical Reference Manual Date Customer Order Number
21. all contained in the same housing Set a gauge to remote if the sensor electronics and processing electronics are in separate housings and the process signal connects to the auxiliary input of the processing electronics Procedure 26 To select the gauge location 1 From the Main menu select Advanced Fxns 2 From the Advanced Fxns menu choose Select gage locati 3 From the Select gage locati menu select either Local or Remote 4 If using a HART hand held communication device press F2 to send 64 DSGH Technical Reference Manual Advanced Functions Notes DSGH Technical Reference Manual 65 Diagnostics and Repair Chapter 5 Diagnostics and Repair Software diagnostics The DSGH system can alert users to potential problems by e Posting messages on the HART screens e Energizing the output relay e Distinctly changing the current loop output Four classes of alarms are available to track the status and history in the Gauge status screens These alarms are e Diagnostic e Analog e Process e X ray Diagnostic alarm Provides information about the DSGH system and alerts the user when periodic procedures are due Analog alarm Sets the current loop mA output to either 2mA or 22mA when the detector outputs zero counts Process alarm Allows the relay output to trip when the process value is either above high limit or below low limit a setpoint X ray alarm Distinctly changes the current loop mA output in respons
22. beam through the process pipe or vessel Shields the radiation elsewhere The model chosen for each particular system depends on the source capsule inside and the radiation specification requirements A shutter on the source holder either completely shields the radiation Source off or allows it to pass through the process source on Shutter On Off Source tag Figure 3 Typical source holder DSGH detector assembly 20 Mounts opposite the source holder Inside the housing is a scintillation material The scintillation material produces light in proportion to the intensity of its exposure to radiation A photomultiplier tube detects the scintillator s light and converts it into voltage pulses The microprocessor receives these voltage pulses after amplification and conditioning by the photomultiplier tube The microprocessor and associated electronics convert the pulses into a calibratable output Power Supply Board Terminal Block E RS 485 Ground if applicable CPU Board Internal Housing Ground Screw Mounting Bracket F p17 Lam Figure 4 DSGH exploded view DSGH Technical Reference Manual Introduction Principle of operation VEGA s DSGH is a nuclear gauge that receives a narrow beam of radiation through the process material from the source holder The amount of radiation that the detector senses is in proportion to the amount of the materials mass Since the radiation sour
23. determines the shape of the curve between the endpoints Linearization is critical for pipes that are larger than 12 inches As part of the signal processing necessary to produce a linear final output with respect to the change in density of process material the DSGH offers the following choices e Non linear table e Linear table e Equation Note Use the equation linearizer method to perform the one point calibration method For density applications the equation is the default and we recommend it in most circumstances VEGA recommends using the equation linearizer method first If results are not satisfactory contact VEGA Field Service at 513 272 0131 The vast majority of applications do not require any method other than equation Refer to Appendix IV of this manual for further explanation of the different methods Equation The linearizer equation calculates a density reading for a given count reading at the detector To make the correct calculation it relies on the following information e Vessel s inner diameter system parameter see page 91 e Span settings parameter see page 88 e Data used in the calibration e Absorption co efficient Using the equation linearizer also enables a one or two point calibration procedure Table non linear Refer to Appendix IV for more information DSGH Technical Reference Manual 43 Calibration Table linear Refer to Appendix IV for more information Choosing a linearizer
24. gauge accuracy DSGH Technical Reference Manual 45 Calibration Before starting the cal low data collection x Check the parameters as described in the manual section Preparing for Calibration beginning on page 42 Power up gauge one hour before start of calibration Fill vessel or pipe with low process xw Prepare to draw a sample while the gauge is collecting data Setting the cal low density Procedure 4 To set the cal low density 1 From the Main menu select Calibrations Initial cal Two point cal Set Cal low density 2 The prompt Set process to desired value Take data displays Select Yes to enable the data collection to take place The on screen counter displays the time left If necessary press F3 to discontinue data collection 3 After data collection the screen prompts you to input the actual value e Actual value is the value in engineering units from the lab e Atthis step you can skip to the Cal high density procedure to perform the data collect for the high density sample Then come back to step 6 to enter the actual values e Take the sample drawn during the data collect to the lab to determine the actual density 4 At the prompt Input Actual Value enter the actual density from the lab in engineering units 5 If using a hand held communicator press F2 to send the calibration setting to the DSGH Step 2 Set high density Setting the high density for calibration requ
25. in the On or Open position to create the required radiation field Extreme build up on walls or other material shielding the detector from the radiation field Damage or disconnection of electrical connections from the sensor assembly to the CPU board Process alarm The process alarm alerts users when the process value density is above a setpoint high limit or below a setpoint low limit Enter the choice of low or high limit and the setpoint in the Initial setup screens See Appendix l Initial Factory Setup for details The process alarm works only with the output relay No HART messages gauge status diagnostics or history information saves for the process alarms The DSGH acknowledges or resets the process alarm when the process value returns back to the setpoint value Depending on your usage of the process alarm relay you may want to install a process alarm override switch to manually turn off an annunciator when the DSGH relay energizes X ray alarm The x ray alarm compensates for false indicated process values that occur when the gauge detects external radiographic sources For example vessel weld inspections often use portable radiographic x ray sources X rays that the gauge detects cause a false low reading and adversely affect any control based on the gauge output The x ray alarm can perform the following actions e Alter the current loop output to indicate the alarm condition e Trip the output r
26. is toggled on Toggle individual alarm conditions On or Off in the Diagnostic alarm screens from the Initial setup Alarms Mode configuration menus When a HART device initially connects to the DSGH any conditions in alarm display on the screen 68 DSGH Technical Reference Manual Diagnostic check on Gauge status screen RAM status Sensor EEPROM status Real time clock test Sensor temp probe test Standardize due Source wipe due CPU EEPROM status Alarm type 1 Alarm type 2 Shutter check due New hardware found Sensor status Process out of range Sensor voltage status DSGH Technical Reference Manual Diagnostics and Repair Summary of diagnostic alarm conditions Table 7 Summary table of diagnostic alarm conditions Normal Error conditions Pass Fail Pass Fail Pass Fail Pass Fail No Yes No Yes Pass Fail Not used Not used No Yes No Yes Pass Fail No Yes Pass Fail HART message RAM corrupt Sensor EEPROM corrupt Real time clock fail Sensor temp probe fail Standardize due Source wipe due CPU EEPROM corrupt Shutter check due New hardware found Sensor fail Process out of measurement range Sensor high voltage fail Alarm acknowledgment Recommended action RAM memory corruption has occurred and resolved internally Repeated triggering of this alarm indicates a possible hardware problem consult V
27. o ooo de SAmpersopen i O 11 and 12 0 100 mA 9 and 10 11 and 12 11 and 12 0 10V 13 and 14 11 and 12 0 25V 15 and 16 11 and 12 114 DSGH Technical Reference Manual Special Applications 3 E E 2 v v 3 z E 3 E se 5 a z S a E v 2 Kag a v 62 E U 28 co og Us v 5 8 a o iv 2 3 R 3 5 amp c S y ie o w 5 45 IL wn l Ze 35 53 gk 23 s 3 interface Figure 31 Mass flow input interfaces with the circuit board If you notice errors in the measurement that relates to the input you may need to calibrate the analog input board See Calibrating the Analog Input on page 120 DSGH Technical Reference Manual 115 Special Applications Algorithm for mass flow The mass flow algorithm allows the final indication of the DSGH to be a mass time indication instead of a density indication Calculation of the mass flow is from the weight per volume w v that the DSGH density gauge measures and the volume per unit time v t of the process flowing through the pipe that the flow meter measures Mass flow w v v t Refer to Procedure 55 to set up mass flow Setting up mass flow Note Before setting up mass flow set up the gauge for the density or percent solids measurement first Be sure to enter the correct process span If using percent solids enter the correct product and carrier densities
28. process standardization 48 Automatic standardization reminder 48 Choosing a standardization method 49 Performing a standardization 51 CHAPTER 4 ADVANCED FUNCTIONS 52 Process chain 52 Primary channel 52 Process variables 55 Auxiliary channel 56 Min Max history 56 DSGH Technical Reference Manual Preface Preface Temp min max 56 Sensor min max 56 Aux in min max 56 Last reset 56 New hardware or EEPROM corrupt 57 Test modes 58 Milliamp output test mode 59 Sensor test mode 59 Auxiliary input test mode 60 Relay test mode 61 Temperature test mode 61 Other advanced functions 62 Checking the sensor voltage poll address equipment version serial numbers and temperature coefficients 62 Sensor voltage 62 Poll address 62 Firmware version 62 Hardware version 62 CPU serial number 63 Sensor serial number 63 View temperature coefficients 63 Select gauge location 64 CHAPTER 5 DIAGNOSTICS AND REPAIR 66 Software diagnostics 66 Diagnostic alarm 66 Analog alarm 66 Process alarm 66 X ray alarm 66 Gauge status 67 Diagnostic alarms and HART messages 67 Analog alarm 70 Process alarm 70 X ray alarm 70 History information 71 Hardware diagnostics 72 Test points 74 Jumpers 74 LED indicators 75 Troubleshooting 77 Maintenance and repair 77 Periodic maintenance schedule 77 Source wipe and shutter check recording 77 Spare parts 78 Field repair procedures 78 Replacing the CPU or power supply board 79 Requesting fie
29. table to enter any linearizer Note VEGA recommends using the equation method first In most applications it gives the best results If for some reason the calibration is not satisfactory you can try the linearizer table Two linearizer tables are available Non linear table Linear table Non linear table The non linear table is more accurate than the linear table This is because the non linear table takes into account the inherent non linearity of a nuclear transmission measurement The non linear table can use data from the following e Actual process samples e Linearizer data from an earlier model VEGA density gauge Table linear This option enables you to use a linear straight line set of data for a linearizer look up table You do not need to collect linearizer table data points This is because the straight line linearizer calculates from the high and low density calibration points DSGH Technical Reference Manual 142 Using a Linearizer Table Calibration using a non linear table linearizer The following flow chart outlines the non linear table linearizer calibration procedure Note You must use the two point calibration when using a linearizer table Change linearizer to non linear table in Calibrations Linearizer screen Is linearizer set to non linear table Is process span set correctly Change measurement span in Initial setup screens Perform Set Low Density and Set High Den
30. the current loop 41 Procedure 2 Choosing a linearizer method 44 Procedure 3 Performing a data collect 45 Procedure 4 To perform a one point calibration Error Bookmark not defined Procedure 5 To set the cal low density 46 Procedure 6 To set the cal high density 47 Procedure 7 To calculate the calibration 47 Procedure 8 Standardization on water 49 Procedure 9 Standardization on process 50 Procedure 10 Procedure 11 Procedure 12 Procedure 13 Procedure 14 Procedure 15 Procedure 16 Procedure 17 Procedure 18 Procedure 19 Procedure 20 Procedure 21 Procedure 22 Procedure 23 Procedure 24 Procedure 25 Procedure 26 Procedure 27 Procedure 28 Procedure 29 Procedure 30 Procedure 31 Procedure 32 Procedure 33 Procedure 34 Procedure 35 Procedure 36 DSGH Technical Reference Manual To standardize on absorber plates 50 To perform a standardization 51 Resetting the minimum and maximum history 57 New Hardware Found message with new CPU board 57 Repairing corrupted EEPROM 58 To start the mA output test mode 59 To exit the mA output test mode 59 To start the Sensor test mode 60 To exit the Sensor test mode 60 To start the Auxiliary test mode 60 To exit the Auxiliary test mode 61 To start the Relay test mode 61 To exit the Relay test mode 61 To start the Temperature test mode 61 To exit the Temperature test mode 62 To check the equipment version and serial numbers 63 To select
31. the due date Press F4 to exit Spare parts Contact VEGA Field Service at 1 513 272 0131 for parts service and repairs Outside the U S contact your local VEGA representative for parts service and repairs Field repair procedures Very few parts are field repairable but you can replace entire assemblies or boards The following parts are replaceable CPU circuit board Power supply circuit board Use great care to prevent damage to the electrical components of the gauge VEGA recommends appropriate electrostatic discharge procedures 78 DSGH Technical Reference Manual Diagnostics and Repair Replacing the CPU or power supply board You may have to replace a circuit board if there is damage to one of its components Before replacing a circuit board check the troubleshooting flowcharts or call VEGA Field Service to be sure a replacement is necessary The sensor EEPROM contains a backup of the CPU board EEPROM After physically replacing the CPU board you must perform a memory backup to update the CPU board EEPROM with the information in the sensor board EEPROM Perform the memory back up in the New hardware screen from the Advanced Fxns menu 10 11 12 13 14 Replace the CPU board Procedure 30 To replace the CPU or power supply board Turn off power to the gauge Remove the housing cover Remove the plastic electronics cover Remove the terminal wiring connector Remove the three 3 screws holding
32. tref t Where d corrected density reading dm measured density reading Po offset term 0 P process temperature coefficient tref temperature that the density readings is adjusted to t measured process temperature Determining process coefficient P4 P4 d dy tL ty Where d density at low temperature dy density at high temperature tt low process temperature ty high process temperature DSGH Technical Reference Manual 107 Special Applications Initial settings and calibration requirements To use the DSGH with temperature compensation it must have specific settings in the Initial setup screens 108 Setting up temperature compensation Procedure 53 Setting up temperature compensation From the Main menu select Initial setup From the Initial setup menu select Auxiliary input From the Auxiliary input menu select Compensation The Compensation screen displays the current type of auxiliary input From the Compensation menu select Type From the Type menu select Temperature and press F4 to enter You return to the Compensation menu From the Compensation menu select Temp From the Temp screen adjust the settings as required See the Temperature Compensation Parameters section for a description of the parameters If using a hand held HART communicator press F2 to send the settings to the transmitter DSGH Technical Reference Manual Special Applications Temperature compensation par
33. 17 To exit the Sensor test mode 1 From the Advanced Fxns menu select Test mode Sensor test mode Exit test mode 2 At the prompt select Yes to exit the test mode Auxiliary input test mode The auxiliary input test mode simulates the auxiliary input frequency at a user defined number of counts The effect of auxiliary input counts depends on the auxiliary input mode Examples are e Temperature probe e Flow meter e Second transmitter While in auxiliary input test mode after you enter the desired number of counts it can be useful to look at the Process chain screen to view the variables affected by the auxiliary input counts value To view the Process chain screen back out of the test mode screens using the LEFT ARROW The transmitter continues to operate in auxiliary input test mode until it times out after one hour or until you choose Exit auxiliary input test mode Start auxiliary input test mode Procedure 18 To start the Auxiliary test mode 1 From the Main menu select Advanced Fxns Test mode Aux Inp test mode Aux Inp test mode 60 DSGH Technical Reference Manual Advanced Functions At the prompt select Yes to adjust counts Input the Aux counts that you want to force At the prompt select Yes to start test mode and send new data ON Re The transmitter continues functioning in auxiliary test mode until it times out after one hour or until you choose Exit Aux test mode Exit auxiliary input test mode Proced
34. 2 to enter actual values See the Cal Low Density procedure 4 Take the sample drawn during the data collect to the lab to determine the actual density 5 The prompt Input Actual Value displays Enter the actual density from the lab in engineering units 6 If using a hand held communicator press F2 to send the calibration setting to the DSGH Step 3 Calculate calibration The DSGH can make the calibration calculation after collection of the high and low density calibration data Note If you choose to use the non linear table linearizer and collect data on process for a linearizer you must perform those steps first See the sections Collecting Linearizer Table Look Up Data and Calculating a Linearizer Curve in Appendix IV Procedure 6 To calculate the calibration DSGH Technical Reference Manual 47 Calibration From the Main menu select Calibrations Initial cal Two point cal Cal result The screens display the results of the cal low and cal high sensor counts and values Review the values You can manually edit the counts and collect actual or new data can by repeating the Set low and Set high procedures or press F4 to continue The prompt Proceed with Calibration Calculation displays Select Yes to proceed with the calculation Press F2 to save When is a new calibration necessary Under most circumstances you do not need to repeat the calibration procedure The system requires onl
35. 24 DSGH Technical Reference Manual Special Applications Note If it does not connect click Disconnect click Exit and entirely close Ohmview 2000 Wait for 30 seconds and open the program again using the Launcher program Select another port After selecting the proper port with the HART modem the program remembers the last port used and selects it again Main Screen 5 x Select the Connected to Tag Number proper Address Port 1 4 Eg RS 485 y Port Selection Main Screen Exit Figure 36 Ohmview 2000 RS 485 main screen Current errors Tag number of or alarms the Master Main Screen ag Number ADD 15 Address 15 RS 485 Master f Port Selection 1 x Responder Gauge Data Master jumper setting Responder Function Master should not have a jumper Comm Stats Master Configuration Exit Figure 37 RS 485 Master Main menu screen The Main menu for the master contains the following selections e Connect or Disconnect Click to connect or disconnect from the gauge DSGH Technical Reference Manual 125 Special Applications e Responder Gauge Data see page 126 e Responder Function see page 127 e Comm Stats see page 128 e Master Configuration see page 129 e Exit Click to exit program Responder Gauge Data This screen displays the units and the counts for each Responder gauge as selected If a unit does not display a count
