Home

Xentra 4900 Continuous Emissions Analyser Installation and

1. HOUR 00 ENTER START TIME As per period entry above MINUTE 00 TIME 12 00 00 Temporary display of start time and date This DATE 10 12 95 must be later than the current time and date SET UP CAL PARM t Y ENTER to perform an auto cal or check ONE CYCLE t MEASURE to return to measurement displa Note i The autocalibration parameters can be changed without changing the autocalibration timing already installed by pressing the Quit key at the beginning of the start date entry section 4 10 Initiating auto calibration or auto check from keypad An auto calibration or auto check may be initiated from the keypad by following the procedure in Table 4 8 Table 4 8 Initiating auto cal or check from keypad t MENU to obtain top level menu CALIBRATE SETUP r ENTER ALARMS FAULTS MANUAL CAL r Y ENTER AUTOCAL ENTER PASSWORD To change the value of a digit 4 or Y 0000 To change to another digit lt or gt When the value shown is correct ENTER SET UP CAL PARM pe Y ENTER ONE CYCLE 4 11 Initiating auto calibration or auto check by external contact closure An auto calibration or auto check may be initiated by closing a switch between PL5 11 and PL5 12 The switch must be closed for at least 2 seconds to guarantee operation and opened before the calibration is complete 4 14 4 12 Aborting an auto calibration in progress Aborting an autocalibration is accomplished by pressing any key during the autocal
2. 4 11 Allocation of relays isc fee al a elt ae et ee ee 5 3 Format of serial output data frame 2000eeeees 5 15 User interface menu Map 2000 e eee eee ee eee eee A 1 vil TABLE Table 1 1 Table 2 1 Table 2 2 Table 2 3 Table 2 4 Table 2 5 Table 2 6 Table 2 7 Table 2 8 Table 2 9 Table 2 10 Table 2 11 Table 3 1 Table 3 2 Table 4 1 Table 4 2 Table 4 3 Table 4 4 Table 4 5 Table 4 6 Table 4 7 Table 4 8 Table 4 9 Table 4 10 Table 5 1 Table 5 2 Table 5 3 Table 5 4 Table 5 5 Table 5 6 Table 5 7 Table 5 8 Table 5 9 Table 5 10 Table 5 11 Table 5 12 Table 5 13 Table 5 14 Table 6 1 Table 6 2 Table 6 3 Table 6 4 Table 6 5 Table 6 6 viii LIST OF TABLES Transducer FSD values Rack mount installation kit parts list e e 2 5 Loose socket partS c nent eee eeeeee 2 12 Signal terminal location PL1 to PL4 2 13 Signal terminal location PL5 ss x e x e e 2 14 Serial output connections PL6 xx s x x e e e e e 2 14 External autocalibration connections 0000005 2 15 External autocalibration truth table 20000eees 2 15 Sample POMS x e e x x x e K ee 2 16 Sample gas conditions xs x x x x x x x e e e eee eee 2 20 Recommended calibration gases 00eeeeeeeeees 2 22 Recommended component concentrations 2 22 Changing the passwords ss s x x x x x x x x x x e e 3 1 Setting time
3. 11 HIGH TARGET Change the number to the CO 50 8 vpm concentration of the target gas in the calibration gas To change the value of a digit ory To change to another digit lt or gt When the value shown is correct ENTER HT50 8 HC49 8 HT is the target concentration IT CO OK Y N HC is the current concentration eg Introduce high cal gas when the current concentration has stabilised it may be accepted ENTER or rejected ENTER HIGH CAL IN PROGRESS Temporary message CAL RESULT The reading following calibration is HT50 8 HC50 8 displayed for 1 minute This completes the calibration to return to the measurement display MEASURE to repeat the calibration QUIT If the gas sensor module is warming up a warning will be given with an option to proceed b If the calibration has changed by more than user set limit a warning will be given with an option to proceed E If the calibration was not successful a temporary message will be displayed eg BAD LOW CAL CAL IGNORED This indicates that the output of the gas sensor module is outside of the expected range for the calibration gas being used In this event check the value of the calibration gases used If the calibration is still not successful call a service engineer 4 6 Manual cal check low and high Both low and high calibration checks should be performed using the same samples as used for calibration adjustment The programm
4. O O O Figure 2 9 Sample gland plate with internal auto calibration Sample Inlet 2 Sample Inlet 1 Q Sample Outlet 1 Sample Outlet 2 Sample inlet pressure not to exceed Spsig 34kPag A Not suitoble for flammable WARNING samples Cal Gas 1 Cal Gas 2 Figure 2 10 Sample gland plate with external auto calibration Single gas stream configuration Gfx sensors Paramagnetic sensor Pm 1156 0 500 ml min Flow alarm optional Os X L 0 5 I min flow meter optional Needle valve optional x Filter optional Internal Autocal manifold optional Figure 2 11 Typical single stream dual Gfx configuration flow meter optional Needle valve optional Figure 2 11 contains a typical flow diagram for single stream configuration analysers Here up to three transducers are connected to a common inlet and outlet port If two Gfx transducers are supplied then these will be connected in series so that the sample 2 17 gas passes through the first transducer then passes into the second transducer The paramagnetic transducer is connected in parallel with the Gfx transducers An orifice restrictor is connected in series with the paramagnetic transducer to limit the sample flow rate through the transducer This restrictor will produ
5. To change the value of a digit 4 or y To change to another digit lt or gt When the number shown is correct e ENTER To select desired gas sensor module or Y then ENTER if only one module is fitted this section will be omitted Change the number to the concentration of oxygen in the calibration gas between 3 and 3 for equivalent oxygen values of gases see appendix D To change the value of a digit 4 or Y To change to another digit lt or gt When the value shown is correct ENTER LT is the target concentration LC is the current concentration eg Introduce low cal gas when the current concentration has stabilised it may be accepted ENTER or rejected ENTER LOW CAL IN Temporary message PROGRESS The reading following calibration is displayed for 1 minute amp QUIT to obtain next menu The low point cal is now complete either t MEASURE to go to measurement display or t ENTER to repeat the low point calibration t ENTER to continue with a high point calibration Change the number to the concentration of oxygen in the calibration gas between 5 and 100 To change the value of a digit 4 or Y To change to another digit lt or gt When the value shown is correct r ENTER 11 Oxygen OK Y N HC is the current concentration eg Introduce high cal gas when the current concentration has stabilised it may be accepted ENTER
6. amp HIGH t ENTER to select low and high 11 CO Change the number to the concentration of the LOW 00000 low gas The unit of measure will be the primary unit for the transducer Any digit position may be used for the decimal point To change the value of a digit 4 or Y To change to another digit lt or gt When the value shown is correct ENTER 11 CO As per low conc entry above This display will HIGH 00000 only appear if LOW amp HIGH has been selected 11 CO This selects the calibration gas bottle to be used IS LOW CAL1 Y N for low calibration t ENTER If CAL1 is low cal gas t C ENTER If CAL2 is low cal gas The previous 3 steps will be repeated for each transducer fitted SELECT MODE To select cal ENTER AUTO CAL CHK To select check ENTER SET DV LAG t or Y to obtain the required time for flushing 0 5 Min 1 of sample system with calibration gas 8 minutes max ENTER PERIOD Change the number as required DAYS 00 To change the value of a digit 4 or Y To change to another digit lt or gt When the value shown is correct ENTER ENTER PERIOD As per period entry above HOURS 00 TIME 12 07 16 Temporary display of current time and date DATE 10 11 95 ENTER START TIME As per period entry above YEAR 0000 ENTER START TIME As per period entry above MONTH 00 ENTER START TIME As per period entry above DAY 00 4 13 ENTER START TIME As per period entry above
7. or mg per normal cubic meter For paramagnetic oxygen transducers the displayed unit is fixed as volume percent The user defined message UDM field represents the component name of the process variable The xentra display may be returned to measurement display at any time by pressing the MEASURE key see figure 1 4 If no user key presses are input then the Xentra returns to the measurement display after a one minute time out This time out is extended to 20 minutes during the calibration options When first powered up the display will show a sequence of power up messages before returning to the measurement display see section 2 12 If the user does not wish to see the power up messages then these can be disabled by pressing the measure key during the SYSTEM OK message The warming up icon see figure 1 5 will also be displayed until all gas sensor modules are at their respective operating temperature This may take up to 1 hour Icons located at the bottom centre of the measurement display indicate the status of the instrument see figure 1 5 These icons show that the instrument is warming up or being calibrated using the autocalibrate facility Icons at the bottom of the display also indicate the presence of alarms or faults If the fault or alarm icons appear on the measurement display the exact nature of the fault or alarm may be determined via the user interface see 6 2 Displaying alarms present and 6 3 Displ
8. point To change the value of a digit 4 or Y To change to another digit lt or gt When the value shown is correct r ENTER LOW amp HIGH TOL t MEASURE to return to measurement display The tolerance must not be greater than 10 FSD if an illegal figure is entered a prompt to enter a new number will be given 4 4 Paramagnetic transducer low and high manual calibration The low calibration gas for paramagnetic gas sensor modules may be specified between 3 and 3 oxygen This is to allow for the situation where the background gas affects the paramagnetic zero Appendix D Zero grade nitrogen is recommended for low calibration See Section 2 11 for further discussion of recommended calibration gases The high calibration gas can be in the range 5 to 100 oxygen For the Pm1156 transducer a high calibration gas with approximately 21 oxygen is recommended Care should be taken when measuring gases with an oxygen content greater than the high calibration gas The procedure for performing a paramagnetic low and high manual calibration is given in table 4 3 4 3 4 4 AUTOCAL ENTER PASSWORD 0000 CALIBRATE 11 Oxygen T LOW CAL HIGH CAL HISTORY CHK L amp H 11 LOW TARGET Oxygen 000 00 LT00 00 LC00 04 11 Oxygen OK Y N CAL RESULT LT 00 00 LC 00 00 LOW CAL HIGH CAL HISTORY CHK L amp H 11 HIGH TARGET OXYGENS 20 95 Table 4 3 Paramagnetic low and high calibration t MENU to obtain top level menu
9. 11 Oxygen AL3 LO To obtain the next screen 1 96 00 ENABL 11 Oxygen AL3 LO To obtain the next screen HYST 0 1 FOL 11 Oxygen ALA HI To obtain the next screen 99 00 DISAB 11 Oxygen AL4 LO This is the last of the eight screens HYST 0 1 FOL t MEASURE surement display 6 4 6 7 Displaying analyser identity The analyser identity display shown during the start up message sequence may be displayed by using the procedure described in Table 6 6 Table 6 6 Displaying analyser identity t MENU to obtain top level menu CALIBRATE SETUP rs gt ENTER ALARMS FAULTS SET ALARM ASSIGN pe Y ENTER DISPLAY UTILITY OUTPUTS ALARMS This operation shows the analyser identity on DIAGNOSTICS ID the following three temporary screens and then returns to this screen i Y gt ENTER xentra 4900 REV 04900 652 0 MODEL4902B1 0302 2100 24101 00011 SERIALNO 1234 ORDER NO 845123 OQUTPUTS ALARMS t MEASURE to return to measurement display DIAGNOSTICS ID t Y K ENTER to view the analyser identity again 6 8 Displaying alarm history An entry is made in the alarm history buffer each time an alarm appears or is cleared The alarm history buffer contains the most recent 20 events The information is displayed in the following format gas sensor module site number measurement name alarm level alarm sense eg I2 O2 AL2 98 00 LOW The alarm shown is AL2 on the Oxygen gas sensor in site 2 a low alarm with an alar
10. B of this manual 1 2 Start up and commissioning of the xentra should be performed in the order presented in this manual Installation section 2 This section takes commissioning to the point where the xentra is powered and operational The installer is advised to read this section completely before commencing installation Initial configuration section 3 This section serves as a tutorial for the user interface and ensures that the password and clock are set before calibration Setting the clock ensures that calibration activity is correctly recorded in the calibration history file Calibration section 4 This section describes manual calibration automatic calibration manual calibration check and automatic calibration check Main configuration section 5 This section describes setting up of alarm levels analogue outputs relays and other parameters Review section 6 This section describes how to display analogue output settings relay allocation alarms faults and analyser identity without changing the analyser settings 1 3 1 4 Location of components Figure 1 1 identifies the location of the key features of the xentra 4900 Continuous Emissions Analyser FRONT VIEW FLOWMETER S SAMPLE FILTER Ui Servomex L DISPLAY L KEY L NEEDLE VALVE S DISPLAY VIEWING RACK MOUNTING BRACKETS ANGLE ADJUST REAR VIEW ls MAINS CONNECTOR SAMPLE
11. ENTRY ANALOGUE OUTPUT CABLING S TO MOUNT ENDBLOCKS 2 SLIDE END BLOCKS ON TO DOVE TAILS ON END OF SCREW TERMINAL BLOCK 1 Figure 2 7 Signal socket assembly Table 2 2 Loose socket parts Description Screw terminal block 2 End block 4 Cover Cable tie N a k 2 12 Table 2 3 Signal terminal location PL1 to PL4 Terminal PL4 PL3 PL2 PL1 number optional optional optional 14 screen screen screen screen 4 p Not used Not used Not used Relay 1 5 c B 0 V Relay 4 4 Relay 3 4 Relay 2 4 Relay 1 4 e 11 A A r 10 B B 7 screen screen screen screen 6 screen screen screen screen 2 OQ c t o 0 3 S 2 screen screen screen screen Fitted if option card type is Dual relay and dual mA output A A B B Relay 4 3 Relay 3 3 Relay 2 3 Relay 1 3 A A A A B B B B D e 00 Table 2 4 Signal terminal location PL5 2 7 Serial output connection The serial data output is provided via the 9 pin D type connector located on the rear of the instrument PL6 conforming to the EIA RS 232C interface specification The connections for the RS232 output are shown in table 2 5 For compliance with EMC standards connections to PL6 must be made using a screened cable not exceeding 3 metres in length The screen is terminated at the EMI shielded backshell or conductive cover of the D type connector For unidirection
12. HT20 95 HC20 74 HT is the target concentration or rejected ENTER HIGH CAL IN Temporary message PROGRESS CAL RESULT The reading following calibration is displayed HT20 95 HC20 95 for 1 minute This completes the calibration to return to the measurement display MEASURE to repeat the calibration r QUIT E If the gas sensor module is warming up a warning will be given with an option to proceed i If the calibration has changed by more than user set limit a warning will be given with an option to proceed E If the calibration was not successful a temporary message will be displayed eg BAD LOW CAL CAL IGNORED This indicates that the output of the gas sensor module is outside of the expected range for the calibration gas being used In this event check the value of the calibration gases used If the calibration is still not successful call a service engineer 4 5 Gfx gas transducer low and high manual calibration The low calibration gas for Gfx gas sensor modules may be specified between 5vpm and 5vpm of the measured component Zero grade nitrogen is recommended for low calibration The high calibration gas can be in the range 6 to 110 of the transducer s FSD Table 2 11 gives the recommended calibration levels to be used to calibrate the transducers The procedure for performing a Gfx low and high manual calibration is given in table 4 4 The tables use the CO transducer as an example The measured componen
13. INLET S _ FANIFILTER Se EMC GROUND K SIGNAL TERMINALS FUNCTIONAL GROUND SERIAL OUTPUT PORT SIDE VIEW X IDENTIFICATION LABEL SERIAL NUMBER LABEL Figure 1 1 Key features of Xentra 1 5 _ Introduction to the xentra user interface The xentra user interface consists of a keypad with nine keys and a large edge lit LCD display see Figure 1 1 During normal use of the instrument the LCD screen will display either the default measurement display or a menu based screen editor display Toggling between the measurement display and the menu based editor is via the keypad User input to the menu based screen editor is also via the keypad 1 4 1 5 1 The xentra measurement display The measurement display is the default display that is presented to the user of the xentra 4900 The display can be user configured to show the gas concentrations measured by the gas sensor modules fitted and or the external analogue inputs The status of the instrument plus the occurence of an alarm or fault active are also displayed on the measurement display via icons positioned at the bottom of the screen The contents of the measurement display are shown in figure 1 2 Titles aon No Value Unit Component 11 12 6 vpm CO I2 15 75 O02 E1 123 4 mg Dust Process Variables E2 10 3 mA Extern FAULT M essag e Icons Le Figure 1 2 Xentra measurement display Each measure
14. LIMITS or HI CAL OUTSIDE The gas concentration specified in the autocalibration configuration is outside of acceptable limits The results of autocalibration are different from the existing values by more than the specified tolerance limits an the gas Respecify calibration concentration Check that calibration gas is not empty Check that the concentration of the calibration sample corresponds with the LIMITS concentration specified in the autocalibration configuration Perform an ONE CYCLE autocalibration to clear the fault If a successful calibration can not be achieved then call a service engineer Table 8 4 shows a list of the diagnostic signals available for the Gfx1210 transducer Table 8 4 Diagnostic signals for the Gfx 1210 transducer Fault Description Typical level Range DIF SIG Difference signal between 0 000V 0 25 to 1 31 the CO and N filled filters V GAS SIG Signal level for the CO 1 000 V 0 5 to 1 31 V filled filter N2 SIG Signal level for the N 1 000 V 0 5 to 1 31 V filled filter SAMPLE Sample temperature 20 C 0 to 50 C TEMP CHOPPER Chopper box temperature 60 C 50 to 70 C TEMP 8 4 8 4 Fault diagnosis with a non functioning display Table 8 5 describes checks which can be made if the display is blank or not illuminated Table 8 5 Fault finding with non functioning display Symptoms Possible causes Recommended action DIM DISPLAY Impr
15. a 20mm fuse is used then ensure that the fuse does not extend into the spring clips provided for a 1 inch fuse see Figure 2 6 Replace the voltage selector and mains connector SPRING CLIPS FOR 20 mm FUSE SPRING CLIP FOR 1 INCH FUSE 20 mm FUSE Figure 2 6 Fuse holder spring clips If a loose IEC socket has been supplied this must be wired in accordance with national and local regulations The flexible power cord used should be rated as follows Current 6A Voltage According to voltage setting The analyser should be connected to a clean single phase electrical power supply meeting the requirements of Installation category II IEC 664 see page 2 1 at a voltage within the range selected The electrical power supply should be fused at a value to protect the power cord It is recommended that the electrical power supply is fused at 6A For compliance with EMC emissions and susceptibility standards EN 50081 1 1992 and EN 50082 2 the EMC ground must always be connected to a local earth see Figure 1 1 After wiring the power cord check earth continuity from the power connection earth to the EMC ground on the rear of the chassis see Figure 1 1 The user must ensure that when installed in a rack cabinet or other fixture the mains switch is readily accessible or where this is impractical the installation must be provided with a separate means of disconnecting power which complies with the relevant local an
16. and date 200000 22 eee eee 3 2 Recommended calibration periods 2 05 4 2 Setting low and high calibration tolerances 4 3 Paramagnetic low and high calibration 4 4 Gfx sensor low and high calibration 2055 4 6 LOW Gal eheck iirinn RRR RRR KR RR eee a eee oe 4 8 High Cal check se ss ss sr R R R eee renee eet tee KR ees 4 8 Setting up auto calibration and auto check 4 13 Initiating auto cal or check from keypad 00055 4 14 Aborting auto cal or auto check 00 eee eee 4 15 External analogue input scaling 0000eeeee 4 16 Setting up alarmS xx x x x x x x x x x x e 0c eee 5 2 Allocation of relays s ss s s s s s sese eee 5 4 Clearing of relay assignment 000e ee K ee 5 5 Analogue output span limits 0 e e eee eee eee 5 6 Setting up analogue outputs x x lt lt lt lt lt lt lt eee eee eee 5 7 Clearing an analogue output assignment 5 8 Component name definition sss s s s lt x lt lt lt lt e e e e eee eee 5 9 External analogue input definition 200ee00es 5 10 Defining and selecting measurement displays 5 11 Setting response time and resolution 5 12 Setting the NO conversion parameters 5 5 14 Serial communications parameters 200 0020005 5 15 Setting the serial outp
17. avoid damage to the measuring sensors 7 2 SECTION 8 FAULT DIAGNOSIS 8 1 Introduction This section describes the faults which may be indicated for each type of gas sensor module and the chassis as well as the diagnostic signals which may be accessed through the user interface See Review section 6 for directions on accessing fault and diagnostic information When requesting technical assistance from Servomex you should advise the following e A list of which faults are present o A list of the corresponding diagnostic signal levels 6 The analyser serial number Guidance on locating and rectifying problems is given where appropriate For instructions on displaying the current fault status then see section 6 3 For instructions on displaying the diagnostic signals then see section 6 11 8 2 Fault diagnosis on the Pm1156 transducer Table 8 1 shows a list of the indicated fault conditions for the 1156 paramagnetic transducer Table 8 1 Fault diagnosis on the Pm1156 transducer Fault indicated Possible causes Recommended action CELL VOLTS HIGH Faulty component Call service engineer CELL VOLTS LOW Faulty component Call service engineer CELL TEMP HIGH Ambient temperature Check ambient too high or faulty operating temperature component is lt 40 or call service engineer SAMPLE FLOW LOW Sample flow recorded Check sample inlet by optional flow pressure and flow rate monitor is too low Check for blocked
18. internal autocalibration manifold is only used with the single gas stream configuration When the external autocalibration option is used then an interface PCB and connector PL 8 are mounted on the sample gland plate See Figure 2 10 This provides ports for up to two sample inlets and a corresponding outlet for each inlet The electrical connector provides for two sets of voltage free relay contacts that may be used to operate external sample valves Connection details for the external electrical contacts are given in section 2 8 The external autocalibration option is available for both the single and dual sample stream configurations Sample gas connections are shown in Table 2 8 Table 2 8 Sample ports Cal Gas Cal Gas 1 2 L Standard Vg NPT LAT NPT N A N A female female With internal Auto Ve NPT LAT NPT Ve NPT VY NPT Calibration female female female female 2 15 2 16 Sample Inlet 4 Sample Inlet 3 Sample Inlet 2 Inlet 1 f N 7 Sample Outlet 4 f y 7 Sample Outlet 3 f N Sample Outlet 2 N E f X Ka Sample Outlet 1 J WARNING Sample Inlet 4 Sample Inlet 3 Sample Inlet 2 f A WY 7 Sample Outlet 4 A N WY 7 Sample Outlet 3 ZN M Sample Outlet 2 SH A WARNING
19. is displayed if a fault condition is identified within the analyser The cause of the fault may be identified from the user interface see section 6 2 Displaying faults present 1 5 4 The xentra menu display To initiate any user interface menu operation the MENU key should be pressed The xentra will then present the top level menu which in turn leads on to other menus A tree showing the menu structure in its entirety is given in appendix A At each menu the user highlights the desired option using the arrow keys 4 Y lt gt and then presses the ENTER key Reverse video is used to highlight the selected menu option Pressing the MEASURE key at any time returns to the measurement display The EDIT key is used as a short cut key Pressing the EDIT key will give immediate access to the edit functions provided to modify the text on the measurement display This includes the names of measured variables and the measurement units During any user interface operation the fundamental measurements are still being made by the xentra and all relevant outputs alarms and diagnostics remain active 1 9 1 5 5 Numeric data input When numeric data input is required then a field of individual digits will be offered to the user Each of these digits is edited independently using the arrow keys 4 Ya 1 For numeric information each digit position may be changed to i Any number in the range 0 to 9 i A decimal point i
20. measurement may be selected between 0 to 3 digits The transducer display resolution will be factory configured with a relevant number of decimal places See table 5 10 for the procedure for changing the display resolution 5 8 Response time The response time may be increased by adding a LC type time constant which may be set between 0 and 60 seconds The display reading is not effected by the time constant when the unit is in calibration mode See table 5 10 for the procedure for changing the response time 5 9 Display units This option allows the user to select the units that will be used for each measurement display Each transducer type has a primary unit set used for calibration purposes which may be assigned a user defined units description For the Pm1156 transducer this is and for the Gfx 1210 transducers this is vom In addition the Gfx 1210 transducers outputs can alternatively be displayed in units of mg per cubic metre See table 5 10 for the procedure for changing the display units type Table 5 10 Setting response time and resolution t EDIT to obtain window edit menu ENTER PASSWORD To change the value of a digit 4 or Y 0000 To change to another digit lt or gt When the number shown is correct ENTER SELECT SCRN UDEF pe Y gt ENTER DEFINE SCRN VARS SELECT MEASURE To select desired gas sensor module 4 or Y 11 Oxygen T then ENTER if only one module is fitted this section will be omitted
21. most recent 20 occasions when a calibration or check was performed The following data is recorded for each occasion i gas sensor module site number il measurement name iii type of check or calibration Corv Calibration or calibration check Validate MorA Manual or Auto LorH Low or High iv difference between measured and actual concentration current measured value value specified during calibration ie a positive number indicates a positive drift 6 6 The information is displayed in the following format gas sensor module site number measurement name type difference time and date eg 12 Oxygen CML 0 213 01 15 20 28 11 the event recorded is a manual low calibration of the Oxygen sensor in site 2 with a correction of 0 213 at 1 15 on 28 November Table 6 9 Displaying paramagnetic gas sensor calibration history t MENU to obtain top level menu CALIBRATE SETUP ALARMS FAULTS MANUAL CAL AUTO CAL ENTER PASSWORD 0000 CALIBRATE 12 Oxygen T LOW HIGH HISTORY CHK L amp H LOW HIGH r ENTER r ENTER To change to another digit lt or gt When the value shown is correct ENTER To select desired gas sensor module 4 or Y then ENTER if only one module is fitted this section will be omitted rv ENTER t ENTER to view Low cal history To change the value of a digit 4 or Y t ENTER to view High cal history I2OxygenCML0 213 t a or Y to view further e