36. 4 20 mA to the process value set the span of the current loop output in the loop span screen from the Initial setup Process parameters Spans Current loop span menu See the Appendix l Initial Factory Setup section for details Note The current loop and process spans are independent and set separately The current loop span sets the density indications for the 4 mA and the 20 mA outputs The process span sets the endpoints of the calibration curve The current loop span and process span are set in the Initial setup screen from the Main menu Use the View settings function from the Initial setup menu to quickly check the span settings A direct measurement of the current is preferable Take this measurement by hooking the meter up in series with the instrument and the DCS However if you know the resistance of the DCS use a voltage measurement to calculate the current DCS DCS ieee fy Current meter Volt meter Ce ee ie DOO0oO0000o00000 Detector housing Terminal block Detector housing Terminal block pins 13 amp 14 pins 13 amp 14 Figure 15 Measuring the current loop output DSGH Technical Reference Manual 39 Calibration COUNTS Figure 16 H1 and H2 test points Before a current loop calibration Connect an ammeter or the DCS to terminal connections 13 mA and 14 mA or the test points H1 and H2 on the power supply board or anywhere along the current loop Make sure ther
37. 5 Radiation detector s level with HART protocol output using RS 485 Side view Top view DSGH Technical Reference Manual Special Applications Detector wiring Q 3 A 4 FA 4 ZZZ Figure 34 Interconnect GEN2000 RS 485 multiple detectors transmitters DSGH Technical Reference Manual 123 Special Applications Figure notes 1 Sensor location 9 4 20 mA output 17 Control room 2 High level alarm vapor density 10 Middle level 18 4 20 mA output signal 3 Relay 11 CENELEC ground 19 Modem 4 DSGH detector 12 Housing ground 20 PC 5 Power Earth ground 13 RS 485 connection enlarged 21 Handheld terminal option 6 Top level 14 Bottom level 22 mA input DCS T LFXG H or LSGH 15 Low level alarm auto zero 8 RS 485 signal cable 16 Additional detectors option Software To setup the RS 485 network you must have firmware version 2000 30 or 2000 30C or higher Ohmview 2000 version 2 0 0 or higher and a HART modem with a connection to a communication port The Ohmview 2000 Launcher program has the RS 485 feature Select this feature to setup the RS 485 network choose compensation types and view information about the gauges Ohmview 2000 Launcher ersion 1 0 1 0 O x Exit Language About OHMART Model DSGH DSTH Click RS 485 Network to start the configuration program Ohmyiew 2000 Data Logger Config File Convert Figure 35 Ohmview 2000 Launcher program 1
38. A current lov output 10s before 4 X ayy Dither level 1 lt gt r 1 1 ti Dither miele time i i Cycle period l Figure 19 X ray interference alarm output History information Information about critical events stores in the Diagnostic history screens from the Gauge status View history menus You can view the newest and oldest trigger records of the following events e RAM corrupt e Sensor EEPROM corrupt e FLASH corrupt e Realtime clock fail e Sensor temperature fail e Standardize due e Source wipe due e New hardware found e CPU EEPROM e Alarm type 1 e Alarm type 2 e Shutter check due e Sensor fail DSGH Technical Reference Manual 71 Diagnostics and Repair e Process out of range e Sensor voltage out of spec Use this information to determine if a problem has recently occurred and was repaired internally An example of this is an EEPROM corruption Hardware diagnostics There are two circuit boards in the DSGH that are field replaceable Figure 20 identifies these two circuit boards Power Supply Board Terminal Block SS a RS 485 Ground if applicable CPU Board nternal Housing Ground Screw S a pe Ns Mounting Bracket Fa 4 n e w PROS ri Figure 20 Circuit board identifications 72 DSGH Technical Reference Manual Diagnostics and Repair Refer to Figure 21 for help in finding test points fuses jumpers and connectors on the CPU circuit board
39. Corruption HART CPU Active Auxiliary High Voltage Relay amp Field Strength Power specifications change if an internal heater kit is used See page 102 DSGH Technical Reference Manual 17 Introduction Typical applications Density The DSGH can measure the density mass per volume of liquids and slurries through a pipe or vessel wall without contact to the material Percent solids The DSGH can measure the percent of solids in a carrier when you enter the known density value of both the carrier and the solids into the software Cut detection or interface detection The DSGH can detect the interface between liquids flowing in a pipe when the liquids differ in density System overview The DSGH detector uses VEGA s GEN2000 electronics The GEN2000 is VEGA s newest compact electronics that support 4 20 mA HART protocol frequency or field bus output The DSGH system consists of three main components 1 Source holder 2 DSGH detector assembly 3 Communication device HART modem with PC or HART Communicator Model 275 18 DSGH Technical Reference Manual Introduction Source holder z Hand held terminal Control system 6A relay alarm 4 to 20mA current loop Computer Figure 2 System overview DSGH Technical Reference Manual 19 Introduction Source holder A cast or welded steel device that houses a radiation emitting source capsule Directs the radiation in a narrow collimated
40. Displays the current value of the standardize gain that adjusts with each standardize procedure HV setting DSGH Technical Reference Manual 55 Advanced Functions Displays the HV setting feature that is the set point for sensor high voltage Auxiliary channel The display values for the Aux channel chain screen are Aux raw counts Displays the frequency input counts from optional auxiliary input Filt counts Displays the filtered auxiliary counts The filter dampening value is the number to enter for the auxiliary input filter time constant Min Max history The min max history displays the minimum and maximum value for parameters since the last min max reset The values displayed are Temp min max Displays the internal temperature of the scintillator sensor This does not apply to ion chamber detectors Sensor min max Displays raw uncompensated counts from the detector Aux in min max Displays auxiliary input if used counts Last reset Displays the date of the last min max reset Resetting the minimum and maximum history You can reset the minimum and maximum history values so that they record from the time of the reset 56 DSGH Technical Reference Manual Advanced Functions To reset the minimum and maximum history Procedure 11 Resetting the minimum and maximum history 1 From the Main menu select Advanced Fxns Min max history 2 From the Min max history screen select Reset min max 3 When
41. EGA Field Service Memory corruption has occurred on the sensor pre amp board EEPROM and may not have been resolved internally To check if the problem is recurring after acknowledging the alarm cycle power to the unit If alarm occurs again it indicates a hardware problem Perform the procedure Repairing corrupted EEPROM on page 58 The clock has failed which may result in miscalculation of timed events If there has not been any power to the DSGH for more than 28 days reset the time and date To resolve try to reset the time and date If the time and date do not reset call VEGA Field Service The sensor temperature probe may not be functioning which results in erroneous measurements Verify by checking the sensor temperature in the Primary channel screen from the Advanced Fxns Process chain menus If the temperature reads 0 5 C constantly the probe is broken and you may need to replace the sensor assembly Call VEGA Field Service A standardize procedure is due Alarm is acknowledged automatically by the system when a process standardize procedure is completed in the Process Stdz screen from the Calibrations menu A source wipe is due Alarm acknowledges by logging a shutter check in the Source function screen from the Initial setup System parameters menus See page 77 for details Memory corruption has occurred on the CPU board EEPROM and may not have been resolved internally To check if the problem is recurri
42. Shipping address Billing address Date needed Method of shipment ST HkERAKRAARA A Tax information 80 DSGH Technical Reference Manual Diagnostics and Repair Returning equipment for repair Procedure 31 Returning equipment for repair 1 Call VEGA Nuclear Products Repair at 513 272 0131 between Monday and Friday 8 00 A M to 5 00 P M United States Eastern Standard Time 2 VEGA assigns the job a material return authorization MRA number Please note VEGA reserves the right to refuse any shipment that does not have a MRA number assignment 3 Indicate the MRA on the repair service purchase order 4 Clearly mark the shipping package with the MRA number 5 Send the confirming purchase order and the equipment to VEGA Americas Inc Attention Repair Department 4170 Rosslyn Drive Cincinnati OH 45209 1599 USA Note You must first contact VEGA and receive a material return authorization number MRA before returning any equipment to VEGA VEGA reserves the right to refuse any shipment not marked with the MRA number DSGH Technical Reference Manual 81 Initial Factory Setup Appendix I Initial Factory Setup Perform all setup functions from the Initial setup menu These functions include the following e Process parameters e System parameters e Alarms e Auxiliary inputs e Spans setup Perform Setup before the initial calibration since some parameters are necessary for calib
43. Technical Reference Manual DSGH Radiation Based Detector with GEN2000 Electronics for Density Measurement il Document ID 31399 Nuclear Revision history Table 1 Revision History Version Description Date 1 0 Initial release Formerly 241528 051201 1 1 Corrected website address for VEGA 061211 Corrected copyright and registered marks 1 2 Electronics revision 090306 1 3 Added certification information and IECex lable 090814 1 4 Changed company name logo and website 110301 1 5 Removed one point calibration 111121 1 6 Updated certification information 140516 Copyright 2014 VEGA Americas Inc Cincinnati Ohio All rights reserved This document contains proprietary information of VEGA Americas Inc It shall not be reproduced in whole or in part in any form without the expressed written permission of VEGA Americas Inc The material in this document is provided for informational purposes and is subject to change without notice HART is a registered trademark of The HART Communication Foundation ISO 9001 approval by Lloyd s Register Quality Assurance Limited to the following Quality Management System Standards ISO 9001 2008 ANSI ASQC Q9001 2008 Approval Certificate No 107563 GEN2000 electronics is a registered trademark of the VEGA Americas Inc VEGA Americas Inc 4170 Rosslyn Drive Cincinnati Ohio 45209 1599 USA Voice 513 272 0131
44. a linear table linearizer flow chart DSGH Technical Reference Manual 145 Using a Linearizer Table Notes 146 DSGH Technical Reference Manual Index Using a Linearizer Table count range 57 process span 57 2 20mA Density 95 4 4 mA Density 95 A absorber plates 53 Adj counts 56 Advanced Functions 55 Advanced Fxns 55 alarm analog alarm 103 setup 101 Alarm out 2 mA alarm setup 103 Alarm out 22 mA alarm setup 103 analog alarm acknowledging 74 selecting 2mA or 22mA 103 Analog alarm 69 analog input circuit board 111 analog output See current loop output API See degrees API applications 18 Auto Zero feature 140 Aux channel chain 59 Aux raw counts 59 auxiliary input 107 input parameters 107 Auxiliary input test mode 63 Baume See degrees Baume C calibration current loop analog output 40 preparation for 43 process 43 Calibration new required 51 Counts high 58 Counts low 58 CPU board DSGH Technical Reference Manual jumpers 78 LED indicators 79 replacing 83 CPU EEPROM corrupt 60 61 alarm acknowledge 73 alarm setup 101 in diagnostic history 75 CPU EEPROM status diagnostics check 73 CPU serial number 65 current loop calibrating on the bench 27 calibration 40 output fixed at 2mA or 22mA 74 power source or sink mode 78 PV unit 96 span 95 current loop output test mode 61 custom units 89 Customer Order C O Number required
45. ach gauge using Ohmview 2000 and setup each gauge for the particular application Access the Ohmview 2000 electronic manual under Help for further information on setting up the gauge DSGH Technical Reference Manual 133 Special Applications Auto Zero feature Use this feature with the RS 485 network to provide data to the primary level gauge The counts feed into the level gauge from the low point indicator on the vessel When the level gauge senses a preset threshold value it implements the Auto Zero feature This feature resets the zero point Setting up the Auto Zero feature To enable this feature using Ohmview 2000 s RS 485 Network program you must have firmware 2000 30 or 30C or higher for GEN2000 instruments 134 DSGH Technical Reference Manual Special Applications Notes DSGH Technical Reference Manual 135 Special Units Indication Appendix Ill Special Units Indication Percent solid or percent solution indication The DSGH can be set up to indicate percent solid or percent solution The setup requires the choice of units solid or solution in the Process units screen from the Initial setup Process parameters menus for this feature View the following two definitions to see which one applies to your process e Slurries in which the solid product does not dissolve in the carrier liquid generally use percent solid e Solutions in which the solid product dissolves in the carrier liquid or when two solut
46. al Reference Manual Initial Factory Setup Notes DSGH Technical Reference Manual 101 Special Applications Appendix Il Special Applications This chapter provides application specific information for special installations If your application is not in this section you may have application specific information on the certified drawings If you have other application questions contact VEGA Field Service in the U S or Canada at 513 272 0131 Clients outside of the U S and Canada should contact their local representative Internal heater kit for applications rated to 50 C A heater kit option is available for the DSGH for applications that require a 50 C 58 F temperature rating With the heater option the internal temperature of the unit rises approximately 30 C 54 F degrees The features of the heater are as follows e The heater kit does not affect the functionality of the DSGH in any way There is no requirement for special firmware e The factory installs the internal heater kit if you order it with the DSGH e Three different kits are available one for 115VAC one for 220VAC and one for 24VDC The part numbers are shown below Table 19 Heater kit part numbers Heater kit power VEGA Part Number 115 VAC 240723 220 VAC 240724 24 VDC 241912 Changes to specifications The power rating changes from the specifications on page 17 of this manual when you install the heater kit on the DSGH With
47. al known lab value of process Accept or reject the results when they display Repeat procedure for all available samples Press F2 to send Calculating the linearizer curve Calculate the linearizer after you perform the following steps e Select non linear table for the linearizer curve e Collect linearizer data OP OT Oe IN 144 Procedure 61 Calculating the linearizer From the Main menu select Calibrations From the Calibrations menu select Linearizer From the Linearizer menu select Linearizer data From the Linearizer data menu select Linear data coll From the Linear data coll menu select Calc linearity At the prompt select Yes to proceed with the linearity calculation The linearizer table calculates based on the samples you collect Press F2 to save DSGH Technical Reference Manual Using a Linearizer Table Calibration using a linear table linearizer The following flow chart outlines the calibration procedure for using a linear table linearizer Note You must use the two point calibration when using a linearizer table Is linearizer set to Change linearizer to linear table linear table in Calibrations Linearizer screen Is process span set Change measurement span in correctly Initial setup screens Perform Set Low Density and Set High Density procedures in any sequence in Initial cal screens Perform Calculate Result procedure in Initial cal screens Figure 45 Calibration with
48. ameters See the previous section Algorithm for Temperature Compensation to see how to use these parameters Note When using Ohmview 2000 to set up your temperature compensation verify that you have selected the correct temperature unit Jox File Communication Utilities Monitor Help Tag DEMO Type Temp Comp Density Communication Statistics 100 Select Tabs Gauge Setup Cal Parameters PY Units Spans Filtering Source Functions SystemInfo AuxInput Temperature Comp Process Info Temperature Units Setup Reference Temp 0 00 Calibration Temperature Offset 0 00 Cettia Process Temperature 25 00 Diagnostics Alarms Device Temp Coeffs Process Temp Coeffs fto 9 000000 coeff fo o00000 i Linearizer Type 0 000000E 0 coeff 0 000000E 0 GEN Table Non linear 0 000000E 0 coeff2 fp 000000E 0 meng Ee coef 9 000000E 0 Disconnect OHMART Figure 29 Ohmview 2000 Temperature Compensation tab Temp Units Choose the units for the temperature C or F Ref Temp The reference temperature is the temperature to which the density reading adjusts Process Temp Coeff The process temperature coefficients are polynomial coefficients to linearize the process They are dependent on the process material and how it changes with temperature Your process testing lab should determine these coefficients DSGH Technical Reference Manual 109 Special Applications Po Coeff0 is the offset term and
49. appropriate values in solid or solution units span DSGH Technical Reference Manual 137 Special Units Indication Degrees API indication The DSGH can be set up to indicate degrees API by choosing degAPI in the Process units screen from the Initial setup Process parameters menus Petroleum industries use the unit degrees API The DSGH directly measures only the total mass in the volume between the detector and source holder This is equivalent to a direct measurement of density mass volume since the volume remains constant When the DSGH indicates degrees API it is indicating a derived quantity The DSGH calculates degrees API with the following equation 141 5 API Spe 131 5 When the DSGH is indicating API the following equation calculates the specific gravity 141 5 SpG 131 5 API Initial settings and calibration requirements To use the DSGH as a degrees API indicator it must have specific settings in the Initial setup screens and proper calibration Refer to these sections of this manual for more details Table 32 Reference table for Initial Setup and calibration degrees API Setting Manual heading Set units as degrees API Units Set process span Min density Max density with the appropriate Span settings process span values in degrees API units Calibrate on low density Set low density Calibrate on high density Set high density Set current loop span 4 mA density 20 mA density wi