22. plus a paramagnetic oxygen transducer The Gfx transducer will always be configured in location 11 and the paramagnetic oxygen transducer will always be configured in location 12 For the 4904 analyser then the chassis may accomodate up to three internal transducers This would normally be two Gfx transducers plus a single paramagnetic oxygen sensor The Gfx transducers will always be configured in locations 11 Gfx 1 and 12 Gfx 2 with the paramagnetic oxygen transducer configured in location 12 1 7 Output numbering system The outputs from the xentra have a two digit identification number of the following format Card number Output eg the outputs fitted as standard in card position 1 are 1 1 Analogue output 1 2 Analogue output 1 3 Relay 1 4 Relay 1 5 Relay These identification numbers appear on the rear label to identify the terminals where each output appears and on the display when the outputs are being configured 1 8 Transducer full scale deflection The transducer full scale deflection FSD is the maximum concentration level that may be measured and displayed with the precision and accuracy specified for that transducer This may also be termed the measurement range for the transducer Concentration levels that exceed 120 of the FSD are considered as over range and are indicated by the word OVER on the analyser display There are three set up parameters on the xentra instrument that are expressed in terms of
23. position Enter key The user presses the ENTER key to indicate that the indicated menu selection is to be actioned or to indicate completion of text or numerical input If when inputing text or numerical data the key press is ignored then this is because the data entered is invalid otherwise the data will be saved 1 5 3 The xentra screen icons The space at the bottom of the measurement display is reserved for status icons The screen icons that may be displayed are shown in figure 1 5 AUTO ALARM Ane FAULT Figure 1 5 xentra status Icons The function of these icons is as follows Autocal icon This icon is displayed when an instrument auto calibration is in progress The appearance of the icon will change as the Autocalibration procedure progresses see section 4 9 Alarm icon This icon is displayed if any of the user defined alarm levels are triggered If this icon is displayed then the nature of the alarm may be found from the user interface see section 6 2 Displaying alarms present Warm Up icon This icon is displayed if any of the transducers fitted inside of the xentra are operating at a temperature less than their normal operating temperature band This is normally displayed when the instrument is turned on If any of the transducers fails to achieve its normal temperature operating conditions within a specified time then the warm up icon will be turned off and a fault icon raised Fault icon This icon
24. sample lines filter or vent pipes If all OK then call service engineer CELL TEMP LOW Faulty component Call service engineer HIGH CAL CHK OUTSIDE TOL or LOW CAL CHK OUTSIDE TOL HI CAL CHK OUTSIDE RANGE or LO CAL CHK OUTSIDE RANGE HI CAL RESULT OUTSIDE LIMITS or LO CAL RESULT OUTSIDE LIMITS User set low or high calibration tolerance has been exceeded during auto calibration The gas concentration specified in the autocalibration configuration is outside of acceptable limits The results of an autocalibration are different from the existing values by more than the specified tolerance limits Check that calibration gas is not empty Increase tolerance if necessary Check that the concentration of the calibration sample corresponds with the concentration specified in the autocalibration configuration Perform an ONE CYCLE autocalibration to clear the fault If a successful calibration can not be achieved then call a service engineer Respecify the calibration gas concentration Check that calibration gas is not empty Check that the concentration of the calibration sample corresponds with the concentration specified in the autocalibration configuration Perform an ONE CYCLE autocalibration to clear the fault If a successful calibration can not be achieved then call a service engineer Table 8 2 shows a list of the diagnostic signals available for the paramagne
25. the FSD s Calibration tolerances for the transducers Alarm hysteresis The upper limit of the analogue output The FSD values for the different transducer types that may be fitted inside the xentra 4900 chassis are shown in table 1 1 1 9 Table 1 1 Transducer FSD values FSD Pm 1156 O 100 O Gfx1210 CO Standard sensitivity 3000vpm CO Gfx1210 CO High sensitivity 500vpm CO Gfx 1210 SO Standard sensitivity 2500 vpm SO Gfx 1210 NO High sensitivit 1000 vom NO Technical assistance and spare parts Technical assistance and spare parts are available from Servomex outlets listed on the back cover of this manual or from their local agents See 9 2 Spare parts list SECTION 2 INSTALLATION 2 1 Introduction This section provides all the information required to install the xentra 4900 Continuous Emissions Analyser The installer is advised to read this section completely before commencing installation Installation of the xentra requires the use of standard hand tools only The analyser is configured for either panel mount or 19 rack mount If fitted with rack mount brackets but without slides adequate support for the analyser weight must be provided The analyser must never be carried or supported by the rack mounting brackets The xentra complies with EN 61010 1 1993 which requires that the installation requirements specified for the analyser include the pollution degree and installation category for
26. to any combination of the following i Fault ii Calibration in progress iii Any number of alarms See Table 5 2 for procedure Any existing relay allocation may be edited or cleared See Table 5 3 for relay assignment clearing procedure CALIBRATION PROGRESS FAULT a d CARD 1 oe RELAY 1 3 GAS SENSOR gl RELAY 1 4 MODULE 1 RELAY 1 5 ALARM 1 7 or wy ALARM 2 ALARM 3 ALARM 4 CARD 2 MODULE 2 l _ RELAY 2 4 ALARM 1 Se ALARM 2 ALARM 3 ALARM 4 CARD 3 GAS SENSOR _ _RELAY 3 3 MODULE 3 as RELAY 3 4 ALARM 1 ALARM 2 ALARM 3 ALARM 4 CARD 4 GAS SENSOR RELAY 4 3 MODULE 4 ee RELAY 4 3 ALARM 4 Z RELAY 4 4 ALARM2 9 ALARM 3 ALARM 4 Figure 5 1 Allocation of relays Figure 5 1 illustrates the allocation of relays to analyser conditions Any condition individual alarm fault or calibration in progress may tied to any relay or number of relays ie any number of links may be made between the analyser conditions on the left hand side and the relays on the right hand side 5 3 5 4 Table 5 2 Allocation of relays t MENU to obtain top level menu CALIBRATE SETUP ALARMS FAULTS SET ALARM ASSIGN DISPLAY UTILITY ENTER PASSWORD 0000 RELAYS ANALOGUE SELECT RELAY 1 3 ASSIGNED 1 or 1 3 UNASSIGNED 1 RELAY ASSIGNMENT 1 3 EDIT CLEAR or 1 3 ASSIGN Y N 1 311 O
27. 000 00 mA Extern corresponds to the minimum analogue input Any digit position may be used for the decimal point except the right most digit To change the value of a digit 4 or y To change to another digit lt or gt When the value shown is correct ENTER E1 MAXIMUM 20mA Change the number to the variable value that 000 00 mA Extern corresponds to the maximum analogue input Any digit position may be used for the decimal point except the right most digit To change the value of a digit 4 or y To change to another digit lt or gt When the value shown is correct r ENTER SCALE INPUT To set up the other input QUIT and select MANUAL CAL from the menu 4 16 SECTION 5 MAIN CONFIGURATION 5 1 Alarms The xentra has four user configurable concentration software alarm settings for each gas sensor module fitted These are referred to as AL1 AL2 AL3 and AL4 Each alarm may be enabled or disabled On first power up of the instrument the default state of the alarms is that they are disabled For each alarm of each gas sensor module which is enabled the following parameters need to be set up i Freeze alarm state during calibration or alarm as dictated by calibration sample concentration ii High concentration alarm or low concentration alarm iii The concentration level at which the alarm is to occur alarm level iv Hysteresis see below See Table 5 1 for procedure The alarm hysteresis is used to
28. 11 Oxygen The time constant may be set between 0 and 60 TIME CONST 00 seconds The displayed reading and analogue output are both affected To change a digit 4 or Y To change to another digit lt or gt When the number is correct ENTER 11 Oxygen t a or Y to select the physical units for the DISPLAY IN displayed value then ENTER SELECT SCRN UDEF t Y ENTER to set response time and resolution DEFINE SCRN VARS on another gas sensor module 5 12 5 10 Calculation of total nitrogen oxides NO concentration For analysers fitted with the Gfx 1210 transducer option for measuring nitric oxide NO the facility exists within the analyser software to calculate an estimate of the total nitrogen oxides NOx level based on the measured NO level This estimate of total NOx concentration can also be displayed and output as a separate measurement in the normal way The total NOx estimate is derived from the measured NO concentration according to the formula NOx a NO b NOF where a a linear term b a quadratic term The use of both linear and quadratic coefficients provides the opportunity to accommodate a non linear relationship between NO concentration and estimated NOx measurement In most simple combustion processes it is generally recognised that the NO concentration accounts for approximately 95 of the total NOx In this case the total NOx content can be estimated from the NO measuremen
29. 20 vpm Table 2 11 Recommended component concentrations Gas Measured Recommended calibration level Paramagnetic O 21 Gfx High sensitivity CO 0 50 to 0 500 vpm 50 vpm Gfx Standard sensitivity CO 0 200 to 0 3000 vpm 200 vpm Gfx NO 0 100 to 0 500 vpm 100 vpm Gfx High sensitivity SO 0 100 to 0 500 vpm 100 vom Gfx Standard sensitivity SO 500 vom The accuracy of the calibration materials used with the analyser is an important contribution to the quality of the data measured Servomex recommend that the xentra 4900 Continuous Emissions Analyser be calibrated using certified gravimetric gas mixtures from a reputable supplier These should be accompanied by a compositional analysis certificate of certified accuracy Pressure regulators used with the calibration gas mixtures should be good quality two stage regulators compatible with the gas composition The calibration gas supply pressure will be in the range 1 5 psig The pressure regulators should provide a stable delivery pressure of 0 10 psig 0 1 bar at a standard flow rate of up to 2I minute WARNING The sample and calibration gases supplied to the instrument may be toxic Verify that connections are leak free at full operating pressure before proceeding to admit toxic gases 2 21 2 12 Reading flowmeters The optional flow monitors are provided to control and measure the flow of sample gas through the analyser The flow monitor consists of a n
30. An orifice restrictor is connected in series with the paramagnetic transducer to limit the sample flow rate through the transducer This restrictor will produce approximately 250 ml min flow through the paramagnetic transducer for an inlet pressure of 5 psig A number of optional sampling components are available with the dual stream 2 18 configuration analyser These include needle valves to regulate the flow through the Gfx transducer The flow through the Gfx transducer should not exceed 2 0 l min Where the optional needle valves are not used then external provision to limit the sample flow to 2 0 I min should be provided The dual stream analyser configuration may only be used with external calibration valves It is not possible to use the optional internal calibration manifold in this configuration 2 10 Sample gas condition WARNING N Verify that connections are leak free at full operating pressure before applying sample or calibration gases These gases may be toxic or asphyxiant e Consideration should be given to the toxicity and asphyxiant nature of the sample gas when selecting a vent location Table 2 9 Sample gas conditions Sample pressure 1 5 psig 7 34 kPag Externally regulated to provide correct transducer flow rate Temperature Up to 60 C Conditions Oil free non corrosive non condensing Flow rate Paramagnetic transducer 50 250 ml min Gfx transducer 500 1500 ml min Particulates Filtered to remo
31. LITY ENTER PASSWORD To change the value of a digit 4 or Y 0000 To change to another digit lt or gt When the number shown is correct ENTER UTILITY 1 ts ENTER UTILITY 2 CLOCK NEW PASS t ENTER COMMS WINDOW TIME 12 54 Example of temporary display YES NO SET CLOCK To change the value of a digit 4 or Y SET YEAR 0000 To change to another digit lt or gt When the value shown is correct ENTER SET MONTH 00 i DATE 10 12 95 CHANGE DATE TIME ENTER SET DAY 00 E oo lt 9 SET HOUR 00 l SET MINUTE 00 SELECT FORMAT To select Day Month Year format ENTER DDMMYY MMDDYY To select Month Day Year format gt ENTER TIME 12 57 Example of temporary display DATE 10 12 95 SECTION 4 CALIBRATION 4 1 Introduction to calibration The calibration of the analyser may be checked or adjusted Either of these activities will result in an entry in the calibration history log Calibration may be manual or automatic In manual calibration the operator is guided through the required sequence of steps by messages on the xentra screen Each gas sensor module must be calibrated separately and each type has its own user interface as detailed later When the optional external autocalibration or internal autocalibration manifold are fitted a manual calibration adjustment or calibration check will use the autocalibration valves to select the calibration sample gases as required It is importa
32. MS r ENTER DIAGNOSTICS ID RELAY r Y ENTER ANALOGUE DISPLAY ANALOGUE t or Y to select the required analogue output 1 1 Oxygen T then ENTER or 1 1 UNASSIGNED 1 1 11 Oxygen R1 The information on each analogue output is L 99 000U 100 001 shown on four screens to obtain the next screen HS 1 1 11 Oxygen R1 To obtain the next screen 1 LIVE 0 FREEZE 1 1 11 Oxygen R2 To obtain the next screen 1 L 99 000U 100 00 1 1 11 Oxygen R2 This is the last of the four screens TRUE 0 FOLLOW t MEASURE to return to measurement display t QUIT to select another analogue output 6 3 6 6 Displaying alarm settings The conditions under which each alarm is configured to operate may be determined using the procedure described in Table 6 5 Table 6 5 Displaying alarm settings t MENU to obtain top level menu CALIBRATE SETUP rm ENTER ALARMS FAULTS SET ALARM ASSIGN t v ENTER DISPLAY UTILITY OUTPUTS ALARMS r ENTER DIAGNOSTICS ID SELECT MEASURE t or Y to select required measurement 11 Oxygen 1 When selected r ENTER 11 Oxygen AL1 LO The configuration of each of the four alarms 80 00 DISAB T AL1 to AL4 is shown on two screens making a total of eight screens to be viewed To obtain the next screen 1 4 11 Oxygen AL1 LO To obtain the next screen t HYST 0 1 FOL 11 Oxygen AL2 LO To obtain the next screen 95 45 ENABL 11 Oxygen AL2 LO To obtain the next screen HYST 0 3 FRZ
33. R gt lt f ll l Il Name up to 6 chars Units up to 3 chars Name up to 6 chars Units up to 3 chars L Figure 5 2 Format of serial output data frame Table 5 13 Setting the serial output frame frequency 5 15 t MENU to obtain top level menu CALIBRATE SETUP t to move the cursor to SETUP cursor ALARMS FAULTS position shown in inverse video t ENTER to choose SETUP SET ALARM ASSIGN t Y to move the cursor to DISPLAY DISPLAY UTILITY t K to move the cursor to UTILITY t ENTER to choose UTILITY ENTER PASSWORD Both user and supervisor passwords are 0000 factory set to 4000 The cursor will be on digit furthest to the left initially t aaa 4 to increment the first digit to 4 The display should now be showing 4000 t ENTER to enter the password UTILITY 1 t ENTER to choose UTILITY 1 UTILITY 2 CLOCK NEW PASS t v to move the cursor to COMMS COMMS WINDOW t ENTER to choose COMMS SET FRAME FREQ t ENTER to choose SET FRAME FREQ SET COMMS PARMS FRAME FREQUENCY Enter frame frequency 0000 To change the value of a digit 4 or Y To change to another digit lt or gt When the value shown is correct ENTER CLOCK NEW PASS To return to measurement display COMMS WINDOW MEASURE 5 16 Table 5 14 Setting the serial output communications parameters t MENU to obtain top level menu CALIBRATE SETUP t to move the cursor to SETUP cursor ALARMS FAULTS position shown in inverse vid
34. RY vi FIGURE Figure 1 1 Figure 1 2 Figure 1 3 Figure 1 4 Figure 1 5 Figure 2 1 Figure 2 2 Figure 2 3 Figure 2 4 Figure 2 5 Figure 2 6 Figure 2 7 Figure 2 8 Figure 2 9 Figure 2 10 Figure 2 11 Figure 2 12 Figure 4 1 Figure 4 2 Figure 5 1 Figure 5 2 Figure A 1 LIST OF FIGURES PAGE Key features of xentra e c x e eee 1 4 xentra measurement display 0 x e e eee eee 1 5 xentra process variable format 00000eeee eens 1 5 The xentra keypad sss s s x x x ee ae ee a ee Be ee ee 1 7 xentra status ICONS ss x x x ieee eerie eens 1 8 Recommended handling 000eeeeeeeeeeeeeeeeeee 2 2 Panel mounting detail 000 cece eee eee e eee eee 2 4 Rack installation exploded view 22 0000eeeeeee 2 5 Position of F2 in voltage selector for 170V to 264V operation 2 7 Position of F2 in voltage selector for 85V to 132V operation 2 7 Fuse holder spring ClipS 000ee cece eee e eens 2 7 Signal socket assembly 000 cece eee eee eee eee 2 12 Sample gland plate without auto calibration 2 17 Sample gland plate with internal auto calibration 2 17 Sample gland plate with external auto calibration 2 18 Typical single stream dual Gfx configuration 2 18 Typical dual stream dual Gfx configuration 2 19 Typical autocalibration sequence 220200006 4 9 Screen icons indicating autocalibration progress
35. Xentra 4900 Continuous Emissions Analyser Installation and Operation Manual Ref 04900 001B 4 Order as part 04900 001B The configuration of this xentra 4900 Continuous Emissions Analyser Model and Issue 0490 B1 Feature and option code number BSE Serial number Instrument Configuration Transducer l1 Transducer 12 Type Type Serial No Serial No Transducer 12 Transducer 12 Type Type Serial No Serial No Servomex Order Reference No Software Revision No Completed By Date WARNINGS CAUTIONS AND NOTES This publication includes WARNINGS CAUTIONS AND NOTES which provide information relating to the following WARNINGS Hazards which could result in personal injury or death CAUTIONS Hazards which could result in equipment or property damage NOTES Alert the user to pertinent facts and conditions NOTE This manual covers installation normal operation routine maintenance and fault diagnosis on the xentra models 4902B1 and 4904B1 lL Earth ground terminal The following symbols are used on the rear of the analyser Caution refer to operator manual LIST OF CONTENTS SECTION 1 INTRODUCTION x x x x x x eee ieee eee eee ee ee ees 1 1 1 1 Introduction sise ee ec ee aly al ee aca das See ene We ee 1 1 1 27 GIOSSALY Ga css Aad te ei ee ee ee ee i 1 1 1 3 General description 0 2 1 1 1 4 Location of components x x c e x x x x eee ee
36. Y 11 CELL TEMP LOW 1 rs Y K ENTER r ENTER The first fault is displayed if further faults are present an arrow will be shown e or Y to access information on further faults When faults have been viewed MEASURE to return to measurement display 6 1 6 4 Displaying relay configuration The conditions under which each relay will operate may be determined using the procedure described in Table 6 3 Table 6 3 Displaying relay configuration t MENU to obtain top level menu CALIBRATE SETUP rs ENTER SET ALARM ASSIGN 6 5 DISPLAY UTILITY ANALOGUE DISPLAY RELAY 1 3 ASSIGNED 1 or 1 3 UNASSIGNED 1 1 3 14 Oxygen AL4 LO 0 000 or 98 00 HIGH 1 or 1 3 FAULT1 or 1 3 CAL IN PROG T r Y ENTER r ENTER r ENTER t a or Y to select the required relay then ENTER The first allocation to this relay will be displayed if there are further allocations an arrow will be shown t or Y to access further allocations When all allocations for this relay have been viewed t QUIT to select another relay or t MEASURE to select measurement displa Displaying analogue output configuration The configuration of each analogue output may be determined by using the procedure described in Table 6 4 6 2 Table 6 4 Displaying analogue output configuration t MENU to obtain top level menu CALIBRATE SETUP pe gt ENTER ALARMS FAULTS SET ALARM ASSIGN rv ENTER DISPLAY UTILITY OUTPUTS ALAR
37. ables are modified using the UDEF menu entry The procedure for configuring the external inputs is given in table 5 8 Definition of the input scaling calibration of the external analogue inputs is accomplished via the MANUAL CAL menu see section 4 16 5 10 Table 5 8 External analogue input definition t EDIT to obtain window edit menu ENTER PASSWORD 0000 SELECT SCRN UDEF DEFINE SCRN VARS SELECT UDEF E1 mA E1 COMPONENT LELEII E1 ENG UNIT II SELECT SCRN UDEF DEFINE SCRN VARS To change to another digit lt or gt When the number shown is correct ENTER r ENTER t a or Y to select the required external analogue inputs E1 or E2 then nrs ENTER This entry determines the measurement name displayed Any combination of up to 6 characters may be used eg STRM 1 The character set available is listed in appendix C To change a character 4 or Y To change to another character lt or gt When the name is correct ENTER Note any character after the symbol is ignored This entry determines the label which follows the measurement value It is factory set to mA Changing this label does not affect the value To change the value of a digit 4 or Y displayed Change characters as above t MEASURE to return to measurement display 5 6 Defining and selecting measurement displays Up to five measurement display screens may be defined Each screen definition may have
38. al serial data output only pins 3 5 and 8 are used Pin 8 is only used if hardware handshaking using DTR data terminal ready is enabled In DTR mode the instrument will wait until CTS pin 8 becomes active At this point an output data set will be transmitted via pin 3 See section 5 9 for details on configuring the serial output port Table 2 5 Serial output connections PL6 Terminal Function 2 Received data RXD 5 Signal common ground S 2 12 2 8 External autocalibration connection For analysers configured with the external autocalibration option an additional output connector PL 8 is fitted into the sample gland plate see figure 2 10 This connector supplies two pairs of relay contacts which may be used to control external valves These relay contacts are rated at 1 0 A 264 V AC and 1 0 A 30 V DC non inductive Screened cable should be used to connect to solenoid valves of length not exceeding 3m with the screen terminated at the instrument end It will be necessary to fit a suppression device across the coils of the solenoid valves For DC supplies a diode is recommended For AC supplies a 0 047uF capacitor in series with a 100Q resistor would generally be found satisfactory Table 2 6 contains the connector pin out details Table 2 7 contains the truth table showing the relay contact conditions for sample gas calibration gas 1 and calibration gas 2 Table 2 6 External autocalibration connections T
39. analogue output value The user is free to set output span values that are below this Recommended minimum but the consequence will be a higher noise level on the output trace The limits on the analogue output span value are shown in table 5 4 5 5 Table 5 4 Analogue output span limits Transducer Minimum Maximum Recommended analogue output analogue output span span Gfx Standard CO 200 vpm CO 6000 vpm CO Gfx High Sensitivity CO 50 vom CO 1000 vpm CO Gfx NO 100 vom NO 2000 vpm NO Gfx Standard SO 500 vom SO 5000 vom SO Pm 1156 O 0 5 O 200 O Each analogue output may be assigned to any gas sensor module For each range of each analogue output used the following parameters need to be set up i Gas sensor module to which analogue output is to be assigned il Range to which analogue output is to correspond iii True or live zero ie 0 to 20 mA or 4 to 20 mA iv Freeze analogue output during calibration or follow calibration sample concentration See Table 5 5 for procedure The existing parameters for an analogue output may be edited or cleared See Table 5 6 for analogue output clearing procedure 5 6 Table 5 5 Setting up analogue outputs t MENU to obtain top level menu CALIBRATE SETUP rs gt ENTER ALARMS FAULTS SET ALARM ASSIGN pe gt ENTER DISPLAY UTILITY ENTER PASSWORD To change the value of a digit 4 or Y 0000 To change to another digit lt or gt When the num
40. ater than the current time date See Table 4 7 setting up auto calibration and auto check for the procedure 4 15 4 15 Scaling calibration of the external analogue inputs The external analogue inputs are scaled via the MANUAL CAL menu entry The mechanism for scaling of the inputs is to specify the variable value that corresponds to the minimum analogue input 0 or 4mA and the maximum analogue input 20mA The instrument then applies a linear scaling to input signals between these limits The user also defines if the analogue input is true zero 0 20mA or live zero 4 20mA The variable value specified for the maximum analogue input value 20mA must be a positive number and must be greater than the variable value specified for the minimum analogue input 0 or 4 mA The procedure for definition of the analogue input scaling is given in table 4 10 Table 4 10 External analogue input scaling t MENU to obtain top level menu CALIBRATE SETUP ENTER ALARMS FAULTS MANUAL CAL r ENTER AUTOCAL ENTER PASSWORD To change the value of a digit 4 or Y 0000 To change to another digit lt or gt When the number shown is correct ENTER CALIBRATE Use 4 or Y until selected analogue input is E1 Extern mA 1 displayed then ENTER SCALE INPUT t ENTER E1 MINIMUM INPUT t lt or gt to select desired choice then TRUE O LIVE 0 ENTER E1 MINIMUM OmA Change the number to the variable value that
41. ation gas sample connection 200e eee eens 2 21 2 12 Reading flowmeters xs x x x x x x x x x x x x x eee eee eee eee eens 2 23 2 13 POWer UD ciara tert teehee etek ae heat ne eee ee ere Bek 2 23 SECTION 3 INITIAL CONFIGURATION 0 000 x eee eee eee eee 3 1 3 1 Setting passwords 0 cece eee 3 1 3 2 Setting time and date eee 3 2 SECTION 4 CALIBRATION xs x GG x x eee 4 1 4 1 Introduction to calibration x x x x c e eee 4 1 4 2 Recommended calibration check periods 20000e0005 4 2 4 3 Setting low and high calibration tolerances 000e005 4 2 4 4 Paramagnetic transducer low and high manual calibration 4 3 4 5 Gfx gas transducer low and high manual calibration 4 5 4 6 Manual cal check low and high 000ceee eee e eee e eens 4 7 4 7 Auto calibration overview x x x x cece eee eee 4 9 4 8 Monitoring the progress of auto calibration 4 11 4 9 Auto calibration and auto check setup 200eeeeeeee 4 11 4 10 Initiating auto calibration or auto check from keypad 4 14 4 11 Initiating auto calibration or auto check by external contact closure 4 14 4 12 Aborting an auto calibration in progress xs x x x x x x x x x x x eens 4 15 4 13 Disabling auto calibration and autocheck 200 005 4 15 4 14 Restarting auto calibration or auto check after disabling 4 15 4 15 Sca