50. ardize due CPU EEPROM corrupt Sensor EEPROM corrupt Source wipe due Alarm Type 1 Flash corrupt New hardware found Alarm Type 2 Real time clock Shutter check due Sensor temp Process out of measurement range 94 DSGH Technical Reference Manual Initial Factory Setup Setting the diagnostic alarm conditions Procedure 46 Setting the relay as a diagnostic alarm 1 From the Main menu select Initial setup 2 From the Initial setup menu select Alarms 3 From the Alarms menu select Mode configuration 4 From the Mode configuration menu select Diagnstic alarm 5 If using a hand held HART Communicator from the Diagnstic alarm menu select Diagnstic Gp1 Diagnostic Group 1 If using VEGA View proceed to the next step 6 From the Diagnstic Gp1 screen scroll through the list of diagnostic conditions that can be used to activate the relay e Toggle the conditions On or Off with the F2 key e Press F4 to enter e Press the LEFT ARROW key to return to the Diagnstic alarm screen 7 If using a hand held HART Communicator from the Diagnstic alarm menu select Diagnstic Gp2 Diagnostic Group 2 8 From the select Diagnstic Gp2 screen scroll through the list of diagnostic conditions and toggle the conditions On or Off 9 If using a hand held HART Communicator press F2 to send the setting to the transmitter Setting the relay as a diagnostic alarm Procedure 47 Setting the diagnostic alarm conditions 1 From the Main menu selec
51. ary input wiring terminals 11 and 12 witha meter for frequency signal Check auxiliary input equipment Call VEGA Field Service A 1mR hr 2 580nC kg hr field is usually required for a measurement Check for closed source shutter buildup amp insulation DSGH Technical Reference Manual Diagnostics and Repair Troubleshooting The following flow charts may be useful to determine the source of a problem They cover these topics e HART communication problems e DSGH transmitter not responding e Measurement not correct Hardware troubleshooting is available at the board not the component level Essentially only the following two hardware components are field replaceable e CPU board e Power supply board Maintenance and repair Periodic maintenance schedule Since the DSGH contains no moving parts it requires very little periodic maintenance We suggest the following schedule to prevent problems and to comply with radiation regulations Table 13 Periodic maintenance schedule Description Frequency Procedure Standardize As required by process conditions usually Calibration chapter at least once a month Source holder Every six months unless otherwise required Radiation safety instructions shipped shutter check by applicable nuclear regulatory agency separately with source holder and following instructions Source wipe Every three years unless otherwise required Radiation safety instructions shipped by applicable
52. calculates degrees Baume with the following equations 140 Be igh spG 30 145 Betneayy 145 Spa When the DSGH is indicating Baume the following equation calculates the specific gravity 140 SpG 1 30 Be tight 14 SpG 2 1450 Be heavy Initial settings and calibration requirements To use the DSGH as a degrees Baume indicator it must have specific settings in the Initial setup screens and have proper calibration Refer to these sections of this manual for more details Table 34 Reference table for Initial Setup and calibration requirements degrees Baume Setting Manual heading Page Set units as degrees Baume light or Baume heavy Units 82 Set process span Min density Max density with the appropriate Span settings process span 88 values in degrees Baume light or Baume heavy units Calibrate on low density Set low density 45 Calibrate on high density Set high density 46 Set current loop span 4 mA density 20 mA density with the Span settings current loop 88 appropriate values in degrees Baume units span 140 DSGH Technical Reference Manual Special Units Indication Notes DSGH Technical Reference Manual 141 Using a Linearizer Table Appendix IV Using a Linearizer Table Most density applications use an equation that calculates internally This calculation linearizes the radiation transmission signal with respect to changing density There is an option in the DSGH that enables the use of a look up
53. ce and detector are always the same distance apart and the volume of process liquid is constant the only possible change in mass is the density of the process The lighter the density of material the more radiation passes through to the detector The heavier the density of material the less radiation passes through to the detector Calibration of the DSGH associates the detector readings known as counts with the density of the material in engineering units The output range of the DSGH is a4 20 mA current loop signal in proportion to the density of the process See Appendix Table 16 for examples of process value settings Communicating with the gauge The VEGA continuous density gauge is a transmitter so it produces the current loop signal directly at the measurement site Use either a HART Communicator or HART modem and VEGA View or Ohmview 2000 software with a PC to enable the following e Initial setup e Calibration e Other communication with the gauge You can make a connection anywhere along the 4 20 mA current loop line After setup and calibration of the density gauge there are no day to day requirements for external electronics Using a universal hand held terminal VEGA s DSGH density gauge is compatible with the Fisher Rosemount HART Communicator The HART Highway Addressable Remote Transducer Communicator uses the Bell 202 Frequency Shift Keying technique to superimpose high frequency digital commun
54. ctions often use portable radiographic sources Detection of x rays by the gauge causes a false low reading and adversely affects any control based on the gauge output The x ray alarm distinctly changes the current loop mA output in response to a marked increase in radiation field It can also trigger the output relay if set up to do so When the gauge detects a radiation field above a set threshold as a percentage of the cal low counts value it sets the current loop output at its value 10 seconds before the detection of the x ray interference It periodically dithers the output about the average cycling until the radiation field is back to the normal level or until a time out period of 60 minutes See the following figure for a diagram of the current loop output in x ray interference mode DSGH Technical Reference Manual 97 Initial Factory Setup output mA current lo output 10s before 4 x ray 4 s Dither level 1 gt i i Dither ee time i Cycle period i Figure 25 X ray interference alarm output Note Only VEGA Field service can adjust the time out period of 60 minutes and the reversion to 10 seconds before the x ray detection In the Initial setup screens you can adjust the parameters shown in the figure The parameters are Threshold Threshold is the percentage beyond the calibration low counts that triggers x ray interference suppression Default value 1 Dither level Dither level is the ma
55. d 1 0SpG Table 14 Example of settings for process values Forward acting proportional Reverse acting inversely proportional 4 mA Density 20 mA Density 4 mA Density 20 mA Density 0 5SpG 1 0SpG 1 0SpG 0 5SpG Procedure 37 Setting the current loop span From the Main menu select Initial setup From the Initial setup menu select Process parameters From the Process parameters menu select Spans From the Spans menu select Current loop span From the Current loop span menu select 4 mA Density In the 4 mA Density screen enter the minimum value for the measurement span From the Current loop span menu select 20 mA Density In the 20 mA Density screen enter the maximum value for the measurement span Press F2 to send the setting to the transmitter View PV unit Field device variable unit Engineering unit to display with the digital value representation minimum span upper range value lower range value lower sensor limit and upper sensor limit Procedure 38 Viewing the PV unit From the Main menu select Initial setup From the Initial setup menu select Process parameters From the Process parameters menu select Spans From the Spans menu select Current loop span From the Current loop span screen select PV Unit Press F4 to exit DSGH Technical Reference Manual 89 Initial Factory Setup System parameters The system parameters define settings for the internal ope
56. e Located on power supply board FCrunning Onmat View Figure 9 Bench test setup Note You may need to reset the time and date if the transmitter has not had power for over 28 days The Real Time Clock Fail message may display It is important to enter the correct time and date because the clock is the basis for source decay calculations Refer to Procedure 39 for instructions on setting the time and date Many users choose to calibrate the current loop output on the bench before mounting the detector on the process Refer to Procedure 1 for complete instructions on calibration of the current loop output DSGH Technical Reference Manual 27 Installation Location considerations When the DSGH was ordered the source was sized for optimal performance Notify VEGA prior to installation of the gauge if the location of the gauge is different from the original order location Proper location of the density gauge can sometimes mean the difference between satisfactory and unsatisfactory operation Note Try to locate the source holder in such a place that process material will not coat it This ensures the continuing proper operation of the source ON OFF mechanism Many regulatory agencies for example the U S NRC require periodic testing of the ON OFF mechanism Refer to the Radiation Safety for U S General and Specific Licensees Canadian and International Users manual and the Radiation Safety Manual Referenc
57. e 1 2 amp 1 3MeV gamma radiation emitter 5 3 year half life 100 230VAC 10 90 250VAC at 50 60 Hz at 15VA maximum power consumption 25VA max with heater CE compliance requires 100 to 230VAC 10 20 60VDC less than 100mV 1 1 000 Hz ripple at 15VA CE compliance requires 24VDC 1 63 0 643mm 14 22AWG 1 000m 3 280ft 1 02 0 643mm 18 22 AWG two conductor shielded 1 02 0 643mm 18 22 AWG four conductor shielded eDesigned to meet National Electric Code U S amp Canada eClass Group A B C amp D Div 1 amp 2 eClass Il Groups E F amp G Div 1 amp 2 EExd IIC T5 pending NEMA 4X IP 66 20 C 60 C 4 F available 140 F option for lower temperatures 0 95 non condensing Tested to IEC 68 2 6 IEC 68 2 27 and IEC 68 2 36 Cast aluminum ASTM A 357 Polyester Powder Coating 5 44kg 12lb 4 20 mA isolated into 250 8000hm Jumper selectable source active or sink passive mode Diagnostic alarm or process high low alarm function 6A at 240VAC or 6A at 24VDC SPDT Form C 1 4 HP at 120VAC BEL202 FSK standard current loop output HART modem and VEGA communications software package HART Communicator Model 275 hand held terminal with VEGA device descriptions loaded Frequency input 0 100 kHz Optional NORM or vapor phase comp multiple gauge linking etc FLASH and two EEPROMs Maintains time date amp source decay compensation Y2K compatible 6V Memory
58. e DSGH alarms to indicate that a standardize procedure is due if the diagnostic alarm Standardize due is toggled on Setting the calibration parameters Procedure 34 Setting the calibration parameters 1 From the Main menu select Initial setup 2 From the Initial setup menu select Process parameters 3 From the Process parameters menu select Cal parameters 4 From the Cal parameters menu select the calibration parameters to view or edit as needed Refer to the help screens F1 or page 84 in this manual for descriptions View or edit the following parameters e Data coll interval e Warn cal span e Process stdz type e Default std e Stdz interval 5 If using a hand held HART Communicator press F2 to send the updated calibration parameters to the transmitter Filtering This feature enables change to the response time of the system by increasing or decreasing the averaging time to filter the noise in the signal An increased time for averaging allows the accumulation of a greater number of readings and therefore produces a greater statistical accuracy However this is at the expense of response time to changes in the process DSGH Technical Reference Manual 85 Initial Factory Setup Type RC exponential or rectangular window The DSGH offers a choice of signal filters RC exponential or rectangular window The DSGH has a sample rate of about 1 sample second but process variables generally change measurably on t
59. e explosion proof housing cap Note Not all connections are required for operation See Table 4 Terminal names and descriptions VEGA provides an internal and external ground screw for connection of the power Earth ground wire After removing the top cover the location of the internal ground screw is at the front of the housing The location of the external ground screw is next to the conduit entry Power Supply Terminal Block cn a ea yo Board RS 485 Ground if applicable CPU Board nternal Housing fN x Ground Screw Pi aa Y a gt gt oo a ENNS e SSN J O el ba A y d y A i j as ee Py Pi Ne Mounting Bracket l A Figure 11 Internal and external ground screw DSGH Technical Reference Manual 31 Installation Customer Earth Ground and Ground to Housin 1 2 3 4 5 6 7 8 mA Input Power cable DCS per local codes Power Earth ground 8 H NH NS HHH SS HH Say HH __S EZAZ D ITT Hand held terminal LLL LL Optional Internal housing ground 5 External housing ground Po ae or eS r Figure 13 Typical interconnect 32 DSGH Technical Reference Manual Installation DSGH 1 O Power in 2 O Power in 310 4O Relay 510 6 O Freq 7 O Freq 8 O 6V 9 O
60. e is a 250Q to 800Q load on the current loop If no load or an insufficient load exists on the loop it may require temporary placement of a resistor across terminals 13 and 14 40 DSGH Technical Reference Manual Calibration Current loop calibration Procedure 1 Calibrating the current loop 1 From Calibrations menu select Current loop cal 2 The Current loop cal screen prompts you to connect the reference meter Press F4 after you connect the ammeter The screen displays Setting Field Device Output To 4 mA The analog output circuit on the transmitter sets the current to approximately 4 mA 3 Read the ammeter and enter the actual milliamp reading Note If using a voltmeter calculate the current value 4 The next screen prompts Field Device Output 4 mA Equal to Reference Meter e Choose Yes if the ammeter reads 4 00 mA e Choose No if the ammeter reads anything but 4 00 mA 6 Repeat until the meter reads 4 00 mA The meter approaches the 4 00 mA successively 7 Repeat procedure for 20 mA setting You can check the current loop output calibration at any time by using the test mode to output a user specified milliamp setting See the section Milliamp Output Test Mode in the manual DSGH Technical Reference Manual 41 Calibration Preparing for calibration Figure 17 illustrates the steps to prepare for and perform the recommended two point calibration Are process units set correctly Change un
61. e to a marked increase in the radiation field This prevents control problems when external radiographic sources are in the area for vessel inspections A summary of the alarm type outputs is in the table below Table 6 Alarm type outputs Option to trigger Display HART Current loop output Gauge status and Alarm type relay message affected gauge history Diagnostic yes optional no Yes Analog no no yes No Process yes no no No X ray yes no yes No DSGH Technical Reference Manual 66 Diagnostics and Repair Gauge status Use the Gauge Status screens under the Main menu to check the present status and historical information Diagnostic alarms and HART messages Diagnostic conditions that are currently in alarm alert the user by three possible means Diagnostics screens in the Gauge Status menu HART messages that appear when a HART device connects if the diagnostic condition is set to On in the Initial setup screens Relay output if it is set as a diagnostic alarm relay and if the diagnostic condition is set to On in the Initial setup screens Note Refer to the table on page 69 for a summary of all of the diagnostic alarm conditions and recommended user actions Gauge status diagnostics screens To check the status of the system you can use the Diagnostics screen from the Gauge Status menu to scroll through a series of checks This screen indicates only the present status View the historical occurrences in the Diagnostic histo
62. echnical Reference Manual 91 Initial Factory Setup 5 Press F4 to save 6 If using a hand held HART communicator press F2 to send the updated parameters to the transmitter Source function Wipe Interval Use the Wipe interval feature to view or enter the interval in days between successive source wipe diagnostic alarms Check with current applicable regulations Record wipe Use the Record wipe feature to record the date and time when you perform a source wipe This resets the diagnostic alarm source wipe due For more information see the Diagnostics and Repair chapter Shut chk Interval Use the Shutter check interval feature to enter the number of days between successive shutter check diagnostic alarms Check with current applicable regulations for recommendations on shutter check intervals Record shut chk Use the Record shutter check feature to record the date and time when you perform a shutter check This resets the diagnostic alarm shutter check due For more information see the Diagnostics and Repair chapter Next wipe Shut due Use the Next wipe and Shutter check due feature to view or enter the due date for the next source wipe and shutter check For more information see the Diagnostics and Repair chapter Tag The tag is a unique eight digit identifier for the instrument The VEGA factory enters this parameter prior to shipment if the information is available at the time of the
63. ect Yes to enable the data collection to take place The on screen counter displays the time left Press F3 if it is necessary to discontinue data collection 3 After data collection the screen displays the number of counts cnts output by the sensor Make note of the counts value 4 Repeat as often as necessary to check repeatability Recommended two point calibration In most installations it is desirable to attain the high and low process conditions for a two point calibration instead of performing a one point calibration The two point calibration method is useful in conjunction with any linearizer method The two point calibration method involves three main steps 1 Setting the low density 2 Setting the high density 3 Calculating the calibration Step 1 Set low density Setting the low density for calibration requires the following e Measurement with the DSGH of the low process sample e Entry of the actual density This sets the low end sometimes referred to as zero of the calibration curve Perform this procedure either before or after setting the high density but only after you correctly enter the process span in the Initial setup screen Note You must perform data collection for the low and high density within ten days of each other for a good calibration The low and high values must be more than 10 of the process span apart for the most accurate calibration Increasing the process span usually increases the
64. elay if the relay is set up to do so The DSGH enters the x ray alarm condition when it detects a radiation field above a set threshold The gauge sets the current loop output at its value 10 seconds before the condition It periodically dithers the output about the average cycling until the radiation field is back to the normal density or until a time out period of 60 minutes The standard x ray alarm only triggers when the counts are greater than the cal low count value These counts are found on the process variable menu If the x ray source is setup so that the counts increase but do not go above the cal low counts the x ray alarm does not trigger and the gauge reads the x ray interference as a true process shift 70 DSGH Technical Reference Manual Diagnostics and Repair VEGA has a system that can detect x rays that are causing process changes This system places a second detector outside of the radiation beam of the primary detector The second detector only monitors x ray interference The second detector has a frequency output that wires to the auxiliary input of the primary detector The primary detector s programming triggers the x ray alarm when the counts of the secondary detector are above a threshold Contact VEGA for more information about the x ray interference detection method Figure 19 illustrates the current loop output You can set the parameters of the output Refer to Appendix I Initial Factory Setup output m