42. aying faults present 1 6 1 5 2 The xentra keypad User input to the xentra instrument is via the xentra keypad A view of the keypad is given in figure 1 4 xentra Figure 1 4 The xentra keypad The functions of the keys on the xentra keypad are as follows Measure key Pressing the MEASURE key at any time returns the instrument to the default measurement display see section 1 5 1 Menu key Pressing the MENU key activates the xentra top level menu Quit key Pressing the QUIT key aborts the current activity and returns the user interface to the menu level at which the activity was selected Pressing the QUIT key while in the top level menu or edit menu if activated via the EDIT key has no effect Edit key Pressing the EDIT key will give immediate access to the edit functions provided to modify the text on the measurement display This includes the names of measured variables the measurement units the displayed precision and the filtering applied A Ya K keys Within menu displays the user highlights the desired option using the arrow keys 4 Y a gt and then presses the ENTER key When entering numeric information or text the left and right arrow keys lt gt are used to move between characters or digits and the up and down arrow keys 4 Y are used to change each character or digit Reverse video is used to indicate the active WORD character or digit
43. ber shown is correct ENTER RELAYS r v ENTER ANALOGUE SELECT ANALOGUE t or Y to select the required analogue output 1 1 ASSIGNED 1 then m ENTER The message ASSIGNED or indicates that this output has been assigned 1 1 UNASSIGNED 1 previously ANALOGUE ASSIGN t ENTER The message ASSIGN appears if 1 1 EDIT CLEAR the output selected has not previously been or assigned otherwise the message EDIT appears 1 1 ASSIGN Y N SELECT MEASURE t or Y to select the measurement to be output 11 Oxygen T then ENTER 1 1 11 Oxygen R1 Change the numbers L Lower and U Upper L 000 00U 100 00 to the to the lower and upper sample concentration levels to which the analogue output is to correspond Note that negative values may be entered and that the decimal point may be moved Any digit position may be used for the decimal point To change the value of a digit 4 or Y To change to another digit or number lt or gt When both values are correct ENTER 1 1 11 Oxygen R1 To select 0 to 20 mA ENTER TRUE O LIVE 0 To select 4 to 20 mA ENTER 1 1 11 Oxygen R1 To hold analogue output during calibration FREEZE FOLLOW ENTER To allow analogue output to vary with calibration sample concentration ENTER 1 1 11 Oxygen R2 Repeat the process for range R2 L 00 00 U 100 00 SELECT ANALOGUE t a or Y to select another output then 1 1 ASSIGNED 1 ENTER or or SELECT ANALOGUE t MEASURE to return to measu
44. ce approximately 250 ml min flow through the paramagnetic transducer for an inlet pressure of 5 psig A number of optional sampling components are available with the single stream configuration analyser These include needle valves to regulate the flow through the Gfx transducers The flow through the Gfx transducers should not exceed 2 0 l min If the optional needle valves are not used then external provision to limit the sample flow to 2 0 l min should be provided The single stream analyser configuration may be used with either internal or external calibration valves Dual gas stream configuration Steam 7 OUT 8 Steam 2out Paramagnetic sensor Gfx sensors Pm 1156 0 5 min 0 500 ml min flow meter flow meter optional optional Needle valve oe x Needle valve optional optional Flow alarm Steam 2in R optional Steam 1 in E Filter Autocalibration via optional optional external valves only Figure 2 12 Typical dual stream dual Gfx configuration Figure 2 12 contains a typical flow diagram for dual stream configuration analysers The dual stream configuration is only used in the 4904 analyser when two Gfx transducers are fitted Here the two Gfx transducers are connected to two separate sample streams with different inlets and outlets If a paramagnetic transducer is supplied then this will be connected in parallel with the first Gfx transducer
45. chassis also supports two external analogue input signals The data from the external inputs may be displayed on the screen output to the analogue outputs and or output via the serial RS232 output The xentra 4900 is designed for use in modern industrial and laboratory environments The analyser is controlled using an on board microprocessor which gives the flexibility to configure the analyser to suit a wide range of applications The xentra is operated via simple keypad controls mounted on the front fascia of the analyser Adjacent to the keypad is a large Liquid crystal display LCD on which are displayed measurement values alarms and other data A number of optional features are available for the xentra 4900 These include the following Flow meters and needle valves to monitor and control sample gas flow through the instrument A sample filter to protect the gas sensor modules from particulate contamination A sample flow alarm to monitor the sample flow and alarm when the flow falls below a defined level An Autocalibration manifold to allow the instrument to be calibrated without user intervention Relay ouput contacts to allow autocalibration of the analyser via externally located valves Additional signal output cards to extend the number of analogue outputs and relay outputs available to the user Full technical specifications for this xentra model are presented in the Technical Data Sheet in Appendix
46. d national standards 2 7 2 6 Signal connections It is recommended that the analyser is switched off while signals are being connected or disconnected Signal terminals are located on the rear of the analyser and are identified as plugs PL1 to PL5 Two plugs PL1 and PL5 are always fitted PL2 PL3 and PL4 are present only when the corresponding option cards are fitted A loose 14 way socket connector with accessories is provided to make connections to each plug The plugs and sockets are keyed so that the sockets may only be located in the correct plug position The loose socket covers have an identification number which corresponds to the mating plug Ensure that each socket is always fitted with the correct covers The separate covers on PL1 to PL4 provide segregation between current output and relay wiring The sockets and cover must always be fitted and secured even when signals are not required Figure 2 7 shows the assembly of plugs PL1 to PL4 with segregated covers The assembly for plug PL5 is similar but with a single 14 way cover provided The loose sockets have screw terminal connections These will accept a flexible conductor which has across sectional area in the range 20 AWG to 16 AWG 0 5 to 1 5 mm or a solid conductor which has a cross sectional area in the range 20 AWG to 14 AWG 0 5 to 2 5 mm Solid conductors larger than 18 AWG 1 mm are difficult to dress inside socket covers and are therefore not recommended For co
47. d value on the display is known as a process variable and consists of four fields as shown in figure 1 3 Module location field 2 chars Measurement value field 6 chars Engineering units field 3 chars User defined message field 6 chars 12 6 vpm CO P Figure 1 3 Xentra process variable format 1 5 A module location field 2 characters 1 A measurement value field 6 characters An engineering units field 3 characters A user defined message UDM field 6 characters ROM The module location field defines whether the process variable represents an internal transducer or an external analogue input The letter T indicates an internal gas sensor module The letter E indicates an external analogue input The letter is followed by a number defining the gas sensor module site number The measurement field is a 6 character number representing the concentration measured by an internal transducer or the scaled analogue input value Should the measured value for a transducer exceed 120 of the specified full scale deflection for that transducer then the measurement field is replaced by the word OVER to indicate that the transducer is in over range condition The engineering units field is a user defined 3 character message identifying the units of measurement For Gfx transducers the user is offered a choice of the units to be displayed The options available are volume parts per million vom
48. e 1 4 1 5 Introduction to the xentra user interface 22205 1 4 1 5 1 The xentra measurement display 20000eeee eens 1 5 1 5 2 The xentra keypad ss s x x x x x x x x ewe eee ee 1 7 1 5 3 The xentra screenicons 000 cece eee eee 1 8 1 5 4 The xentra menu display 0000eee cece eens 1 9 1 5 5 Numeric data input cis x x x x e seis seer ek 1 10 1 5 6 Password protection 00 e e eee 1 10 1 6 Transducer site numbering system 200c ee eee ees 1 11 1 7 Output numbering system x e e e eee eee 1 11 1 8 Transducer full scale deflection 0c e eee eee ees 1 11 1 9 Technical assistance and spare parts 000e eee ee eee 1 12 SECTION 2 INSTALLATION x x e cece eee eee 2 1 2 1 Introduction 341440505 27a eit el ek eA a R RTK 2 1 2 2 Unpacking and Inspection xs x x x x x x x x x x x x x x x ee 2 1 2 3 Panel mount installation x x x x eee eee 2 3 2 4 Rack slide mounting installation xs x x x x x x x x x eee ee 2 4 2 5 Electrical power connection 000 eee eee eee eee eee 2 6 2 6 Signaliconnections 2 00 e e x cee eevee ee eee eee eee ee 2 8 2 7 Serial output connection 0 x K K K eee 2 14 2 8 External autocalibration connection xx x x x x x x x x x x eee eee 2 15 2 9 Sample stream connection 00 e e eee eee 2 16 2 10 Sample gas condition c e e x eee 2 20 2 11 Calibr
49. e assumes that the target gas is that specified for manual calibration See Table 4 5 for low calibration check procedure and Table 4 6 for high calibration check procedure The procedure uses the paramagnetic oxygen sensor as an example The procedure is identical for the other gas sensors only the component name and measurement units change 4 7 4 8 Table 4 5 Low cal check t MENU to obtain top level menu CALIBRATE SETUP ALARMS FAULTS MANUAL CAL AUTOCAL ENTER PASSWORD To change the value of a digit 4 or Y 0000 To change to another digit lt or gt When the value shown is correct ENTER CALIBRATE To select desired gas sensor module or 11 Oxygen T Y then ENTER if only one module is fitted this section will be omitted LOW HIGH 1 gt v C ENTER HISTORY CHK L amp H CHECK LOW CHECK HIGH 14 Oxygen CHK L Introduce low cal gas when the reading has CONC 0 5 stabilised t MEASURE to return to the measurement display and stamp the calibration check results in the history buffer Table 4 6 High cal check t MENU to obtain top level menu CALIBRATE SETUP r ENTER ALARMS FAULTS MANUAL CAL r ENTER AUTOCAL ENTER PASSWORD To change the value of a digit 4 or Y 0000 To change to another digit lt or gt When the value shown is correct r ENTER CALIBRATE To select desired gas sensor module or 11 Oxygen T Y then ENTER if only one module is fitted this secti
50. eedle valve and a rotameter type flowmeter The reading of the flow rate through the flowmeter is obtained by observing the scale indication at the top of the float 2 13 Power up The xentra may now be powered up A message sequence will be displayed eg SYSTEM OK xentra 4900 REV 4900 652 XX MODEL 4902B1 0302 2100 24101 00011 SERIAL NO XXXX ORDER NO XXXXXX MEASURING The measurement display should now appear If the display is unclear then the display viewing angle may be adjusted using a small cross point screwdriver See Figure 1 1 for location of the viewing angle adjustment potentiometer this is accessed from the bottom of the front fascia 2 22 SECTION 3 INITIAL CONFIGURATION 3 1 Setting passwords The xentra has two passwords the operator s password gives access to CALIBRATE while the supervisor s password gives access to EDIT SETUP and CALIBRATE The xentra is delivered with both of the passwords set to 4000 The passwords may be changed to any four digit number To change the passwords follow the procedure in Table 3 1 Table 3 1 Changing the passwords t MENU to obtain top level menu CALIBRATE SETUP IAALARMS FAULTS SET ALARM ASSIGN DISPLAY UTILITY ENTER PASSWORD NEW OPERATOR NEW SUPERVISOR PASS 0000 NEW PASS IS t K to move the cursor to SETUP cursor position shown in reverse video t ENTER to choose SETUP t v to move the cursor to DISPLAY t K to move the cursor t
51. ent handling ensure that the analyser is gripped securely underneath in the positions indicated in Figure 2 1 Lift and remove the xentra from its packing and inspect for any damage incurred during transit If damage has occurred inform Servomex or its agent immediately Retain all packing and shipping information The shipping carton may be used for future transportation After the initial visual inspection perform the following checks 1 Check that the specification details table in the front of this manual are in order and agree with the purchase requirements Pay particular attention to any inserted Instrument Modification Sheets 2 Check that the accessories are present and undamaged Standard xentra accessories provided are o Spare mains fuses suitable for electrical power voltage range ordered e Two connectors for wiring to standard chassis signal output plugs PL1 and PL5 o Electrical power cord with moulded IEC connector or loose IEC connector for wiring during installation Optional xentra accessories are e Connectors for wiring to each optional signal output plug PL2 to PL4 e Spanner and spare filter elements for those analysers configured with a sample filter e Rack mounting slides and kit of parts See Figure 2 3 2 2 WARNING The Xentra 4900 is not suitable for use in hazardous areas The Xentra 4900 is not suitable for use with corrosive or flammable samples The sample gas may be toxic
52. eo t ENTER to choose SETUP SET ALARM ASSIGN t Y to move the cursor to DISPLAY DISPLAY UTILITY t K to move the cursor to UTILITY t ENTER to choose UTILITY ENTER PASSWORD Both user and supervisor passwords are factory 0000 set to 4000 The cursor will be on digit furthest to the left initially t aaa 4 to increment the first digit to 4 The display should now be showing 4000 t ENTER to enter the password UTILITY 1 t ENTER to choose UTILITY 1 UTILITY 2 CLOCK NEW PASS t v to move the cursor to COMMS COMMS WINDOW t ENTER to choose COMMS SET FRAME FREQ t Y to move the cursor to SET COMMS SET COMMS PARMS PARMS t ENTER to choose SET COMMS PARMS SELECT STOP BIT Enter required stop bit 1 1 5 2 To change to another selection lt or gt When the value shown is correct ENTER SELECT DATA BITS Enter required number of data bits 8 7 6 5 To change to another selection lt or gt When the value shown is correct ENTER SELECT PARITY Enter required parity EVEN ODD NONE To change to another selection lt or gt When the value shown is correct ENTER SELECT BAUD RATE Enter required transmission baud rate 9K6 4K8 2K4 19K2 To change to another selection lt or gt When the value shown is correct ENTER SELECT CONTROL Enter required hardware hand shaking DTR NONE To change to another selection lt or gt When the value shown is correct ENTER 1 8 E 9K6 DTR Confirm that the specified communica