65. ency signal With special software the frequency signal incorporates into the final output The software provides special settings for three typical uses of a frequency input e Temp compensation e NORM compensation e Summation mode e Mass flow compensation DSGH Technical Reference Manual 99 Initial Factory Setup Input parameters Input filter Input filter is the auxiliary input signal with application of the time constant Setting the input filter Procedure 52 Setting the input filter 1 From the Main menu select Auxiliary input 2 From the Auxiliary input menu select Filter TC 3 In the Filter TC screen input the value for the filter time constant 4 Press F4 to enter 5 If using a hand held HART Communicator press F2 to send the setting to the transmitter Multiple DSGH gauge input The DSGH can receive raw sensor output from another slave DSGH that the HART current loop cannot use The master DSGH receives the input and uses the incoming signal to modify its output For example you may use this feature to make the master DSGH read the difference or sum of two density gauges This feature is available after you choose the Summation feature from the Compensation menu If you choose to use this feature first contact VEGA Field Service at 513 272 0131 for advice Custom Custom auxiliary input settings are possible with custom software Contact VEGA for information on custom orders 100 DSGH Technic
66. erence Manual Installation 37 Calibration Chapter 3 Calibration Before using the DSGH to make measurements you must perform the following e Calibrate it to relate the detection of radiation from the source to the density of the process material e Calibrate the current loop to a reference ammeter or the distributed control system DCS e Periodically you must standardize the system on process to adjust for changes over time Calibration establishes a reference point or points that relate the detector output to actual or known values of the process You must make an calibration before the gauge can make measurements of any accuracy Perform the calibration after the installation and commission of the gauge at the actual field site You do not need to repeat the calibration procedures as long as certain critical process and equipment conditions remain the same See When a New Calibration May Be Necessary in this manual The gauge requires only a periodic standardization to compensate for changing conditions DSGH Technical Reference Manual 38 Calibration Current loop analog output calibration Calibrating the current loop adjusts the 4 20 mA output to a reference either the PLC DCS or a certified ammeter It forces the 4 mA and 20 mA outputs to the external reference The VEGA factory pre adjusts the current loop with a certified ammeter so it is very close to the outputs required To correlate the
67. ervice Engineer commissions the gauge To reduce service time and costs use this checklist to ensure the gauge is ready for commission before the Field Service Engineer arrives x Mount the source holder and detector per the VEGA certified drawings Allow access for future maintenance xw Make all wiring connections per the certified drawings and the Wiring the Equipment section in this manual Tie in the wiring from the field transmitter analog output to the DCS PLC chart recorder Ensure that the AC power to the DSGH is a regulated transient free power source UPS type power is the best x If using DC power verify that the ripple is less than 100millivolts Have process ready for calibration When possible it is best to have process available near both the low and high end of the measurement span A density change of at least 0 1SpG is a common requirement xZ When possible have the material that you use for periodic re standardization of the gauge available Frequently this is water xw Ifyou cannot meet any of these process conditions you can still calibrate the gauge however it is not as accurate x Do not remove the lock on the source holder Notify VEGA Field Service if there is damage to the lock or it is missing This does not apply if you are using a low activity source holder such as the SHGL 36 DSGH Technical Reference Manual Notes DSGH Technical Ref
68. es Addendum CD that came with the source holder and the appropriate current regulations for details Vertical pipe with upward flow Mount the measuring assembly on a vertical pipe with upward flow of the process material This position provides the best possible self cleaning action with a minimum possibility of gas or heavy solids collecting in the measuring section You can mount the gauge on a horizontal pipe but a vertical flow is preferable Keep the velocity above five feet per second to avoid build up on the pipe walls and to keep the heavier solids in suspension This is particularly true in sludge applications Pump considerations Mounting the DSGH near a pump can be good or bad depending on the application Check with VEGA application engineers for a recommendation on your application No line hammering The design of the DSGH requires operation in low vibration conditions Install it in a location with no line hammering or excessive vibration Quickly changing flow conditions may cause line hammering If necessary you can physically mount the DSGH apart from the vessel or pipe but notify VEGA at the time of the order to ensure proper source size and shielding Stable temperature Mount the DSGH on a portion of the line where the temperature of the process material is relatively stable Process temperature change results in a density change that may affect the gauge indication The amount of the effect depends upon the foll
69. esponder unit connect the HART modem jumpers anywhere along the 4 20 mA output Procedure 58 To connect directly to a Responder 1 Open Ohmview 2000 Launcher 2 Select the communication port number that connects to the HART modem 3 Click Connect The Responder Main Menu screen displays iix Connected to Tag Number ADD7_TOP Address 7 RS 485 Responder Port Selection 1 E Disconnect Main Screen Responder Function Exit Figure 43 Responder Main Screen The following choices are available on this menu e Responder Gauge Data see page 126 e Responder Function see page 127 e Connect or Disconnect Click to connect or disconnect from gauge e Exit Click to close program 130 DSGH Technical Reference Manual Special Applications Initial setup Perform the following steps to set up the GEN2000 RS 485 local network 8 9 Procedure 59 To set up the GEN2000 RS 485 local network Check the wiring connections for power network and analog output for all gauges Disconnect the RS 485 network from the master gauge Verify that the master gauges has no jumpers made address F Power up the master gauge Use the RS 485 configuration program to disable the RS 485 local network From the Main Screen pull down menu select Off Connected to Tag Number igi AR RS 485 E y Port Selection Main Screen Re connect the RS 485 wiring on the master gauge Note Wire the Maste
70. ess value indication of the gauge shows the actual density or percent solid measurement The 4 20 mA output however indicates the calculated mass flow value When setting up the gauge spans the PV span is the normal material density span or percent solids span but the current loop span is the actual span of the mass flow measurement 112 DSGH Technical Reference Manual Special Applications Installation requirements Interconnect for flow meter to DSGH Use of a flow meter input requires an VEGA analog input circuit board p n 243409 The analog input circuit board mounts to the top of the unit with mounting rackets p n 243563 The analog input kit is part number 243585 Use the J1 4 pin connector to wire the analog input board to the flow meter Table 25 Flow meter pin and connections J1 pin Flow meter connection 1 Signal 2 Signal 3 Not used 4 Not used The analog input circuit board interfaces with the CPU board through the 14 pin connector DSGH Technical Reference Manual 113 Special Applications Jumper settings for analog input board A jumper is required to select the type of analog input from the flow meter To a voltage or current transmitter GEN2000 power supply board gt P1 E RED BLK YEL GRN Baana Analog input board Figure 30 Mass flow Jumper settings Table 26 J2 Jumper block configuration RTDIAanaoguse
71. est mode Sensor test mode The sensor test mode simulates the sensor output at a user defined number of raw counts This is before application of the following e Temperature compensation e Sensor uniformity gain e Standardize gain The true sensor output is ignored while the transmitter is in sensor test mode Sensor test mode is extremely useful for verifying the electronics and software response to input counts without having to perform the following e Change the process e Shield the source e Vary the radiation field DSGH Technical Reference Manual 59 Advanced Functions While in sensor test mode after entering the desired number of counts it may be useful to look at the Process chain screen to view the variables affected by the raw counts value To view the Process chain screen back out of the test mode screens using the LEFT ARROW The transmitter continues to operate in sensor test mode until it times out after one hour or until you choose Exit test mode Start sensor test mode Procedure 16 To start the Sensor test mode 1 From the Main menu select Advanced Fxns Test mode Sensor test mode Enter test mode 2 When prompted enter the value of the new counts you want to force 3 At the prompt select Yes to start the test mode and send new data 4 The transmitter continues functioning in sensor test mode until it times out after one hour or until you choose Exit test mode Exit sensor test mode Procedure
72. evious section Algorithm for mass flow to see how to use these parameters Note When using Ohmview 2000 to set up you mass flow verify that you have selected the correct flow units 118 Ohmview 2000 Version 2 0 0 0 E iol x Eile Communication Utilities Monitor Help Tag DEMO Type Mass Flow Density Communication Statistics 100 Select Tabs Gauge Setup Cal Parameters PV Units Spans Filtering Source Functions System Info Aux Input Mass Flow Process Info Flow Units Vol Time Setup C liter sec maxflowvalue 0 000 Calibration C mamn Aea 0 000 C m3 min Gauge Info DEE 5 000 Diagnostics s gel hr max mass flow Selly min mass flaw 000 Alarms C gal sec ft3 hr Linearizer Type C f3 min mass flow gain 0 0000 C ft3 sec Table Non linear rStatus Flow Rate Value 5 000 l sec Mass Flow Value 5 000 deg F Disconnect OHMART Figure 32 Ohmview 2000 Mass Flow tab DSGH Technical Reference Manual Special Applications Flow meter units Units of the flow rate choose from Table 28 Flow unit options gal hr frr mmn gaimin tmn o Min Flow Value The minimum expected flow rate Max Flow Value The maximum expected flow rate Min Mass Flow The minimum allowable mass flow value as the gauge calculates This is a read only value Max Mass Flow The maximum allowable mass flow value as the gauge calculates This is a read
73. for installation and operation in EX areas CINCINNATI OHIO U S A 45209 Patent No 6 198 103 GEN2000 IECEx CSA 09 0005X MODEL INPUT 115VA 25 W 50 60 Hz CONTACT RATINGS Tze Ex OHMARTVEGA MAR 2000 240VAC 2A OR 24VDC 2A OR 1 4HP 120VAC Ex d IIC T6 Ta 20 C TO 60 C OR Ex d IIB H2 T6 Ta 50 C TO 60 C IP66 WARNING USE A CABLE OR WIRING RATED FOR AT LEAST 90 C WARNING POTENTIAL ELECTROSTATIC CHARGING HAZARD SEE INSTRUCTIONS WARNING DO NOT OPEN WHEN AN EXPLOSIVE ATMOSPHERE MAY BE PRESENT Figure 1 IECex Label 16 DSGH Technical Reference Manual Specifications System 1 of span typical Accuracy Typical Cesium 137 Sources Cobalt 60 Power AC Requirements DC Wiring Signal Cable GEN2000 Electronics Housing Weight Current Loop Output Relay Output HART Communication Auxiliary Input Capability Electronics Diagnostics Maximum length HART signal 4 wire hookup with DC Certification to CSA and UL standards CENELEC certification Enclosure rating Ambient temperature Humidity Vibration Material Paint Detector housing Rating Power Software user settable Rating HART Protocol PC interface Optional hand held interface Type Possible function On board memory Real time clock LED indication Introduction Table 3 Specifications list Accuracy depends on specific application parameters 0 66MeV gamma radiation emitter 30 2 year half lif
74. for repairs 85 Cycle period 106 alarm setup 106 D Damping 92 Data collect 45 Data collection interval 90 using data collect on sample to check interval 45 Date 97 Default standardize density 90 degrees API 143 degrees Baume 145 degrees Twaddle 144 Descriptor user defined in System information 100 device description 21 diagnostic alarm acknowledging 71 messages 72 setting relay as 102 Diagnostic alarm 69 diagnostic history 75 Dither level 105 alarm setup 106 Dither time 106 alarm setup 106 E EEPROM corruption repair 61 Equation linearizer 44 F Fast response cutoff 93 147 Index Filt counts 59 filtering 91 damping 92 fast response cutoff 93 RC 92 rectangular window 92 Firmware version 65 Flash corrupt alarm setup 101 FLASH corrupt in diagnostic history 75 FLASH corrupt LED pattern 79 G gain 49 GEN2000 Local RS 485 Network 127 H hand held terminal 20 Hardware version 65 HART 20 HART Communicator 20 HART load resistance 20 High voltage displayed in process chain 58 History information 75 hot spot key 56 J jumpers 78 L LED indicators 79 Level instead of density is indicated See Select gauge type linear table 147 linearizer equation 44 equation vessel inner diameter parameter 98 linear table 45 147 non linear table 44 147 Linearizer choosing 44 Linearizer table using 147 low temperature application 109
75. g equipment e You must always use the same plates to ensure a consistent absorption of radiation This is a Substitute for the radiation absorption of the material in the pipe e The use of absorber plates requires emptying the pipe of process and access to the measuring assembly Note You cannot use absorber plates for the calibration You must determine the equivalent value of the absorber plates after the calibration of the DSGH with the gauge mounted on the pipe Advantages Absorber plates provide the greatest long term repeatability and precision in comparison to the other standardization methods Disadvantages Emptying the process from the pipe or vessel is not always possible You must have physical access to the measuring assembly and must use the same plates repeatedly Procedure 9 To standardize on absorber plates 1 From the Main menu select Initial setup Process parameters Cal parameters Process Std config Process Stdz Type 2 On the Process Stdz Type screen choose Use Default value 3 Enter the value of the absorber and press F4 Then the value of the absorber plates always appears as the actual value of the sample during the standardization procedure 50 DSGH Technical Reference Manual Calibration 4 Press F2 to send Performing a standardization Before performing standardization x Have the standardization material of known density ready to measure See Choosing a Standardization Method fo
76. ge the function for a unit perform the following steps Procedure 57 Changing the Responder unit function 1 Select the Function cell next to the unit number 2 From the pull down menu select the proper function type 3 Click Accept Function Communication Statistics Use this screen to view the number of times the Master unit has sent messages to the Responder units and the number of times the responder units have replied Communication Statistics a 10 x Connected to Communication Tag Number ADD 15 Statistics Address 15 AB RS 485 Master 7 ADD7_TOP MainScreen Figure 41 RS 485 Communication Statistics screen 128 DSGH Technical Reference Manual Special Applications Master Configuration Use this screen to setup the Polling requirements for each unit Polling activates the function for the unit To turn the polling On or Off double click on the Poll cell next to the unit number Master Poll Configuration p lol xj Connected to Master Tag Number ADD 15 Poll Configuration Address 15 ABR RS 485 Master To Change data 1 Click On any Poll cell 2 Press Change Setting Urt e ADD7_TOP Double click l to toggle On Change Setting MainScreen or Off Click to change poll settings Figure 42 RS 485 Master Configuration screen DSGH Technical Reference Manual 129 Special Applications Responder Main menu To setup and test a specific r
77. gnitude in mA above and below the average output of the current loop dithering Default value 1mA Cycle period Cycle period is the repetition rate for presenting the current loop dither in x ray interference output mode Default value 1s Dither time Cycle period is the percentage of the cycle period to output the dither Default value 1 Table 18 X ray alarm conditions Threshold Dither level Dither time Cycle period Setting up the x ray alarm parameters 98 DSGH Technical Reference Manual Initial Factory Setup Procedure 50 To set the x ray alarm parameters 1 From the Main menu select Initial setup 2 From the Initial setup menu select Alarms 3 From the Alarms menu select Mode configuration 4 From the Mode configuration menu select Xray alarm 5 Edit the following values as necessary e Threshold e Dither level e Cycle period e Dither time 6 If using a hand held Communicator press F2 to send the changes to the transmitter Setting the relay as an x ray alarm Procedure 51 To set the relay as an x ray alarm 1 From the Main menu select Initial setup 2 From the Initial setup menu select Alarms 3 From the Alarms menu choose Sel relay function 4 From the Sel relay function menu select X ray 5 Press F4 to enter 6 If using a hand held HART Communicator press F2 to send the setting to the transmitter Auxiliary input settings The auxiliary input is an option for the DSGH to receive a frequ
78. he order of minutes Electrical and source noise occur on the order of seconds so they can be filtered out with a low pass filter leaving only the change in the process variable in the signal RC exponential RC exponential filtering simulates the traditional Resistance Capacitance filtering It provides an infinite impulse in which all of the previous samples contribute less and less to the average but all contribute somewhat The most recent samples are weighted most heavily in computing the average Compared to rectangular window filtering RC exponential filtering provides a quicker response to step changes in the process but has a larger noise band Damping 20 v z E qh EE 63 Qa 1 i oC 1 n 1 pemi 1 Time t 1 Time Constant Figure 23 RC exponential filtering Rectangular window filtering Computes an average based only on a specified finite number of samples All samples are weighted equally in the average Although it provides a slower step response since the most recent measurements are weighted the same as those further back in time it produces a less noisy signal Generally rectangular window linear averaging by itself produces results similar to combining RC exponential filtering with the fast cutoff feature Sample Weighting Sample Current Sample Figure 24 Rectangular window filtering Damping The damping function depends on what type of filter is chosen