53. er to the stage indications as shown in figure 4 1 This figure shows the transducer response of a typical transducer during the auto calibration process In figure 4 1 the first calibration gas cal gas 1 is used to measure the transducer zero response and the second calibration gas cal gas 2 the span response Transducer response DV Lag DV Lag DV Lag DV Lag lt gt lt gt lt gt lt gt Span level Zero level Figure 4 1 Typical autocalibration sequence 4 9 1 The automatic calibration procedure is started by either user keyboard input triggered by the instrument internal clock or via external contact closure At this point the Calibration in Progress output signal is turned on The first calibration gas is applied and the instrument then waits for the user specified DV lag This is the time for the transducer response to settle to its stable value 2 At the end of the DV lag period the response of the transducer is measured and a zero correction calculated A new value for the correction is stored and applied to the output immediately which may result in a change The instrument waits for one minute in this state to provide a visible chart recorder trace of the new output In addition the magnitude of the change is stored in the low calibration history log 3 The second calibration gas is applied to the transducer and the instrument waits for the user specified DV lag 4 At the end of the DV lag period t
54. erminal Function Ground Relay contacts for valve 1 Sample Calibration selection Relay contacts for valve 2 Poe Cal Gas 1 Cal Gas 2 selection Table 2 7 External autocalibration truth table Gas Required Relay Contacts for Relay Contacts for Valve 1 Valve 2 Sample gas OPEN OPEN Calibration gas 1 CLOSED OPEN Calibration gas 2 CLOSED CLOSED 2 14 2 9 Sample stream connection WARNING Verify that connections are leak free at full operating pressure before applying sample or calibration gases These gases may be toxic or asphyxiant Consideration should be given to the toxicity and asphyxiant nature of the sample gas when selecting a vent location The xentra 4900 is supplied with the internal transducers configured on either one or two sample streams Sample and calibration gases pass into and out of the chassis via a gland plate mounted on the rear of the chassis This gland plate will be provided in one of the three following versions a No autocalibration a Internal autocalibration valve manifold a External autocalibration manifold The sample gland plate without auto calibration See Figure 2 8 provides up to four sample inlets and a corresponding outlet for each inlet When optional internal auto calibration solenoid valves are used a valve manifold is mounted in the sample gland plate See Figure 2 9 This provides ports for sample inlet and outlet and inlets for two calibration gases The
55. g the same number of decimal places in the output number The data frame could be sent to either a dumb terminal a distributed control system or PC or a serial printer 5 14 The following facilities are provided to configure the system SET FRAME FREQ This sets up the frequency of transmission of the data frame down the RS232 communications port For example if the value is set to 15 seconds then the output data frame will be transmitted once every 15 seconds The frequency is set in steps of one seconds from 1 to 9999 seconds If the value is set to zero then the transmission of data down the RS232 port stops and will not restart until a non zero value is entered The procedure for setting the frame frequency is given in table 5 13 SET COMMS PARMS This sets up all the serial communications related parameters These are defined in table 5 12 The procedure for setting up the communications parameters is given in table 5 14 Table 5 12 Serial communications parameters Parameter Default Number of data bits 5 6 7 or 8 Parity EVEN ODD or NONE Baud rate characters per second 9600 4800 2400 or 19200 Hardware handshaking DTR or NONE No Process Variables 2 chars Time HH MM SS 8 chars A 9 O gt a Q Q 2 b a Process Variable 1 Process Variable 2 Check sum 4 chars End Code 2 chars Start Code 1 23 05 95 10 09 16 02 CO 50 0 vpm O2 20 95 096A lt C
56. ge the value of a digit 4 or Y 0000 To change to another digit lt or gt When the number shown is correct ENTER SELECT SCRN UDEF r gt ENTER DEFINE SCRN VARS SELECT UDEF t a or Y to select the required gas sensor 11 Oxygen module then ENTER 11 COMPONENT This entry determines the measurement name LILII displayed this is factory set to a relevant gas measurement name Any combination of up to 6 characters may be used eg STRM 1 The character set available is listed in appendix C To change a character 4 or Y To change to another character lt or gt When the name is correct ENTER Note any character after the symbol is ignored 11 ENG UNIT This entry determines the label which follows the measurement value it does not affect the units used to display the measurement value It is factory set to or vpm Changing this label does not affect the value displayed Change characters as above SELECT SCRN UDEF t MEASURE to return to measurement display DEFINE SCRN VARS 5 9 5 5 External analogue input configuration The naming and configuration of external analogue inputs is treated identically to internal process variables Two external analogue inputs are provided on the instrument The process variables associated with these inputs are identified as E1 and E2 the internal transducer process variables are l1 to 141 The name and engineering units for these vari
57. he response of the transducer is measured and a span correction calculated A new value for the correction is stored and applied to the output immediately which may result in a change The instrument waits for one minute in this state to provide a visible chart recorder trace of the new output In addition the magnitude of the change is stored in the high calibration history log 5 The first calibration gas is re applied to the transducer and the instrument waits for the DV lag 6 No action is taken at this point for the type of transducer in this example since both its zero and span calculations have completed 7 The sample gas is re admitted to the transducer and the instrument waits for the user specified DV lag 8 Upon completion of this final DV lag period the Calibration in Progress output signal is turned off The instrument is now returned to normal operation If auto check had been selected values of correction parameters would not have been calculated at points 2 and 4 in the cycle Instead differences between the transducer reading at these points and the specified test gas would be recorded in the corresponding calibration history log For a transducer where calibration gas 1 is the span gas and calibration gas 2 is the zero gas then the zero calculation occurs at point 4 and the span calculation at point 6 in the cycle NOTE If an out of calibration tolerance fault is generated during the autocalibration procedure the
58. ibration process The procedure is shown in table 4 9 Table 4 9 Aborting auto cal or auto check t ANY KEY to obtain the following screen AUTO CAL IN PROG t ENTER to abort the auto cal or auto check TERMINATE YES NO t K ENTER to continue auto cal or auto check On aborting the auto calibration or auto check then a post flush with sample gas will be performed with the relevant icon G in figure 4 1 displayed on the measurement screen If it is required to abort the post flush then the procedure given in table 4 9 may be repeated NOTE Once an autocalibration abort is activated the only way to avoid the abort is to use the ENTER sequence Hitting any other key including the QUIT key whilst in the abort screen will only act to initiate a post flush Using the QUIT key will not cancel an autocalibration abort 4 13 Disabling auto calibration and autocheck To disable auto calibration or auto check it is necessary to i Set PERIOD DAYS 0 and PERIOD HOURS 0 ii QUIT without entering a start time See Table 4 7 setting up auto calibration and auto check for the procedure NOTE If a start time that has already passed is set this will also disable the internal timer 4 14 Restarting auto calibration or auto check after disabling To re enable auto calibration or auto check it is necessary to i Set PERIOD to a non zero time either hours or days ii Enter a valid start time Here valid means l
59. ignment 1 3 EDIT CLEAR SELECT RELAY t MEASURE to return to measurement 1 3 UNASSIGNED display 5 3 Analogue outputs The xentra has between two and eight analogue outputs depending on the number of option cards fitted Each analogue output has two ranges referred to as R1 and R2 Range R1 is the default range if range R2 is to be selected using the external contact facility then both ranges need to be set up Both ranges for an analogue output may be set to the same value so that switching between R1 and R2 has no effect The analogue output assignments have the facility for full zero suppression and range expansion This is user specified by defining the concentration values that represent the minimum and maximum analogue output value The difference between these maximum and minimum concentrations is known as the span of the analogue output The minimum and maximum span of the analogue outputs is subject to limits that are dependent on the transducer to which the output is assigned Each transducer has a minimum and maximum span The maximum value for the span is scaled to the transducer full scale deflection FSD concentration value FSD see section 1 8 It is set to 2 times the transducer FSD value There are no enforced limits to the minimum output span The minimum Recommended limits are based on 100 times the normal transducer noise level When set to the minimum Recommended span the output noise level will be 1 of the maximum
60. ii A minus sign The minus sign may only be positioned in the first character The position of the decimal point may be changed from that offered as a default Any digit position except the right most digit may be used for the decimal point The following are examples of valid numeric data entries 2033 0100 The following is an example of an invalid data entry 9999 Last character should not be decimal point If an invalid data entry is made at a point in the user interface then the input will be ignored and the display return to the start of the data entry screen that precipitated the invalid entry No warning message will be generated NOTE If the Measure Menu Quit or Edit keys are used to terminate a data entry rather than the Enter key then the data entered is lost 1 5 6 Password protection Some user interface operations require the use of a password There are two passwords a supervisor password which gives access to SETUP and CALIBRATION and an operator password which gives access to CALIBRATION only Both of the passwords are factory set to 4000 these may be changed if required See 3 1 Setting passwords 1 6 Transducer site numbering system The xentra chassis may accommodate a number of internal transducers which are assigned site locations represented as l1 12 and 12 on the display For the 4902 analyser the chassis may accommodate up to two internal transducers This is normally a Gfx transducer
61. le parts inside Enclosure protects against shock and injury Refer servicing to qualified personnel To comply with the European Community EMC Directives for industrial environments the interconnecting cables used for the mains supply relay contact outputs and or analogue output signals should be screened or provide equivalent protection Electrical power is connected to the chassis via an IEC appliance adaptor located on the rear of the chassis see Figure 1 1 The xentra supplied will already be configured for the mains voltage range ordered 85 to 132V or 170 to 264V Figure 2 4 Position of F2 in voltage Figure 2 5 Position of F2 in voltage selector for 170V to 264V operation selector for 85V to 132V operation The voltage setting may be changed as follows The fuse value must be changed when the voltage setting is changed e Unplug the mains connector see Figure 1 1 e Remove the voltage selector a screwdriver may be used in the slot at the top of the voltage selector to aid ejection e Rotate the voltage selector through 180 so that the required voltage is shown at the bottom of the voltage selector e Fit fuse F2 to the right hand side of the voltage selector according to the voltage selected Voltage selector position 220 240V for 170 to 264V 2 6 operation fit fuse T3 15A HBC to IEC 127 Figure 2 4 Voltage selector position 110 120V for 85 to 132 V operation fit fuse T5 0A HBC to IEC 127 Figure 2 5 If
62. lide support clamp but do not tighten e Fit the slide support item 3 between the cage nuts item 4 and the slide support clamp item 5 note that the front slide supports face backwards and the rear slide supports face forwards e Tighten the two waisted screws item 6 to clamp the slide support item 3 between the cage nuts item 4 and the slide support clamp item 5 o Loosely fit the two rack slide outer sections item 1 to the slide supports item 3 in four places using fixings items 7 8 9 10 Note that the slide outer section item 1 should be mounted so that the slide inner item 1 2 5 slides in from the front o Position the rack slide outer sections item 1 so that the front edge is 35 mm behind the rack enclosure front flange Tighten the fixings items 7 8 9 10 e Install the analyser in the rack locating the inner slide section item 1 inside the outer slide section item 1 e Secure the analyser into the rack cabinet using the screws item 11 and the plastic cup washers item 12 2 5 Electrical power connection WARNINGS The installer must be satisfied that the Xentra 4900 installation conforms to the relevant safety requirements National Electrical Code and any other local regulations and that the installation is safe for any extremes of conditions which may be experienced in the operating environment of the analyser This appliance must be connected to a protective earth No user serviceab