79. he setups that follow DSGH Technical Reference Manual 111 Special Applications Setting up temperature compensation with a linear device Procedure 54 To set up temperature compensation with a linear device 1 Calculate the value of the device temperature coefficient D1 by using the following equation D1 Temperature span Analog Input High Calibration value Analog Input Low Calibration value 2 Calculate the value of the device temperature coefficient DO by using the following equation DO Max Temperature coefficient D1 x Analog Input High Calibration value 3 Set the device temperature coefficient D3 to 0 For example suppose you have a 0 to 10V temperature measurement device with a temperature span of 20 C 200 C The configuration of the analog input circuit board is for an input range of 0 to 10V Set the analog input signal to 10V and perform an Analog Input High Calibration to find out the highest output frequency of the Analog Input Circuit Board For this example assume this value is set at 29 760 Hz Set the analog input signal to zero volts and perform an Analog Input Low Calibration For this example assume 100 Hz Device Coefficient D1 200 20 29760 100 0 006069 Device Coefficient D0 200 006069x29760 19 39 Mass flow measurement Mass flow measurement with a flow meter input into the DSGH provides a mass time indication When using the mass flow measurement the PV proc
80. heck power input terminals 1 2 Check loop wiring and jumpers JP1 JP2 on Power Supply board Replace Power Supply board Check against relay output terminals 3 4 amp 5 If no relay output replace Power Supply board CPU Board LED summary table Table 12 CPU board LED summary LED Description Normal condition Mem Memory OFF corruption EEPROMs FLASH HART HART ON blinks when communicatio receiving HART n indicator messages CPU Central Blinks at rate of 1 time processing per second unit on CPU board heartbeat Aux Auxiliary input Blinks if auxiliary input frequency present OFF if no signal auxiliary input present indicator HV Sensor high ON high voltage is in voltage spec Field Radiation field Cycles in proportion to indicator radiation field intensity at detector ON for 10 seconds for each mR hr then off for two seconds Can use LED 5 that blinks 1 time sec to time LED 9 for field indicator 76 Error condition 1 blink CPU EEPROM corrupt 2 blinks Sensor EEPROM corrupt 3 blinks Both EEPROMs corrupt 4 blinks RAM corrupt 5 blinks Memory mismatch ON solid combination of errors None LED does not blink CPU not functioning None OFF high voltage is out of spec None Recommendation Check software diagnostics Call VEGA Field Service Check HART device connection on loop and HART device functioning Check power input Replace CPU board Check auxili
81. his is not necessary if you have a SHGL source holder Note Most source holder models accept a lock Call VEGA Field Service immediately for further instructions at 513 272 0131 if the source holder has one of the following conditions Does accept a lock and there is no lock on it The lock is not secured You are unable to secure the lock The operating handle does not properly move into the off position DSGH Technical Reference Manual Introduction Storing the equipment Storing the source holder If it is necessary to store the source holder do so in a clean dry area Be sure the source holder shutter is in the OFF or CLOSED position not required for a SHGL source holder Check the current local regulations U S NRC Agreement State or other to determine if this area must have any restrictions Storing the detector Avoid storage at temperatures below freezing Store the detector indoors in an area that has temperature control between 10 C and 35 C 50 F and 95 F and less than 50 relative humidity Keep the equipment dry until installation Certifications This gauge is designed for certification compliance from the following agencies e ATEX Standard e CCOE India e CEPEL INMETRO Brazil e CSA e FM Standard e IECex e JIS Japan e KTL Korea e NEPSI China DSGH Technical Reference Manual 15 Introduction Safety Information for EX Areas Please note the EX specific safety information
82. ication signals on the standard 4 20 mA current loop To function the minimum load resistance on the 4 20 mA loop must be 250ohms Q Refer to the instruction manual for your HART Communicator for information on the following e Key usage e Data entry e Equipment interface DSGH Technical Reference Manual 21 Introduction HHH HART Communicator alel lle GE aie oc Vf lt n a 1 lus D a i D XN Figure 5 HART hand held communicator In order to effectively use the features in VEGA s density gauge you must use VEGA s device description DD to program the HART communicator You may purchase a universal hand held terminal programmed with the device through VEGA VEGA part number 236907 Use firmware 2000 00 or higher when you use the hand held HART communicator to make temperature or mass flow compensation See Appendix Il Special Applications for further information concerning compensation methods 22 DSGH Technical Reference Manual Introduction Using VEGA View software on a PC When you use an IBM compatible personal computer to communicate with the DSGH or other VEGA HART transmitter field device you must have a HART modem and VEGA View software The VEGA View software kit part number 237857 includes the following e Modem e Cables e Software e Manual VEGA View software is a DOS program that emulates the HART Communica
83. identifications 72 Figure 21 CPU board and power supply board simplified component layout 73 Figure 22 LED indicators 75 Figure 21 RC exponential filtering 86 Figure 22 Rectangular window filtering 86 Figure 25 X ray interference alarm output 98 Figure 26 Temperature compensation system 103 Figure 27 RTD input interfaces with circuit board 105 Figure 28 DSGH wiring and jumper connections 106 Figure 29 Ohmview 2000 Temperature Compensation tab 109 Figure 30 Mass flow Jumper settings 114 Figure 31 Mass flow input interfaces with the circuit board 115 Figure 32 Ohmview 2000 Mass Flow tab 118 Figure 33 Typical installation RS 485 local network 122 Figure 34 Interconnect GEN2000 RS 485 multiple detectors transmitters 123 Figure 35 Ohmview 2000 Launcher program 124 Figure 36 Ohmview 2000 RS 485 main screen 125 DSGH Technical Reference Manual 7 Preface Figure 37 Figure 38 Figure 39 Figure 40 Figure 41 Figure 42 Figure 43 Figure 44 RS 485 Master Main menu screen 125 RS 485 Responder gauge data screen 126 RS 485 Responder Function screen 127 Responder function pull down menu 128 RS 485 Communication Statistics screen 128 RS 485 Master Configuration screen 129 Responder Main Screen 130 Calibration with non linear table linearizer flow chart 143 Figure 45 Calibration with a linear table linearizer flow chart 145 DSGH Technical Reference Manual Preface Procedures Procedure 1 Calibrating
84. ientation in this case is for the source holders to be on the inside with radiation beams pointing away from each other DSGH Technical Reference Manual 29 Installation Mounting the measuring assembly You can mount the density gauge on the pipe by positioning the detector housing and source holder brackets with the bolts that VEGA provides If the pipe has insulation the DSGH and source holder should have external support to prevent crushing of the insulation Note The handle on the source holder operates a rotating shutter When installing or removing the assembly from the pipe you must turn the handle to the closed or Off position and lock the handle with the combination lock that VEGA provides This does not apply if you have an SHGL low activity source holder se Ea Vessel wall A a 77 _ Insulation if any Sensor electronics Clear space 10 preferred 6 minimum External ground obey terminal Figure 10 Mounting the detector 30 DSGH Technical Reference Manual Installation Wiring the equipment Note If the instructions on the drawing differ from the instructions in this manual use the drawing It may contain special instructions specific to your order Use the drawing notes and the steps that follow to make the input and output connections Make the connections at the removable terminal strips mounted on the power supply board Access the power supply board by removing th
85. ilter This value relates to the current loop output 54 DSGH Technical Reference Manual Advanced Functions Process variables The display values for the Process variables screen are Counts low Displays the counts low that is the temperature and sensor uniformity gain compensated counts from the sensor at the Cal Low Density Determination of the Cal low density is made during the calibration procedure Counts high Displays the temperature and sensor uniformity gain compensated counts from the sensor at the Cal High Density Determination of the Cal High Density is made during the calibration procedure Max Density Displays the maximum density that is the value in process units as entered in the Initial setup screens Use this to calculate the measurement span Min Density Displays the minimum density that is the value in process units as entered in Initial setup screens Use this to calculate the measurement span Temp comp gain Displays the current value of the temperature compensation gain Use this to adjust for inherent sensor output change with temperature Uniformity gain Displays the current value of the uniformity gain Use this to force all DSGH sensors to output the same counts at a given radiation field Source decay gain Displays the current value of the source decay gain Use this to compensate for the natural decay of the radiation source which produces a lower field over time Stdz gain
86. ing Can you remove the source holder lock If you are in doubt whether you have permission to remove the source holder lock Do not The license sets limits on what the user can do with the gauge Licenses fall into two categories 4 General 5 Specific It is up to the user to review the license to determine if they have the appropriate permission to perform any of the following tasks to the source holder e Disassemble DSGH Technical Reference Manual 35 Installation e Install e Relocate e Repair e Test e Unlock You can remove the source lock if installation of the gauge is in the U S and you have the specific license to remove the source holder lock Confirm that your license specifically states that you have the permission to perform this operation and then contact VEGA Field Service Radiation Safety for the combination Do not remove the lock if the gauge has a general license tag installation is in the U S and you do not have the specific license that gives you permission to remove the lock You can verify whether the gauge is a general license gauge by checking the source holder for the general license tag If it is not there it is not a general license device If you do not have permission to remove the source holder lock an VEGA Field Service Engineer or another person with this specific license must remove it for you Field service commissioning call checklist In many U S installations an VEGA Field S
87. ion concerning this feature GEN2000 Local RS 485 Network This feature supports gauging systems that require two or more measurement systems that interact to provide a single compensated measurement The RS 485 network has the following gauge types e Master e Responder The gauges use the half duplex RS 485 communication network The gauges transfer specific information between each other in the field with only the master gauge actually communicating with the control room The master gauge has the following features e Initiates all communication on the network e Keeps a list of expected gauges on the network and cycles through each gauge requesting a response e Update the tag count information from the responder gauges and track the network health The responder gauges have the following features e Have aunique address for their reply e Have a table listing other network gauges with information that it requires and the function of that data e Caan listen to all of the responses of the other gauges which enables each responder gauge to update the count information from other gauges if setup to do so DSGH Technical Reference Manual 121 Special Applications Installation requirements Figure 33 Typical installation RS 485 local network Figure notes 1 122 Radiation source holder Radiation beam Minimum process density measured Radiation detector DSG with HART protocol output using RS 48
88. ions mix to make a third generally use percent solution The DSGH directly measures only the total mass in the volume between the detector and source holder This is equivalent to a direct measurement of density mass volume since the volume remains constant Effective density Dg is the directly measure quantity in a percent solid or percent solution application When the DSGH indicates percent solid or percent solution it is indicating a derived quantity The density in SpG specific gravity of both the carrier Cspg and the solid product Pspq must be constant and known The basis for the percent solid or percent solution internal calculation is the following e Effective density e Carrier density e Product density Note When the DSGH is set up as a percent solid or percent solution gauge the current loop 4 20 mA varies linearly with the percent solids or percent solution It does not vary linearly with the effective density The calculation of percent solid and percent solution uses the following variables e Cgpa density of carrier liquid in specific gravity e Pgpq density of solid product in specific gravity if product is a liquid liquid solution this is the specific gravity of the second liquid e Dey effective density of slurry or solution as measured by the DSGH The DSGH calculates the percent solid for slurries with the following equation Det Cspa xP Psp Cspa i solid Der x100 DSGH
89. ires the following e Measurement with the DSGH of the high process sample e Entry of the actual density This sets the gain of the calibration curve Perform this procedure either before or after setting the low density but only after you correctly enter the process span in the Initial setup screen 46 DSGH Technical Reference Manual Calibration Note You must perform data collection for the low and high density within ten days of each other for a good calibration The low and high values must be more than 10 of the process span apart for the most accurate calibration Increasing the process span usually increases the gauge accuracy Before starting the cal high data collection w Fill vessel or pipe with high process x Prepare to draw a sample while the gauge collects data Setting the cal high density Procedure 5 To set the cal high density 1 From the Main menu select Calibrations Initial cal Two point cal Set Cal high densi 2 The prompt Set Process To High Calibration Point Take Data displays Select Yes to allow the data collection to take place The on screen counter displays the time left If necessary press F3 to discontinue data collection 3 After data collection the screen prompts you to input the actual value The actual value is the value from the lab in engineering units Note Has data collect for the low density sample been performed yet If not do so now Then return to step
90. its in Initial setup screens Are linear units and vessel inner diameter set correctly Change linear units and vessel inner diameter in Initial setup screens Is process span set correctly Change measurement span in Initial setup screens Compare setting in Initial setup System parameters Source type screens to source holder label and change if necessary Is source type set correctly Is linearizer type set as equation Select Equation as linearizer in Calibrations Linearizer screen Check repeatability with data collects Perform Two point cal procedure in Initial cal screens Figure 17 Density two point calibration flow chart 42 DSGH Technical Reference Manual Calibration Table 5 Flowchart steps and manual heading Step in flow chart Manual heading Page Check process engineering units Units 82 Check linear units and vessel inner System parameters linear units and vessel 90 diameter inner diameter Check process span Span settings and process span 88 Check linearizer type Choosing the linearizer type 43 Check the repeatability of measurement Checking the gauge repeatability 44 Performing two point calibration Recommended two point process 45 calibration Choosing the linearizer type The DSGH calibration curve is non linear due to the measurement method of radiation transmission A linearizer
91. ity 1 From the Main menu select Initial setup 2 From the Initial setup menu select Process parameters 3 From the Process parameters menu select Process units 4 From the Process units menu select Density units 5 From the Density units screen scroll through the list and choose the correct density unit for your process by pressing F4 to enter You will need to enter a custom unit if the unit you want is not in the list See the procedure for setting custom units in this section 6 After selecting the units press F2 to send the information to the transmitter This ensures that other setup and calibration functions you perform use the desired engineering units Setting custom units Procedure 33 Setting custom units 1 From the Main menu select Initial setup DSGH Technical Reference Manual 83 Initial Factory Setup 2 From the Initial setup menu select Process parameters 3 From the Process parameters menu select Process units 4 From the Process units menu select Custom units 5 From the Custom units screen select Conversion to SPG 6 Enter the conversion factor in custom units per specific gravity 7 Press F4 to enter 8 Press the LEFT ARROW to move back to the Process units menu 9 From the Process units menu select Density units 10 Inthe Density units screen select Spel as the units 11 If using a hand held HART Communicator press F2 to send the units to the transmitter This ensures that other setu
92. l When you insert the disk into your CD drive the program automatically starts installing these programs onto your hard drive Note The HART Communication Server must always be on when using Ohmview 2000 s main program and Ohmview 2000 Logger Ohmview 2000 version 1 0 2 Compatible with Windows 95 98 2000 NT and XP Software for Ohmart level and density gauges Part 243008 Figure 8 Example of an Ohmview 2000 CD label DSGH Technical Reference Manual 25 Introduction The HART screens menu structure In both the hand held HART Communicator and the VEGA View or Ohmview 2000 software the user interface for HART functions is in a menu structure When the HART Communicator VEGA View or Ohmview 2000 starts up the Online menu displays For a detailed list of HART screen sub menus see Appendix IV of this manual 26 DSGH Technical Reference Manual Installation Chapter 2 Installation Testing on the bench To ensure a quick start up after installation you can test the detector assembly with the HART compatible communication device either a universal hand held terminal or a personal computer with a HART modem and VEGA software Bench testing enables you to check the following e Power e Communication e Initial setup software parameters e Some diagnostics Terrrinds 13814 250 to 800 ohm load reistor action Mini dips Eaters meas wi HART modem Transritter PS 222 cebl
93. ld service 80 Returning equipment for repair to VEGA 80 APPENDIX I INITIAL FACTORY SETUP 82 Process parameters 82 Units 82 Calibration parameters 84 Filtering 85 Type RC exponential or rectangular window 86 Span settings 88 4 DSGH Technical Reference Manual Current loop span 88 System parameters 90 Time 90 Date 90 Linear units 90 Vessel Inner Diam 91 Source type 91 Source function 92 System information 93 Setting up alarms 94 Diagnostic alarm setup 94 Analog alarm setup 96 Process alarm setup 96 X ray alarm setup 97 Auxiliary input settings 99 Input parameters 100 Multiple DSGH gauge input 100 Custom 100 APPENDIX II SPECIAL APPLICATIONS 102 Internal heater kit for applications rated to 50 C 102 Process temperature compensated density 103 Installation requirements 104 Analog input circuit board calibration 107 Initial settings and calibration requirements 108 Platinum 100 RTD temperature to frequency 111 Mass flow measurement 112 Installation requirements 113 Algorithm for mass flow 116 Mass flow parameters 118 Calibrating the analog input 120 Material present absent detector or point level detector with quick relay response 121 GEN2000 Local RS 485 Network 121 Software 124 Responder Main menu 130 Initial setup 131 Auto Zero feature 134 APPENDIX Ill SPECIAL UNITS INDICATION 136 Percent solid or percent solution indication 136 Degrees API indication 138 Degrees Twaddle indication 139 Deg
94. menu select Linear units 4 From the Linear units menu select one of the following 90 DSGH Technical Reference Manual Initial Factory Setup e in e ft e cm e mm e m Press F4 to save the date setting If using a hand held HART communicator press F2 to send the updated parameters to the transmitter Vessel Inner Diam Use the vessel inner diameter feature to view or enter the measurement for the inner diameter of the process flow pipe The system uses this number in the equation linearizer to calculate the density for a given count input 5 6 Procedure 41 Setting vessel diameter measurement From the Main menu select Initial setup From the Initial setup menu select System parameters From the System parameters menu select Vessel Inner Diam In the Vessel Inner Diam screen enter the new value Press F4 to save the new value for the vessel inner diameter Press F2 to send the updated parameters to the transmitter Source type Use the Source type feature to view or enter the isotope in the source holder that produces the radiation signal You can check the isotope type against the source holder label Procedure 42 Setting the source type From the Main menu select Initial setup From the Initial setup menu select System parameters From the System parameters menu select Source type In the Source type screen select one of the following source types e Cs 137 e Co 60 e Am 241 e Cf 252 e No source DSGH T
95. method Procedure 2 Choosing a linearizer method 1 From the Main menu select Calibrations Linearizer Select linearizer 2 On the Select linearizer screen the current linearizer displays on the second line 3 From the Select linearizer screen select either e Table non linear e Table linear e Equation 4 Press F4 to enter Note that VEGA recommends Equation for most applications Checking the gauge repeatability Check the DSGH measurement repeatability before performing the calibration Access the Data collect function in the Data Collect screen from the Calibrations menu to enable simple measurement of the process without altering the calibration or standardization values It enables the system to measure the process and report the number of sensor counts For more information about counts and the calculations performed to produce the final process value see the Process Chain section in the Advanced Functions chapter You can perform a data collect three or four times on the same sample to check the repeatability of the sensor If the sensor counts vary widely you should increase the Data collection interval parameter from the Initial setup menu Process parameters menu Data coll interval screen Refer to page 84 44 DSGH Technical Reference Manual Calibration Performing a data collect Procedure 3 Performing a data collect 1 From the Main menu select Calibrations Data collect 2 At the prompt sel
96. n one meter from the operator control station Output current loop Output signal is 4 20 mA into 250 8000hms Q HART communication protocol BEL202 FSK standard is available on these connections The output is isolated to standard ISA 50 1 Type 4 Class U When using signal current loop or 4 20 mA output cables that VEGA did not supply the cables should meet the following specifications e Maximum cable length is 1 000m 3 280ft e All wires should be 18 or 22AWG 1 02 or 0 643mm e If using DC power signal and power can run on a single cable 4 wire hookup two wires for power two for 4 20 mA Communication The HART hand held terminal can connect anywhere across the 4 20 mA wires to communicate with the DSGH A minimum requirement is a 250Q load resistance on the current loop The hand held terminal is Fisher Rosemount HART Communicator Model 275 or equivalent VEGA number 236907 A HART modem can also connect across the 4 20 mA wires to enable communication between the DSGH and an IBM compatible PC Process alarm override switch If the output relay is set as a process alarm relay high or low density alarm you can install an override switch to manually deactivate the alarm If you do not install an override switch the process alarm relay de energizes only when the measured density is out of the alarm condition The function of the output relay is set in the Alarms screen from the Initial setup menu 34
97. ng after acknowledging the alarm cycle power to the unit If alarm occurs again it indicates a hardware problem Perform the procedure Repairing corrupted EEPROM on page 58 Not used in standard software Consult VEGA special software Not used in standard software Consult VEGA special software Source holder shutter check is due Acknowledge the alarm by logging a shutter check in the Source function screen from the Initial setup System parameters menus See page 77 for details The CPU board detects a configuration mismatch The CPU board or sensor assembly may have been replaced or one of the EEPROM configurations is erroneous Refer to page 57 for more information Less than one count seen in the last 10 seconds Configurable by Field Service Indicates the sensor is malfunctioning The current process value is not within the limits set by the Max density and Min density in the gauge span settings High voltage on the PMT is outside usable range Check wiring on CN2 69 Diagnostics and Repair Analog alarm If the current loop output analog output is stable at either 2mA or 22mA the analog alarm is set The analog alarm is set when the counts from the detector falls below a threshold set by VEGA indicating that the detector is not outputting enough counts to make a meaningful measurement This is also known as zero counts If the analog alarm is on check the following x Source holder shutter is
98. nt counts that express as a percent of the counts at the high and low endpoints of the calibration determined with the two point calibration This quantity shows where the current measurement is in relation to the total count range count range 100 x C Cs CL Cy where Cs sum counts C_ CH counts at Cal Low Density and Cal High Density C CyH counts range DSGH Technical Reference Manual 53 Advanced Functions of span The percent process span indicates the measurement value as a percent of the measurement span The maximum and minimum density values are input in the Initial setup screens A graph of percent count range vs percent process span indicates the non linearity of the radiation transmission measurement If using a table linearizer the values in the table are percent count range and percent process span counts range 50 F 30 process span Figure 18 Percent counts range vs percent process span Raw Dnsity Displays the raw density that is the calculated density in SpG specific gravity units unfiltered by time constant or rectangular window filter Uncomp Den Displays the uncompensated density that is the density of the process before any process compensation An example of this is the value of the process density before temperature or mass flow compensation PV Displays the process value that is the density or other indication in engineering units after applying the f
99. nter a short message or note for the operator Press F4 to save If using a hand held HART Communicator press F2 to send the updated parameters to the transmitter DSGH Technical Reference Manual 93 Initial Factory Setup Setting up alarms Four types of alarms are available 1 Diagnostic 2 Analog 3 Process 4 X ray The Diagnostics and Repair chapter thoroughly explains use and acknowledgement of alarms When you set up alarms the following options are available e Which alarm type triggers the output relay e Which diagnostic messages appears on the HART display screens e The output level of the analog alarm e Specialized parameters of the x ray alarm Diagnostic alarm setup Diagnostic alarms give information about the condition of the DSGH and can provide reminders to perform periodic maintenance procedures The reminders appear as messages on the HART screens when a HART device connects to the DSGH In addition if the DSGH relay is set as a diagnostic alarm the condition trips the relay on In the setup there is a list of every possible diagnostic alarm condition that can flag On or Off If the condition flag is Off that condition does not cause the diagnostic alarm relay to trigger and no HART message appears The following table lists the available diagnostic alarms conditions See the Diagnostics and Repair chapter page 69 for more details Table 15 Diagnostic alarm conditions RAM corrupt Stand
100. ntrolling from the transmitter s current output be sure to remove the system from automatic control before entering a test mode The software screens prompt you to do so before entering test mode DSGH Technical Reference Manual Advanced Functions Milliamp output test mode Use the milliamp output test mode to manually force the current output to a specified value This is useful for verifying the current loop calibration Instructions to calibrate the current loop are available in the Calibration chapter of this manual Note While in milliamp test mode the HART communication may post a Status error This is expected and not an indication of a failure If the message Status Error lIgnore Next xx Occurrences displays select Yes to ignore the Status Error Start milliamp output test mode Procedure 14 To start the mA output test mode Ale From the Main menu select Advanced Fxns Test mode mA Out test mode Enter mA test mode 2 At the prompt enter the value of the current output you want to force 3 At the prompt select Yes to start the test mode and send new data 4 The transmitter continues functioning in milliamp test mode until it times out after one hour or until you choose Exit mA test mode Exit milliamp output test mode Procedure 15 To exit the mA output test mode 1 From the Main menu select Advanced Fxns Test mode mA Out test mode Exit mA test mode 2 At the prompt select Yes to exit the t
101. nuclear regulatory agency separately with source holder and following instructions Source wipe and shutter check recording The DSGH can automatically remind users when a source wipe and shutter check are due using the diagnostic alarms If you use this feature you must record the source wipes and shutter checks in the DSGH to acknowledge the alarm and to reset the timer Perform the following procedure after a source wipe or a shutter check see the Radiation safety instructions shipped with the source holder DSGH Technical Reference Manual 77 Diagnostics and Repair 7 Recording a source wipe or shutter check Procedure 28 To record a source wipe or shutter check From the Main menu select Initial setup From the Initial setup menu select System parameters From the System parameters menu select Source function From the Source function menu select Record wipe or select Record shut chk At the prompt select Yes to start recording Press F2 to save Check when the next source wipe or shutter check is due Procedure 29 To check the due date of the source wipe or shutter check From the Main menu select Initial setup From the Initial setup menu select System parameters From the System parameters menu select Source function From the Source function menu select Next wipe shut due From the Next wipe shut due menu select Next wipe due to view the due date From the Next wipe shut due menu select Next shut chk due to view
102. oint energizes the relay Process alarms only work in conjunction with the output relay No HART messages post that relate to the process alarm You cannot use a relay as a diagnostic or x ray alarm if you have set it as a process alarm Table 17 Process relay set alarm conditions Relay action limit High limit Relay action limit Low limit Relay setpoint 96 DSGH Technical Reference Manual Initial Factory Setup Setting up the process alarm Procedure 49 Setting up the process alarm 1 From the Main menu select Initial setup 2 From the Initial setup menu select Alarms 3 From the Alarms menu choose Sel relay function 4 From Sel relay function menu select Process and press F4 to enter 5 Press the LEFT ARROW key to return to the Alarms menu 6 From the Alarms menu select Mode configuration 7 From the Mode configuration menu select Process relay set 8 From the Process relay set menu select Relay action 9 From the Relay action screen select either High limit or Low limit 10 From the Process relay set menu select Relay setpoint 11 From the Relay setpoint screen enter the numeric value of the alarm setpoint in process units and press F4 to enter 12 If using a hand held HART Communicator press F2 to send the setting to the transmitter X ray alarm setup The x ray alarm compensates for false indicated process values that occur when the gauge detects external radiographic sources Vessel weld inspe
103. only value Mass Flow Gain The gain term that is multiplied by the calculated mass flow value to compensate for any linearity problems Mass Flow Units The units of the 4 20 mA output as selected by the software Table 29 Mass flow unit output options kosee k min i These units are selected based on the time scale of the flow units and if the flow units are metric or English DSGH Technical Reference Manual 119 Special Applications Calibrating the analog input The analog input circuit board converts the input signal either a voltage or a current to a frequency output for the CPU board The frequency range of the output can vary up to 30 kHz for the maximum input level of the selected range The output frequency of the analog input circuit board does vary from board to board and therefore you must calibrate it for the working input range The following steps calibrate the analog input circuit board Calibrating the analog input circuit board Procedure 56 To calibrate the analog input circuit board 1 Set the input signal to the analog input circuit board to its lowest level 2 From the Main menu select Initial setup 3 From the Initial setup menu select Auxiliary input 4 From the Auxiliary input menu select Compensation 5 From the Compensation menu select Mass Flow or Temp 6 From the Mass Flow or Temp menu select Analog in Cal 7 From the Analog in Cal menu select Aux Low Input Cal e Atthe promp
104. order Otherwise you can enter it on this screen Setting the tag identifier Procedure 43 Setting the tag identifier 1 From the Main menu select Initial setup 92 DSGH Technical Reference Manual a fF oO Dh 6 Initial Factory Setup From the Initial setup menu select System parameters From the System parameters menu select Tag In the Tag screen enter the eight digit identifier for the instrument Press F4 to save Press F2 to send the updated parameters to the transmitter System information Message Use this text field available to record information or messages For example this is where you can record a message to operators or notes about the gauge Procedure 44 Setting the system information message From the Main menu select Initial setup From the Initial setup menu select System parameters From the System parameters menu select System info From the System info menu select Message In the Message screen enter messages or notes for the operator Press F4 to save If using a hand held HART Communicator press F2 to send the updated parameters to the transmitter Descriptor The Descriptor is a shorter message field to record information or messages Procedure 45 Setting the descriptor From the Main menu select Initial setup From the Initial setup menu select System parameters From the System parameters menu select System info From the System info menu select Descriptor In the Descriptor screen e
105. owing e Sensitivity of the gauge 28 DSGH Technical Reference Manual Installation e Temperature coefficient of the process material Temperature compensation is available but requires an VEGA temperature probe in the process as an input to the DSGH No air entrainment Mount the DSGH on a portion of the line where there is no possibility of air or gas entrainment and where the pipe is always full of process material Air or gas entrainment in the process or a partially full pipe can result in an inaccurate gauge indication Standardization considerations The DSGH requires periodic standardization Use process absorber plates or other easily repeatable reference fluid such as water for this standardization You must be able to empty or fill the pipe with water if you plan to standardize with absorber plates or water Often you can purge the measuring section of a pipe by rerouting the process material through a bypass section Protect insulation If insulation is between the measuring assembly and the process protect the insulation from liquids The absorption of a liquid such as water can affect the gauge indication because the DSGH measurement includes the density of the liquid in the insulation Avoid source cross talk When multiple adjacent pipes or vessels have nuclear gauges you must consider the orientation of the source beams so that each detector senses radiation only from its appropriate source The best or
106. p and calibration functions use the correct engineering units Calibration parameters Data coll interval Data collection interval is the time in seconds over which the system collects a process sample measurement Use this interval time to collect data for calibration linearizer curve and standardization Warn cal span Warning percentage span calibration is the difference between the two calibration points cal low density and cal high density as a percent of density span that causes a warning to appear For a good calibration it is important for the two calibration points to be as far apart as possible The default value is 10 The user typically does not need to change this value for most applications Process stdz type Process standardize type determines how you enter the actual process value of a standardize sample If this is set as Use Lab sample value the software screens prompt entry of the sample value during a standardize If this is set as Use Default value the software always uses the Default standardize density as the sample value Default std 84 DSGH Technical Reference Manual Initial Factory Setup Default standardize density is the default density value in engineering units that you use in the standardization procedure At standardization enter the actual density of the absorber material to override this default Stdz interval Standardize interval is the interval in days between standardize alarms Th
107. prompted select Yes to reset the min max values Or select No to cancel 4 Press F2 to save New hardware or EEPROM corrupt The transmitter contains two electrically erasable programmable read only memory EEPROM chips The EEPROMs store all data specific to that sensor electronics pair for the installation The locations of the EEPROMs are e Onthe CPU board e On the sensor board Each EEPROM contains a backup of the other EEPROM The system monitors both EEPROMs at power up to assure an accurate backup If you install a new CPU board the EEPROM backups on the CPU do not match The software signals the discrepancy with the error message New Hardware Found The transmitter does not automatically perform a backup in case the discrepancy is not due to new hardware but some corruption of the EEPROM Note Only use the New hardware functions if you replace the CPU board and the sensor assembly is to remain on the same installation This function is not necessary if installing a completely new detector assembly The new detector assembly includes the CPU board and the sensor assembly Proper response to New Hardware Found message if new hardware has been installed When you install a new CPU board or a new sensor assembly you must verify installation in the New hardware screen This function enables new backups of the EEPROMs If anew CPU board has been installed Procedure 12 New Hardware Found message with new CPU board 1 F