63. ling calibration of the external analogue inputs 4 16 SECTION 5 MAIN CONFIGURATION x x x x x x x x e cece eee eee eee eee 5 1 Sl AIBRMS On ol bree itil eee weer EEEE EEE EE minke EEE well el 5 1 5 2 Allocation of relays sii aa cn x x x x x x a we enw ww Rn ew en 5 3 5 3 Analogue outputs xs eked ek eek el ok eke ek ot eek ek oko 5 5 5 4 Component name definition 00 cee eee eee 5 9 5 5 External analogue input configuration ss x x x x x x x x x x x eee x x 5 10 5 6 Defining and selecting measurement displays 5 11 5 7 Display resolution fe ete x x x x x x x x id ee we a aia wa wie ee a 5 12 5 6 iROCSPONSE UME o erite RE RRR E kee ee ee re re re kee 5 12 5 9 Display units sss sg eee ee ee ee ee ee RRR ee 5 12 5 10 Calculation of total nitrogen oxides NO concentration 5 13 5 11 Serial output communications 00c cece eee eee eens 5 14 SECTION 6 REVIEW lt ce R K R crete iene eee choi kek enw ehon aes 6 1 6 1 Introduction to review section xs x x x x x x x x x x x ee 6 1 6 2 Displaying alarms present 0 x x x eee ee 6 1 6 3 Displaying faults present x x K ee 6 1 6 4 Displaying relay configuration x x x x eee 6 2 6 5 Displaying analogue output configuration 200005 6 2 6 6 Displaying alarm settingS x x x x x x x x x ee 6 4 6 7 Displaying analyser identity x x c e e eee eee eee 6 5 6 8 Di
64. m level of 98 00 showing that the sample concentration is below 98 00 Note that if hysteresis has been specified when configuring the alarm the alarm will not clear until the concentration has reached the alarm level plus the hysteresis Table 6 7 describes the procedure for displaying the alarm history 6 5 Table 6 7 Displaying alarm history t MENU to obtain top level menu CALIBRATE SETUP pe Y ENTER ALARMS FAULTS DISPLAY ALARMS pe Y ENTER ALARM HISTORY Oxygen AL2 ON t a or Y to view further entries 12 13 20 12 06 1 t MEASURE to return to measurement displa 6 9 Displaying fault history An entry is made in the fault history buffer each time a fault appears or is cleared The fault history file contains the most recent 20 occasions where a fault appeared or was cleared Table 6 8 describes the procedure for displaying the fault history Table 6 8 Displaying fault history t MENU to obtain top level menu CALIBRATE SETUP r v K ENTER ALARMS FAULTS DISPLAY FAULTS ts Y ENTER FAULT HISTORY 11 CELL T LOW ON t or Y to view further entries 12 13 20 12 06 T t MEASURE to return to measurement displa For details of the information provided by the fault messages please refer to Section 4 of the Service Manual Part No 04900002B 6 10 Displaying calibration history An entry is made in the calibration history buffer each time a calibration or calibration check is performed The calibration history file contains the
65. mpliance with EMC standards connections to current outputs must use screened or shielded cable with either separate screened pairs or two pairs with an overall screen The screens or drain wire for foil screens must be terminated at pin 1 or pin 6 both if separate screened pairs are used All signal inputs plug PL5 must use screened or shielded cables with the screen or drain wire terminated at the functional earth stud M4 adjacent to PL5 After wiring the loose sockets the covers must be re fitted for safe operation To avoid straining the screw terminal connections attach the cable sheath to the cover by trimming and folding out the appropriate section of the cover and securing the cable to it using the cable tie provided Clip the remaining cover sections into place around the cable The loose sockets are provided with end blocks and jack screws which must be fitted and used to secure them to the corresponding plug Do not over tighten screws The signal terminals each have a legend indicating their function Plugs PL1 to PL4 provide the analogue output and relay output electrical connections PL1 is provided as standard and contains 3 relay outputs and two analogue outputs PL2 to PL4 are optional and provide two relay outputs and two analogue outputs each The connection details for PL1 to PL4 are summarised in Table 2 3 The option card population may be determined by reading the code number from the label on the under side of
66. n as the high calibration gas for other transducers and vice versa The gas mixtures recommended for calibration of the instrument will depend on the gas components measured by the transducers fitted to the gas stream and the measurement ranges of the transducers The recommended gases are limited by the long term storage stability of the components of the mixture Certain gas mixtures should be avoided as these will not be stable with time For example gas mixtures containing O N and NO are not stable and should not be used Table 2 10 shows gas components recommended in the two gas mixtures needed Table 2 11 shows the recommended concentration of the gas components in the mixture For example the recommended gas mixtures for a xentra 4900 analyser fitted with a paramagnetic transducer NO Gfx transducer and standard sensitivity CO transducer would be as follows Calibration gas 1 CO 200 vpm Air Balance Calibration gas 2 NO 100 vpm N Balance 2 20 Table 2 10 Recommended calibration gases Gas Components Calibration gas 1 Calibration gas 2 Measured CO only or CO 0 Zero grade N CO in air gas mix NO only or NOO NO in N gas mix Air SO only or SO 0 SO in air gas mix CO NO or CO NO O0 NO in N gas mix CO in air gas mix CO SO or CO SO 0 CO SO in air gas mix NO SO or NO SO 0 NO in N gas mix SO in air gas mix Zero grade nitrogen is 99 998 purity with total impurities not exceeding
67. n this may only be removed by performing a subsequent successful ie in limits auto calibration 4 10 4 8 Monitoring the progress of auto calibration When the autocalibration facility is initiated an icon appears at the bottom of the screen Progress of the autocalibration cycle can be monitored through each of the phases described in section 4 8 from the appearance of the icon Figure 4 2 shows the different icon shapes that indicate the progress of the calibration AUTO AUTO AUTO AUTO AUTO AUTO AUTO CAL CAL CAL CAL CAL CAL CAL 26 6 gt 0 lt hh khidki gt gt D E F G Figure 4 2 Screen icons indicating autocalibration progress The phase of autocalibration represented by each icon is as follows the numbers refer to the events in Fig 4 1 A First calibration gas flushing DV lag between 1 and 2 Measuring first calibration gas period between 2 and 3 Second calibration gas flushing DV lag between 3 and 4 Measuring second calibration gas period between 4 and 5 First calibration gas flushing again DV lag between 5 and 6 Re measuring first calibration gas period between 6 and 7 Sample gas flushing DV lag between 7 and 8 G Tm GO 4 9 Auto calibration and auto check setup The time and date must be correctly set before setting up auto calibration or auto check see 3 2 Setting time and date This will prevent unexpected behaviour due to incorrect clock set up The following calibration pa
68. nnel only are presented in the xentra 4900 Service Manual The service manual may be ordered from Servomex using part number 4900002A WARNING The user should note that the xentra 4900 instrument contains no user serviceable parts inside The instrument enclosure protects the user from electric shock and other hazards All servicing should be referred to qualified personnel 1 2 Glossary FSD Full scale deflection the maximum range over which a measurement may be made see section 1 8 DV Dead volume Top level menu The first menu this leads on to a succession of other menus VARS Variables for each sensor UDEF User defined data 11 14 Internal gas sensor modules 1 4 E1 E2 External analogue inputs 1 and 2 Gfx Gas filter correlation infra red Pm Paramagnetic 1 3 General description The Servomex xentra chassis is a platform into which gas sensor modules may be fitted to make precise measurements Up to three modular gas sensors for a wide range of gases and concentration levels selected according to the customer s needs reside in the xentra chassis The xentra chassis provides power gas connections and other support functions to the gas sensor modules and receives their outputs from which it calculates sample gas concentrations The calculated gas concentrations then may be displayed on the LCD display screen directed to the analogue outputs and or directed to the serial RS232 output 1 1 The xentra
69. nt to note that different calibration gases may be used to LOW and HIGH calibrate each transducer Also the gas used to LOW calibrate one transducer may be used to HIGH calibrate another The calibration gas CAL1 or CAL2 that is to be used as LOW and HIGH calibration for each transducer is set up in the autocalibration parameters set up menu The procedure for setting the gases to be used as LOW and HIGH calibration is given in section 4 9 see also table 4 7 If the analyser is still warming up as indicated by the warming up icon and a calibration is attempted a warning message will be given with an option to proceed The warming up icon indicates that at least one of the fitted gas sensor modules is still warming up The transducer that the user may wish to calibrate may of course already be at its operating temperature and be capable of calibration even though the warming up icon is still displayed The warming up icon will normally have cleared within 1 hour The warming up icon clears when all gas sensor modules are within temperature band For optimum performance a further period of time should be allowed for the gas sensor modules to reach final temperature before performing calibration This may take up to 6 hours Alternatively calibration checking and calibration adjustment may be performed automatically provided that either the internal or external auto calibration options are fitted The auto calibration options appear in the u
70. ntries 01 15 20 28 111 t MEASURE to return to measurement display NOTE If an autocal is unsuccessful it will not appear in the Calibration History However the fault codes associated with that event will be held in the Fault History 6 7 6 11 Displaying diagnostics information The signals from gas sensors may be displayed These may be useful in diagnosing any problems which may arise The procedure for displaying diagnostics information is described in Table 6 10 Table 6 10 Displaying diagnostic information t MENU to obtain top level menu CALIBRATE SETUP pe gt ENTER ALARMS FAULTS SET ALARM ASSIGN r Y ENTER DISPLAY UTILITY OUTPUTS ALARMS r Y ENTER DIAGNOSTICS ID 12 CELL EMF t a to view further diagnostics information 0 234 Volts 1 12 CELL TEMP t a to view further diagnostics information 35 5 C 1 11 CO DIF SIG t a to view further diagnostics information 0 003 Volts 1 11 CO GAS SIG t 4 or Y to view further diagnostics information 0 900 Volts 1 t MEASURE to return to measurement displa 6 8 SECTION 7 ROUTINE MAINTENANCE 7 1 Replacing fan filter element The external fan filter element should be checked every six months in laboratory conditions for environments with a high dust content this period should be reduced The filter element is washable and in laboratory or light dust conditions may be washed and refitted rather than replaced e Remove power from the analyser and unclip the filter cove
71. o UTILITY t ENTER to choose UTILITY Both user and supervisor passwords are factory set to 4000 The cursor will be on digit furthest to the left initially t 4 4 to increment the first digit to 4 The display should now be showing 4000 t ENTER to enter the password t ENTER to choose UTILITY 1 t to move the cursor to NEW PASS t ENTER to choose NEW PASS To change supervisor password t ENTER to choose SUPERVISOR To change operator password t Y to move the cursor to OPERATOR t ENTER to choose OPERATOR Enter new password To change the value of a digit 4 or Y To change to another digit lt or gt When the value shown is correct ENTER To accept the new password ENTER To reject the new password amp ENTER To return to measurement display MEASURE 3 1 3 2 Setting time and date The time date and date format Day Month Year or Month Day Year may be set by following the procedure in Table 3 2 History log entries will have an incorrect time and date stamp prior to setting the clock time and date The time and date must be set correctly before setting up auto calibration The time and date are retained for at least two days while the analyser is switched off the configuration and all calibrations are retained indefinitely 3 2 Table 3 2 Setting time and date t MENU to obtain top level menu CALIBRATE SETUP e ENTER ALARMS FAULTS SET ALARM ASSIGN r v K ENTER DISPLAY UTI