108. r gauge relay as the RS 485 Network Fault relay Failure to use this relay can result in significant measurement error from incorrect compensation or no compensation Confirm that all of the gauges have a unique address jumper configuration When directly connected to a responder gauge the jumper address displays on the Main Main Screen Connected to Tag Number ADD _TY Address 7 RS 485 Responder gt Power up all network gauges Confirm all hardware is functioning properly DSGH Technical Reference Manual 131 Special Applications Procedure 60 To set up the GEN2000 RS 485 local network continued 10 Run the RS 485 configuration program and configure the master gauge to poll all of the gauges on the network F Master Poll Configuration E lol x Connected to Master Tag Number ADD 15 Poll Configuration Address 15 G 3 39 RS 485 Master To Change data 1 Click On any Poll cell 2 Press Change Setting ADD7_TOP Double click on the Poll cell to toggle On Click Change Change Setting Connected to Communication Tag Number ADD 15 Statistics Address 16 EJ RS 485 Master Us Sed Rocerve Tagid Une 1 J o Una 2 9 0 Urt 2 amn J Une s 0 o Une 5 0 i Une amp 0 Une est 73499 ADO7_TOP Urt 8 0 0 U9 0 0 Ura 10 0 a Une 11 eus any anon Une 12 0 0 Uni 13 0 g Une 14 3 0 Unt 15 0 0 ADO 1 ManSeren 12 Populate the master table to continuously poll all gauges 13
109. r guidelines on the appropriate choice Prepare to draw a sample while the gauge is collecting data Standardizing the gauge Procedure 10 To perform a standardization 1 From the Main menu select Calibrations Process stdz 2 The Process stdz screen prompts if you want to take data Select Yes if you are ready with the standardization material in the process pipe to continue the standardization procedure The timer counts down while it collects data 3 Depending on how the system is set up it displays one of the following e The message Gage Set up to Use Default Value indicates the system is using the default value as the actual value of the standardization material e A screen that displays the detector counts the calculated process value and a field for the user to input the actual value of the standardization material The prompt asks Edit Counts Select No to continue or Yes to input the average counts 4 Press F2 to send DSGH Technical Reference Manual 51 Advanced Functions Chapter 4 Advanced functions Functions that are not required for normal operation of the transmitter are grouped in the software menu structure under the heading Advanced Fxns These functions are primarily for use by VEGA personnel for advanced troubleshooting and repair This chapter gives a basic explanation of these functions Note VEGA strongly recommends users seek our advice before using any of these advanced functions
110. ration Some of these parameters are e Units e Data collect times Process parameters Units The following engineering units are available for density measurement e Density weight volume e Special custom units These units are Density e SpG specific gravity e g cm3 grams per cubic centimeter e kg m3 kilograms per cubic meter e degAPl degrees API e b ft8 pounds per cubic foot e g ml grams per milliliter e dBaum L degrees Baume light less than water e dBaum H degrees Baume heavy greater than water e deglwad degrees Twaddle e percent e b gal pounds per gallon DSGH Technical Reference Manual 82 Initial Factory Setup e kg l kilograms per liter e g l grams per liter e b Cuin pounds per cubic inch e ton cu yd short ton per cubic yard e solid percent solid e sol percent solution Note For important information regarding the following units refer to Appendix III Special Units Indication Degrees API Degrees Baume light or degrees Baume heavy Degrees Twaddle Percent solid Percent solution Custom units You can program a custom unit if the unit you require is not in the standard list Choose the unit Spel Special from the Units screen Enter the numeric conversion factor in the form x custom units spg or x custom units g cm Setting the process units for density applications Procedure 32 Setting the process units for dens
111. ration of the DSGH and the radiation source Time Current time in HH MM SS as set in the real time clock The time maintains during power failure for up to 28 days It is important to enter the correct time and date because they are used for several internal calculations Time reverts to 00 00 00 on clock failure Date Current date in MM DD YY month day year format The date reverts to 00 00 00 on failure Setting the time and date Procedure 39 Setting the time and date 1 From the Main menu select Initial setup 2 From the Initial setup menu select System parameters 3 From the System parameters menu select the Time and Date 4 From the Time and Date menu select Time e Enter the current time e Press F4 to save the time setting e Press the LEFT ARROW key to return to the previous Time and Date screen 5 From the Time and Date screen select Date e Enter the current Date e Press F4 to save the date setting 6 If using a hand held HART Communicator press F2 to send the updated parameters to the transmitter Linear units Use the Linear units feature to view or enter the units e g inches used in the vessel inner diameter parameter below The system uses this number in the equation linearizer to calculate the density for a given count input Procedure 40 Setting the linear units 1 From the Main menu select Initial setup 2 From the Initial setup menu select System parameters 3 From the System parameters
112. rd Figure 28 DSGH wiring and jumper connections Table 22 J2 Jumper block configuration RTD AnalogUse fC lijumpersopen O 0 5mA 0 10 mA 0 20 mA pf ae 13 and 14 11 and 12 15 and 16 11 and 12 106 DSGH Technical Reference Manual Special Applications Analog input circuit board calibration It is usually unnecessary to calibrate the analog input circuit board If it requires calibration refer to Calibrating the Analog Input on page 120 Algorithm for temperature compensation The temperature compensation algorithm adjusts the final density output based on the temperature characteristics of both the RTD temperature probe and the process material The algorithm equations require constants that you must enter in the Initial setup screens Table 23 Temperature compensation parameters and descriptions Parameter s Temperature Units Display units for the temperature C or F Reference Temperature Temperature that the density reading adjusts to Process Temperature Polynomial coefficients to linearize the process dependent on Coefficients the process material and how it changes with temperature Your process testing lab should determine these coefficients The process temperature is measured using a PT100 platinum RTD If using another linear device refer to page 111 Working with a linear temperature device The algorithm for a linear correction for process temperature is de dm Po P
113. re has the following menu components e Al Low Cal Cnts Average counts from analog input low density calibration e Aux Low Input Cal Use this function to calibrate the Analog Input board for the low input signal of the auxiliary span e Al High Cal Cnts Average counts from analog input high density calibration 110 DSGH Technical Reference Manual Special Applications e Aux High Input Cal Use this function to calibrate the Analog Input board for the high input signal of the auxiliary span For further information concerning the Analog in Cal feature see the procedure on calibrating the analog input circuit board in the Mass Flow section of this Appendix Platinum 100 RTD temperature to frequency For reference Table 24 gives the conversion of temperature in degrees C to the frequency output of the Platinum 100 RTD Table 24 Platinum 100 RTD temperature to frequency output Temp degC Frequency Temp degC Frequency Temp degC Frequency 100 26166 26 90 26595 87 80 27024 27 70 18638 35 27452 67 60 27878 64 50 28302 18 40 28725 73 30 20446 60 29148 06 20 29567 96 10 29986 65 0 10 22229 37 20 30 40 23555 83 50 23993 93 60 70 80 25300 97 90 100 16809 47 Working with a linear temperature device If you have a temperature device that is not an RTD but provides a linear voltage output as a function of temperature you can use the temperature compensation feature by performing t
114. rees Baume indication 140 APPENDIX IV USING A LINEARIZER TABLE 142 Non linear table 142 Table linear 142 Calibration using a non linear table linearizer 143 Calibration using a linear table linearizer 145 INDEX 147 DSGH Technical Reference Manual Preface Preface Table 1 Table 2 Table 3 Table 4 Table 5 Table 6 Table 7 Table 8 Table 9 Table 10 Table 11 Table 12 Table 13 Table 14 Table 15 Table 16 Table 17 Table 18 Table 19 Table 20 Table 21 Table 22 Table 23 Table 24 Table 25 Table 26 Table 27 Table 28 Table 29 Table 30 Table 31 Table 32 Table 33 Table 34 Tables Revision History 1 Explanation of symbols 11 Specifications list 17 Terminal names and descriptions33 Flowchart steps and manual heading 43 Alarm type outputs 66 Summary table of diagnostic alarm conditions 69 Power supply board test point labels and descriptions 74 CPU test point labels and descriptions 74 Jumper settings 74 Power supply board LED summary 76 CPU board LED summary 76 Periodic maintenance schedule 77 Example of settings for process values 89 Diagnostic alarm conditions 94 Analog alarm conditions 96 Process relay set alarm conditions 96 X ray alarm conditions 98 Heater kit part numbers 102 Analog circuit board to RTD pin and connections 104 Analog circuit board to GEN2000 power supply board pin and connections 104 J2 Jumper block configuration 106 Temperat
115. rom the Main menu select Advanced Fxns New hardware New CPU board 2 The prompt Verify New CPU Board Installed displays Select Yes to allow new backups on the EEPROMs or select No to cancel DSGH Technical Reference Manual 57 Advanced Functions 3 Press F2 to save CAUTION If you suspect that an EEPROM is corrupt we recommend you call VEGA Field Service for advice before performing the following procedure To repair the corruption from the EEPROM backup Procedure 13 Repairing corrupted EEPROM From the Main menu select Advanced Fxns New hardware No new hardware At the prompt Do You Want To Reconcile Differences displays Select Yes to allow restoration from backups on the EEPROMs or select No to cancel Press F2 to save Test modes Five independent test modes are available These test modes are 1 2 3 4 5 mA Out test mode Sensor test mode Aux Inp test mode Relay test mode Temperature test In the test modes the transmitter stops measuring the process material and allows manual adjustment of critical variables for troubleshooting Enable the test modes independently However you can use them in combination to test multiple variable effects All of the test modes time out automatically after one hour if you do not manually exit 58 CAUTION While in a test mode the transmitter is not measuring process and so its current output does not reflect the process value If your DCS is co
116. ry screens from the Gauge Status View History menus Some conditions are self repairing for example RAM and EEPROM corruption Therefore these may appear in the history screens but not in the diagnostic screens You can view the status of a diagnostic alarms in the Diagnostics screen from the Gauge status menu Acknowledging diagnostic alarms If a condition is in alarm you can acknowledge it turn it off in the Diagnostics screen from the Gauge status menu The following alarms are exceptions to this rule e Source wipe due e Shutter check due e Standardize due These exceptions acknowledge when the function performs Note If the relay is set as a diagnostic alarm you must acknowledge all diagnostic alarms to reset the relay DSGH Technical Reference Manual 67 Diagnostics and Repair Checking and acknowledging the diagnostic alarms with gauge status Procedure 27 Checking and acknowledging diagnostic alarms 1 From the Main menu select Gauge status 2 From the Gauge status menu select Diagnostics 3 The first diagnostic condition displays Press F4 to view all the conditions 4 If a diagnostic condition is in alarm you can either e clear the alarm by choosing Acknowledge alarm e orignore the alarm by selecting Continue 5 The message Current Status Complete displays after viewing all of the conditions Diagnostic alarm messages Active alarm messages may appear on the HART device if the alarm condition
117. s Process Std config Process Stdz Type 2 On the Process Stdz Type screen choose Use Default value 3 Enter the value Now the value of the water always appears as the actual value of the sample during the standardization procedure Press F4 to enter 4 Press F2 to send Standardization on process Measure process in the pipe with the DSGH and enter its lab measured density into the software to perform the Standardization on process Advantages Standardization on process is the easiest method It ensures the DSGH reads what the lab reads at that density DSGH Technical Reference Manual 49 Calibration Disadvantages It is not the most accurate or repeatable method In addition it relies on the laboratory for results Procedure 8 Standardization on process 1 From the Main menu select Initial setup Process parameters Cal parameters Process Std config Process Stdz Type 2 On the Process Stdz Type screen choose the Use Lab Sample value option 3 Enter the value of the sample and press F4 to enter 4 Press F2 to send Standardization on absorber plates The features of the absorber plates are e Plates are usually made of lead e Plates insert into slots in front of the DSGH detector for the standardization procedure e You can purchase absorber plates from VEGA e The use of absorber plates requires a mounting kit from VEGA This kit is usually specified at the time of the order however it can retrofit to existin
118. s Canadian and International Users manual and the Radiation Safety Manual References Addendum CD Please refer to this document for radiation safety information DSGH Technical Reference Manual 13 Introduction Unpacking the equipment NS N WA K 14 CAUTION Make sure that you are familiar with radiation safety practices in accordance with your U S Agreement State U S NRC or your country s applicable regulations before unpacking the equipment Unpack the unit in a clean dry area Inspect the shipment for completeness by checking against the packing slip Inspect the shipment for damage during shipment or storage If the detector is included as a separate package in the shipment inspect the assembly for damage that may have occurred during shipment or storage If there was damage to the unit during shipment file a claim against the carrier and report the damage in detail Any claim on the VEGA for shortages errors in shipment etc must be made within 30 days of receipt of the shipment If you need to return the equipment see the section Returning equipment for repair to VEGA in the Diagnostics and Repair chapter After you unpack the equipment inspect each source holder in the shipment to assure that the operating handle is in the OFF position In the event that you find the handle in the ON position place it in the OFF position immediately and secure it T
119. s configuration data to disk e Off line editing of configurations Ohmview 2000 ersion 1 0 1 0 ioj x File Communication Utilities Monitor Help Firmware Version 1 00 Tag DEMO Type Density a7 7 Communication Statistics 100 Select Tabs Filtering Source Functions System Info Aux Input Process Info Gauge Setup Cal Parameters PVUnits Spans Setup Gauge Type Calibration C Level Gauge Info Diagnostics Transmitter Location Alarms Local Linearizer Type C Remote Equation Sins Linearizer Type Equation C Table Non linear C Table Linear Figure 7 Ohmview 2000 software 24 DSGH Technical Reference Manual Introduction Note There are some minor differences in operation of the Ohmview 2000 software and the hand held communicator Most significantly Onmview 2000 software writes entries immediately to the transmitter but a communicator only sends changes after pressing F2 to send This manual s instructions are for the hand held communicator but most procedures use exactly the same steps Refer to the Ohmview 2000 Electronic User Manual that accompanies the software diskette for complete instructions for using Ohmview 2000 software The Ohmview 2000 software includes the main Ohmview 2000 software HART Communication Server Launcher program RS 485 Network Configuration Ohmview 2000 Logger Ohmview 2000 File Configuration and the Ohmview 2000 Electronic User Manua
120. sity procedures in any sequence in Initial cal screens Collect linearizer data on known samples using the function Collect datapoint in the Linearizer screens Perform Cal linearity function in the Linearizer screens Perform Calculate Result procedure in Initial cal screens Figure 44 Calibration with non linear table linearizer flow chart Note The procedures for performing the two point calibration are found in the Calibration chapter beginning on page 45 DSGH Technical Reference Manual 143 Using a Linearizer Table Collecting linearizer look up table data In density applications the recommended linearizer is the equation The equation calculates the shape of the curve between the low and high calibration endpoints However you can collect data points between the high and the low calibration points so that the DSGH calculates a curve based on your samples Before collecting the linearizer table data _ oon oa pr aO DN w Have the samples of known density ready to measure xw Have actual density or percent solids value for these samples from the lab ready to enter Procedure 60 To collect linearizer table data From the Main menu select Calibrations From the Calibrations menu select Linearizer From the Linearizer menu select Linearizer data From the Linearizer data menu select Linear data coll From Linear data coll menu select Collect datapoint At the prompt enter the actu
121. t select Yes to take data e This forces the CPU board to perform a data collect on the auxiliary input and store the counts for the low level analog input signal e Select Yes to accept the counts and press F4 to enter 8 From the Analog in Cal menu select Aux High Input Cal e Atthe prompt select Yes to take data e This forces the CPU board to perform a data collect on the auxiliary input and store the counts for the high level analog input signal e Select Yes to accept the counts and press F4 to enter 9 Press F2 to save The output of the Analog Input Circuit board is dependent on the input signal The table below shows typical output frequencies based on the applied input signal Table 30 Output frequencies based on applied input signal Input Signal Selected Range Frequency Output 4mA 0 20mA 6 000 Hz 20 mA 0 20mA 30 000 Hz 5V 0 10V 15 000 Hz 2 5V 0 25V 3 000 Hz 120 DSGH Technical Reference Manual Special Applications Material present absent detector or point level detector with quick relay response You can use the DSGH as a switch to indicate the presence or absence of material and trigger the relay Applications of this include the following e Detecting a slab of steel at the furnace discharge e Counting product on a conveyor e Area safety monitor e Point level switch on a tank This feature requires special firmware Contact you VEGA representative for further informat
122. t Initial setup 2 From the Initial setup menu select Alarms 3 From the Alarms menu choose Sel relay function 4 From the Sel relay function menu select Diagnstic and press F4 to enter 5 If using a hand held HART Communicator press F2 to send the setting to the transmitter DSGH Technical Reference Manual 95 Initial Factory Setup Analog alarm setup The analog alarm uses the current loop analog output to signify that the sensor is outputting zero counts In this case the analog output sets to either 2mA or 22mA and no longer tracks the process variable The user can choose the 2mA or the 22mA setting for the analog alarm Table 16 Analog alarm conditions Alarm out 22 mA Alarm out 2 mA Setting the analog alarm output Procedure 48 Setting the analog alarm output 1 From the Main menu select Initial setup 2 From the Initial setup menu select Alarms 3 From the Alarms menu select Mode configuration 4 From the Mode configuration menu select Analog alarm 5 From the Analog alarm menu select Alarm output 6 From the Alarm output menu select either 22 mA or 2 mA 7 Press F4 to enter 8 If using a hand held HART communicator press F2 to send the change to the transmitter Process alarm setup Use the process alarm setup to make the relay output a high or low process alarm For a low limit a process measurement below a set point energizes the relay for a high limit a process measurement above a set p
123. tage status diagnostics check 73 serial numbers 65 setting the auxiliary input filter 108 shutter check alarm setup 101 frequency 81 recording when complete 81 setting the interval 99 Shutter check due alarm acknowledge 73 diagnostics check 73 in diagnostic history 75 Shutter check interval 99 slurries 141 solutions 141 Source decay gain displayed in process chain 58 source holder lock 36 Source type 98 source wipe alarm setup 101 frequency 81 recording when complete 81 setting the interval 99 source wipe due alarm acknowledge 73 diagnostics check 73 in diagnostic history 75 span current loop analog output 95 current loop View PV unit 96 process 94 setup 94 spare parts 82 specifications 17 heater kit changes 109 standardization 51 on absorber plates 53 on process 52 on water 52 standardize due alarm acknowledge 73 alarm setup 101 diagnostics check 73 in diagnostic history 75 standardize gain 51 Standardize gain displayed in process chain 58 Standardize interval 90 Status Error 61 Stdz standardize counts 56 storage 15 System parameters 96 T Table linearizer 44 45 Tag 99 TC temperature compensated counts 56 Temp sensor temperature 56 Temp comp gain 58 149 Index temperature coefficients 65 66 temperature compensation algorithm 116 Temperature test mode 64 temperature units 114 temperature compensated density
124. terval DSGH Technical Reference Manual Calibration Choosing a standardization method You can perform a standardization using any of the following e Process e Water or other repeatable fluid e Absorber plates e During the standardization procedure the system displays one of the following e Default value for the standardization material e Prompt to enter the actual value of the standardization material See Appendix Initial Factory Setup for details on how to set up the software for either prompt The choice of the standardization method depends on several factors This section includes an explanation of the advantages and disadvantages for each method Standardization on water Standardization on water may be the best choice if water is readily obtainable For example if the process is water based or if the process is slurry with water as the carrier Advantages If the source of water is of consistent purity for example city vs pond standardization on water is highly accurate Water is an especially good choice if the density of the process is around 1 0SpG because standardization on water would be within the process span This ensures high accuracy at that point on the calibration curve Disadvantages You must be able to empty and fill the process pipe with a consistent source of water Procedure 7 Standardization on water ale From the Main menu select Initial setup Process parameters Cal parameter
125. th the Span settings current loop span appropriate values in degrees API units Page 82 88 45 46 88 138 DSGH Technical Reference Manual Special Units Indication Degrees Twaddle indication The DSGH can be set up to indicate degrees Twaddle by choosing degTwad in the Process units screen from the Initial setup Process parameters menus Degrees Twaddle is a specific gravity scale for liquids between 1 0 SpG and 2 0 SpG that divides the specific gravity scale in that range into 200 equal parts Each degree Twaddle equals a difference in specific gravity of 0 005 For example 40 Twaddle is equivalent to 1 200 SpG Note If the product is outside the range defined for degrees Twaddle 0 200 Twaddle or 1 000 2 000 SpG the output of the DSGH locks on the last valid reading either O Twaddle or 200 Twaddle The DSGH directly measures only the total mass in the volume between the detector and source holder This is equivalent to a direct measurement of density mass volume since the volume remains constant When the DSGH indicates degrees Twaddle it is indicating a derived quantity The DSGH calculates the Degrees Twaddle with the following equation valid only when 1 000 SpG lt Der lt 2 000 SpG SpG 1 000 0 005 When the DSGH is indicating degrees Twaddle the following equation calculates the specific gravity degTwad SpG degTwadx0 005 1 000 145 SpG _ gt _ P 145 0
126. the electronics package in place Carefully pull the electronics package out of the housing Remove the appropriate board from the clamshell assembly by removing the three 3 mounting nuts Note If you are changing the CPU board you must move the old firmware chip to the new board if the new board firmware is different Carefully reconnect any ribbon cables Install the electronics package in the housing Replace the three 3 mounting nuts Reconnect the terminal wiring connector Install the plastic electronics cover Install the housing cover Turn on the power to the unit DSGH Technical Reference Manual 79 Diagnostics and Repair Note If you change the CPU board a New Hardware Found error message normally appears when you connect with the HART communicator In Ohmview2000 click Diagnostics New hardware New CPU and click OK for a new backup of EEPROMS Mounting Nuts Requesting field service To request field service within the U S and Canada call 513 272 0131 from 8 00 A M to 5 00 P M Monday through Friday For emergency service after hours call 513 272 0131 and follow the voice mail instructions Returning equipment for repair to VEGA When calling VEGA to arrange repair service be ready with the following information Product model that is being returned for repair Description of the problem VEGA Customer Order C O Number Purchase order number for the repair service
127. the gauge type 64 To select the gauge location 64 Checking and acknowledging diagnostic alarms 68 To record a source wipe or shutter check 78 To check the due date of the source wipe or shutter check 78 To replace the CPU or power supply board 79 Returning equipment for repair 81 Setting the process units for density 83 Setting custom units 83 Setting the calibration parameters 85 Selecting a filter type damping and fast cutoff 87 Preface Procedure 37 Procedure 38 Procedure 39 Procedure 40 Procedure 41 Procedure 42 Procedure 43 Procedure 44 Procedure 45 Procedure 46 Procedure 47 Procedure 48 Procedure 49 Procedure 50 Procedure 51 Procedure 52 Procedure 53 Procedure 54 Procedure 55 Procedure 56 Procedure 57 Procedure 58 Procedure 59 Procedure 60 Procedure 61 Procedure 62 10 Setting the process span 88 Setting the current loop span 89 Viewing the PV unit 89 Setting the time and date 90 Setting the linear units 90 Setting vessel diameter measurement 91 Setting the source type 91 Setting the tag identifier 92 Setting the system information message 93 Setting the descriptor 93 Setting the relay as a diagnostic alarm 95 Setting the diagnostic alarm conditions 95 Setting the analog alarm output 96 Setting up the process alarm 97 To set the x ray alarm parameters 99 To set the relay as an x ray alarm 99 Setting the input filter 100 Setting up temperature compensation 108
128. the installation of the heater the maximum power consumption increases to 25watts The unit is either 115VAC 10 220VAC 10 instead of the standard 90 270VAC range or 24VDC DSGH Technical Reference Manual 102 Special Applications Process temperature compensated density You will need a temperature probe and a DSGH with an analog input board to adjust the density indication to reflect the process density at a reference temperature The temperature probe measures the process temperature sends an analog signal to the DSGH and then the DSGH sends a4 20 mA output signal with calibration and temperature compensation for control and HART communication Hand held terminal Control system femp 4 20mA HART modem Probe Current loop Computer Figure 26 Temperature compensation system DSGH Technical Reference Manual 103 Special Applications Installation requirements Use of an RTD temperature probe requires an VEGA analog input circuit board p n 243409 The analog input circuit board mounts to the top of the unit with mounting a bracket p n 243563 The analog input kit s part number is 243585 Interconnect for RTD temperature probe Use the J1 4 pin connector to wire the analog circuit board to the RTD Table 20 Analog circuit board to RTD pin and connections J1 pin RTD connection 1 Signal 2 Signal 3 RTD 4 RTD The analog input circ
129. the values for the process span Min or Max densities change Modify the span setting if the DSGH moves from its intended location or is measuring on a different span It is a good practice to verify that the setting is correct before performing a calibration Setting process span Procedure 36 Setting the process span Ts From the Main menu select Initial setup 2 From the Initial setup menu select Process parameters 3 From the Process parameters menu select Spans 4 From the Spans menu select Process span 5 From the Process span screen set both the minimum and maximum values for the measurement span 6 Press F2 to send the setting to the transmitter Current loop span The current loop span is the lowest and highest density to be indicated by the 4 20 mA current loop analog output These settings do not have to be the same as the process span settings Min density and Max density but must be within the boundaries set for the process span The screens prompt entry of a 4 mA Density and a 20 mA Density The current loop output can be set to be either forward or reverse acting by choosing the appropriate values of 4 mA Density and 20 mA Density A forward acting output is 88 DSGH Technical Reference Manual Initial Factory Setup proportional to the density and a reverse acting output is inversely proportional to the density See the table that follows for an example of settings for process values of 0 5 an
130. tor Model 275 In addition VEGA View enables the following e Charts the 4 20 mA current output graphically e Stores and retrieves configuration data to disk e Off line editing of configurations Figure 6 VEGA View software Note There are some minor differences in operation of the VEGA View software and the hand held communicator Most significantly VEGA View software writes entries immediately to the density transmitter but a communicator only sends changes after pressing F2 to send This manual s instructions are for the hand held communicator but most procedures use exactly the same steps Refer to the VEGA View User Manual that accompanies the software diskette for complete instructions for using VEGA View software DSGH Technical Reference Manual 23 Introduction Using Ohmview 2000 Software on a PC When you use an IBM compatible personal computer with windows and a Pentium processor to communicate with the DSGH or other VEGA HART transmitter field devices you must have a HART modem and Ohmview 2000 software The Ohmview 2000 software kit part number 243008 includes the following e Modem e Cables e Software Ohmview 2000 RS 485 Network Ohmview 2000 Logger and Ohmview 2000 Configuration software is a window s program that emulates the HART Communicator Model 275 In addition Ohmview 2000 enables the following e Charts the 4 20 mA current output graphically e Stores and retrieve
131. ts Advanced Functions The temperature coefficients are used in an algorithm that compensates for variations in measurement output with changes in temperature The VEGA factory determines the coefficients through rigorous testing You cannot change these values through normal operation Checking the sensor voltage poll address version and serial numbers Procedure 24 To check the equipment version and serial numbers 1 From the Main menu select Advanced Fxns 2 From the Advanced Fxns screen select Other advanced 3 From the Other advanced screen select one of the following Sensor voltage Poll addr Firmware ver Hardware ver CPU Serial No Sensor Serial No View Temp coefs DSGH Technical Reference Manual 63 Advanced Functions Select gauge type VEGA s nuclear density gauges use much of the hardware and software of the DSGH If your DSGH indicates density as the process variable it was set incorrectly for a density type application Select gage type enables the users to set the software to operate as either a density or a level gauge Procedure 25 To select the gauge type 1 From the Main menu select Advanced Fxns 2 From the Advanced Fxns menu choose Select gage type 3 From the Select gage type menu select Density 4 If using a HART hand held communication device press F2 to send Select gauge location The local gauge refers to a gauge that has its sensor electronics and processing electronics
132. uit board interfaces with the power supply board through the 14 pin connector Table 21 Analog circuit board to GEN2000 power supply board pin and connections P1 pin Analog Input Board 8 6V 9 GND 11 Freq 12 Freq We recommend using shielded 18AWG or 20 AWG cable for the input signal The maximum length for an externally generated voltage signal depends on the signal loss in the cable To compensate for signal loss associated with wire length use a 4 wire connection Figure 27 and Figure 28 illustrate the DSGH power supply analog input board and RTD wiring and jumper connections 104 DSGH Technical Reference Manual Special Applications Jeulw4a pyay puey jeuoljd sod indul yw wapow jeuondo aanyoapYyoe way sAs Wood j01 U02 eTa TT cfs susdun yeu SUOHIPUUO GLY AIM E Zf uo payeysuy ssadwnf ou SUOHISUUO GLY aIM p puno 3 5373N3 gt punoi3 Zursno D E es ta 4aMOd SaPOd je20 4ad ajqe gt samog parog Ajddns 4emod 0007N3D pavoq andu Sojeuy UO eI0 JOSUSS apaau S8p su oh isisio Figure 27 RTD input interfaces with circuit board 105 DSGH Technical Reference Manual Special Applications Cut off thermostat optional RTD Analog Input board mounting bracket To a 4 wire GEN2000 ROLA power supply board RTD Analog q input board l RED Buk va GRN ees RTD Analog input boa
133. ument with LED indicators on the CPU board They are visible when you remove the explosion proof housing pipe cap See the Tables on page 76 for a summary of the LED indications Figure 22 illustrates the LED indicators Bon gt og p amp H gt o gt 2 amp 5 2 a Z Blinking OOOO OmgoOoOoOn Off Normal LED pattern Memory corrupt pattern Oe E O n Figure 22 LED indicators FLASH corrupt LED pattern The FLASH chip stores the device description DD software The transmitter does not operate if the FLASH chip is corrupt A HART device that connects to the transmitter displays the message No Device Found In this situation the LED bank displays a distinctive pattern shown in Figure 22 Call VEGA Field service to report this condition DSGH Technical Reference Manual 75 Diagnostics and Repair LED 6V 24V Relay Table 11 Power supply board LED summary Power Supply Board LED summary table Description 6V DC voltage level to electronics Analog output loop voltage Relay condition indicator Normal Error condition condition ON OFF electronics are not receiving 6V DC voltage required for functioning ON OFF 24V not present on 4 20 mA output 4 20 mA output and HART communications are bad ON when relay is None energized OFF when relay is de energized Recommendation Verify 6V on test points Check fuse on Power Supply board C
134. ure 19 To exit the Auxiliary test mode 1 From the Advanced Fxns menu select Test mode Aux Inp test mode Exit Aux test mode 2 At the prompt select Yes to exit the test mode Relay test mode Relay test mode enables the user to manually toggle the relay on or off to test the contacts This is useful for verifying the functioning of alarm annunciators To start relay test mode Procedure 20 To start the Relay test mode 1 From the Main menu select Advanced Fxns Test mode Relay test mode Energize relay or De energize relay 2 The transmitter continues functioning in Relay test mode until it times out after one hour or until you choose Exit relay test To exit relay test mode Procedure 21 To exit the Relay test mode 1 From the Advanced Fxns menu select Test mode Relay test mode 2 From the Relay test mode menu select Exit relay test Temperature test mode The temperature test mode allows the user to manually force the sensor temperature probe output to a specified value This is useful for verifying the scintillator sensor temperature compensation Start temperature test mode Procedure 22 To start the Temperature test mode 1 From the Main menu select Advanced Fxns DSGH Technical Reference Manual 61 Advanced Functions m2 a k oO DN 2 3 4 From the Advanced Fxns menu select Test mode From the Test mode menu select Temperature test mode From the Temperature test mode menu select Enter Temp test
135. ure compensation parameters and descriptions 107 Platinum 100 RTD temperature to frequency output 111 Flow meter pin and connections 113 J2 Jumper block configuration 114 Flow rate unit to mass flow unit 118 Flow unit options 119 Mass flow unit output options 119 Output frequencies based on applied input signal 120 Initial settings and calibration percent solid or solution 137 Reference table for Initial Setup and calibration degrees API 138 Reference table for Initial Setup and calibration requirements degrees Twaddle 139 Reference table for Initial Setup and calibration requirements degrees Baume 140 DSGH Technical Reference Manual Preface Figures Figure 1 IECex Label 16 Figure 2 System overview 19 Figure 3 Typical source holder 20 Figure 4 DSGH exploded view 20 Figure 5 HART hand held communicator 22 Figure 6 VEGA View software 23 Figure 7 Ohmview 2000 software 24 Figure 8 Example of an Ohmview 2000 CD label 25 Figure 9 Bench test setup 27 Figure 10 Mounting the detector 30 Figure 11 Internal and external ground screw 31 Figure 12 DSG Perforated View 32 Figure 13 Typical interconnect 32 Figure 14 Terminal connections 33 Figure 15 Measuring the current loop output 39 Figure 16 H1 and H2 test points 40 Figure 17 Density two point calibration flow chart 42 Figure 18 Percent counts range vs percent process span 54 Figure 19 X ray interference alarm output 71 Figure 20 Circuit board
136. y periodic standardization to compensate for drifts over time However certain events necessitate a new calibration The events are Measurement of a new process application contact VEGA for recommendation Process requires a new measurement span Entry of anew measurement span setting into the software Installation of a new radiation source holder with the DSGH Moving the DSGH to another location Note In the U S only persons with a specific license can relocate the gauge excluding a low activity gauge such as the SHGL Changes to pipe size schedule or any other change in process piping Excessive build up or erosion of pipe that standardization cannot compensate for check standardize gain Standardize gain is greater than 1 2 after a standardization indicating it made a 20 adjustment from the calibration Periodic process standardization Standardization adjusts the system by resetting one point of the calibration curve to an independently measured or known sample The frequency of standardization depends on several factors including desired accuracy of the reading Automatic standardization reminder If you enable the standardization due alarm the DSGH alarms when standardization is due The standardize interval is programmed into the calibration parameters setup Refer to Appendix l Initial Factory Setup for details on the following subjects 48 Output relay setup Standardization due alarm Standardization in

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