72. on will be omitted LOW HIGH t gt v C ENTER HISTORY CHK L amp H CHECK LOW pe Y ENTER CHECK HIGH 14 Oxygen CHK H Introduce high cal gas when the reading has CONC stabilised MEASURE to return to the measurement display and stamp the calibration check results in the history buffer 4 7 Auto calibration overview As implied by the name the auto calibration facility allows the instrument s calibration to be updated or checked without user intervention The auto calibration software function is only available if an autocalibration hardware option is fitted to the instrument Autocalibration facilities are offered to either measure or check the following Transducer low calibration zero calibration Transducer low and high calibration both zero and span In auto calibration two user defined gases cal gas 1 and cal gas 2 are provided to the instrument These gases may be either for low or high calibration of the transducers In some cases the same gas may be used for low calibration of one transducer while being the high calibration of another The gases are introduced to the analyser in three phases Phase 1 cal gas 1 Phase 2 cal gas 2 Phase 3 cal gas 1 again All of the transducers connected will be autocalibrated simultaneously but the specific zero or span calculations may occur during different phases The following stages define the autocalibration process The numbers ref
73. oper viewing Adjust viewing angle angle of display NO DISPLAY Unit power is off Turn on power If the display is functional but a measured value field is replaced by the word OVER the related transducer is outside its operating range see Section 1 8 8 6 NOTES SECTION 9 SPARES 9 1 Ordering spares Spare parts may be ordered from addresses shown on the rear cover of the manual When ordering spares always give the model and serial number of your analyser The analyser serial number is on the identification label on the underside of the analyser it may also be displayed via the user interface WARNING There are no user serviceable parts inside of the xentra 4900 analyser The instrument enclosure protects against electrical shock and injury Refer servicing to qualified personnel Removal of the enclosure lid may invalidate the instrument warranty 9 2 Spare parts list Spare parts common to all xentra 4900 models 04900001B Operator manual 4900 Model B 04900002B Service manual 4900 Model B 4000978 Main power fuses for 170 264V operation 10 off 20mm 13 15 A HBC 4000979 Main power fuses for 85 132V operation 10 off 20mm T 5 0 A HBC S4000986 Kit socket 14W signal 2388 1981 Filter element 80 mm Sq fan Spare parts for rack mounting S4000984 Rack mount kit short chassis 4000985 Rack mount kit long chassis Spare parts for sample filter 4000987 Kit fine filter cap and o ring 4000988 Ki
74. or asphyxiant and must be vented to a safe location CAUTION Install the 4900 so that fan and cover vents are not obstructed 2 3 Panel mount installation See Figure 2 2 for panel mounting detail In panel mounting format the xentra 4900 is supplied with a pair of mounting brackets item 1 on figure 2 2 suitable for mounting the front of the instrument against a panel These brackets are not intended to provide the sole means of support for the analyser The user must provide additional means of support at the rear of the instrument item 2 on figure 2 2 WARNING The rack mounting brackets are not intended to provide the sole means of support The user must provide additional support at the rear of the instrument 2 3 Cutout Dimensions 447x 134 mm Mounting holes should be M6 or 7mm clearence Figure 2 2 Panel mounting detail 2 4 Rack slide mounting installation See Figure 2 3 and Table 2 1 The 19 optional rack slide mount version is supplied with a mounting kit which includes either long or short slides and rack mounting brackets Do not attempt to support or carry the analyser by the rack mount brackets The analyser is suitable for installation in most standard rack types including Schroff and Rittall Figure 2 3 Rack installation exploded view 2 4 Table 2 1 Rack mount installation kit parts list Description Telescopic slide inner and outer Screw M5 Slide support bracket Cage nut Slide
75. ored calibration parameters This limit is called the low or high calibration tolerance If the calibration tolerance limit is exceeded during auto calibration then the auto calibration will be aborted and a fault will be indicated If the calibration tolerance limit is exceeded during manual calibration a warning will be given with an option to proceed See Table 4 2 for information on setting these tolerances The calibration tolerance values are expressed in terms of the full scale deflection FSD of the transducer see section 1 8 4 2 Table 4 2 Setting low and high calibration tolerances t MENU to obtain top level menu CALIBRATE SETUP rs gt ENTER ALARMS FAULTS SET ALARM ASSIGN pe Y gt ENTER DISPLAY UTILITY ENTER PASSWORD To change the value of a digit 4 or Y 0000 To change to another digit lt or gt When the number shown is correct ENTER UTILITY 1 pe Y ENTER UTILITY 2 UTILITY 2 To select desired gas sensor module or IT Oxygen 1 Y then ENTER if only one module is fitted this section will be omitted LOW amp HIGH TOL 11 Oxygen LO TOL Enter the required low calibration tolerance 00 00 OF FSD Any digit position may be used for the decimal point To change the value of a digit 4 or Y To change to another digit lt or gt When the value shown is correct r ENTER 11 Oxygen HI TOL Enter the required high cal tolerance 00 00 OF FSD Any digit position may be used for the decimal
76. quired alarm SELECT AL1 2 3 4 When selected ENTER 11 Oxygen AL1 To enable alarm ENTER ENABLE DISABLE To disable alarm me gt ENTER 11 Oxygen AL1 To freeze this alarm state during calibration FREEZE FOLLOW ENTER To allow this alarm state to change during calibration r ENTER 11 Oxygen AL1 To alarm when the sample concentration is HIGH LOW ALARM greater than the alarm level ENTER To alarm when the sample concentration is less than the alarm level ENTER 11 Oxygen AL1 LO Change the number to the required alarm LEVEL 00 000 level Any digit position may be used for the decimal point To change the value of a digit 4 or y To change to another digit lt or gt When the value shown is correct ENTER 11 Oxygen AL1 LO Change the number to the required hysteresis HYST 00 000 FSD Any digit position may be used for the decimal point To change the value of a digit 4 or y To change to another digit lt or gt When the value shown is correct r ENTER 11 Oxygen t to select required alarm Repeat SELECT AL1 2 3 4 procedure for the remaining alarms for this gas sensor module When all alarms have been set for a gas sensor module QUIT to select another gas sensor module When all alarms have been set up MEASURE to return to measurement display 5 2 Allocation of relays Each relay is set up by selecting the conditions under which it is to operate Each relay may be set up to respond
77. r complete with filter element and plastic gauze e Remove the plastic gauze and old filter element from the cover 6 Fit new filter into cover followed by plastic gauze e Clip cover back onto fan 7 2 Replacing sample filter element Analysers fitted with a sample filter should have the element replaced every six months or more frequently if required WARNING Sample and calibration gases may be toxic Stop sample flow into analyser to avoid releasing gas into atmosphere when sample filter cap is removed e Stop sample flow to analyser o Use spanner provided to unscrew sample filter cap 6 Remove old filter element and rubber o ring e Fit new sample filter and rubber o ring Ensure that rubber 0 ring is properly seated on the filter cap e Fit sample filter cap and tighten using spanner e Verify that there are no leaks 7 3 Cleaning The exterior of the analyser should be regularly cleaned using a slightly damp cloth Remove power before cleaning Ventilation holes must be kept clear Do not use solvents or abrasive cleansers to clean the analyser 7 1 7 4 Toxic Samples routine leak test WARNING If toxic samples are being analysed it is essential to check the analyser and associated sample lines system for leaks every 6 months is recommended period MAX pressure that may be applied to each module is 8 psig however this must be applied slowly to both the inlet and outlet simultaneously to
78. rameters must be set up when auto calibration or auto check is to be used Low or low and high autocalibration checks Low sample concentration for each process variable High sample concentration for each process variable Auto calibration or auto check Auto calibration period ie time between auto calibrations checks Date and time of first autocal note that a time already past will disable timed autocals o Dead volume DV lag Refer to Table 4 7 for the procedures required to set these values 4 11 The DV lag may be set between 0 5 and 8 minutes in steps of 0 5 minutes After the DV lag each calibration gas will flow for a further minute This is to allow the new level to be recorded on a chart recorder The autocalibration sequence will calibrate all transducers fitted It is important to note that different gas bottles may be used for low and high calibration of each transducer All calibration concentration values are set and displayed in the primary unit for the transducer regardless of the units used for the display 4 12 Table 4 7 Setting up auto calibration and auto check t MENU to obtain top level menu CALIBRATE SETUP ALARMS FAULTS MANUAL CAL r v ENTER AUTOCAL ENTER PASSWORD To change the value of a digit 4 or Y 0000 To change to another digit lt or gt When the number shown is correct ENTER SET UP CAL PARM t ENTER ONE CYCLE SELECT AUTO CAL t ENTER to select low only LOW LOW
79. rement NA NED lj Table 5 6 Clearing an analogue output assignment t MENU to obtain top level menu CALIBRATE SETUP t ENTER ALARMS FAULTS SET ALARM ASSIGN r ENTER DISPLAY UTILITY ENTER PASSWORD To change the value of a digit 4 or Y 0000 To change to another digit lt or gt When the number shown is correct ENTER RELAYS r Y ENTER ANALOGUE SELECT ANALOGUE t a or Y to select the required previously 1 1 ASSIGNED 1 assigned output analogue output then re ENTER ANALOGUE ASSIGN t ENTER to clear the assignment 1 1 EDIT CLEAR SELECT ANALOGUE t MEASURE to return to measurement NA INED displa 5 4 Component name definition The component name of each measurement the xentra makes will already have been defined This may be changed to any name up to six characters in length See Table 5 7 for procedure The characters which may be used are listed in appendix C The default character is which is used to indicate the maximum number of characters allowed If fewer than the maximum number of characters is ENTERed the first is taken to be the last character The measurement display unit and component name are displayed right justified in fields of three and six characters respectively To left justify or centralise them the appropriate number of spaces can be added at either end of the string Table 5 7 Component name definition t EDIT to obtain window edit menu ENTER PASSWORD To chan
80. ser interface menus only when the relevant hardware is fitted When an automatic calibration is performed then all of the gas sensor modules selected will be calibrated simultaneously The auto calibration process can be initiated in three ways by an internal timer by an external contact closure or by operator request through the user interface Details of each are given in sections 4 10 to 4 12 If any one of these events occurs while the auto calibration cycle is in progress the request will be ignored Touching the keypad during auto calibration will initiate the abort sequence section 4 13 The instrument will only respond to a request for auto calibration from the internal timer or external input if there are no faults indicated Auto calibration can be initiated from the user interface when there is a fault condition If auto calibration or auto check is to be disabled see section 4 11 Disabling auto calibration 4 1 4 2 Recommended calibration check periods It is recommended that the calibration of gas sensor modules is checked at the periods shown in Table 4 1 and recalibration performed if required Table 4 1 Recommended calibration periods gas sensor maawe tow carter Low calibration High calibration uman calibration eene sensor kue 7 I monthl Paramagnetic sensor monthly 4 3 Setting low and high calibration tolerances A limit may be placed on the amount by which a calibration operation may change the st
81. set a dead band so that the alarm does not chatter when the sample concentration level is similar to the alarm level For a high alarm the alarm will be initiated when the sample concentration rises above the alarm level The alarm will be cleared when the sample concentration falls further below the alarm level than the value of hysteresis set ie the hysteresis band sits directly below the alarm level For alow alarm the alarm will be initiated when the sample concentration falls below the alarm level and will be cleared when the sample concentration rises further above the alarm level than the value of hysteresis set ie the hysteresis band sits directly above the alarm level The alarm hysteresis level is specified in terms of the full scale deflection FSD for the transducer concerned The FSD values for the transducers fitted within the xentra 4900 are given in section 1 8 The maximum value of hysteresis is 5 of the FSD Allocation of the alarms to a relay is covered in 5 2 Allocation of relays 5 1 5 2 Table 5 1 Setting up alarms t MENU to obtain top level menu CALIBRATE SETUP rm ENTER ALARMS FAULTS SET ALARM ASSIGN DISPLAY UTILITY ENTER PASSWORD To change the value of a digit 4 or Y 0000 To change to another digit lt or gt When the number shown is correct ENTER SELECT MEASURE t or Y to select required measurement 11 Oxygen T When selected r ENTER 11 Oxygen t gt to select re
82. signal to pin 12 The signal should be applied for a minimum of two seconds NOTE The external autocalibration initiate signal should be applied to pins 11 and 12 of connector PL5 for at least 2 seconds to ensure that the input has been recognised The external range change input is located at pins 13 and 14 of connector PL5 see table 2 4 The second analogue output range for all outputs is obtained by shorting these two pins together or by providing a digital low signal to pin 14 2 9 2 10 WARNING If the external circuits connected to PL1 PL2 PL3 and PL4 are ata voltage exceeding 30 Vrms 42 4 V peak or 60 V dc the following precautions must be observed to prevent an electric shock hazard a The external circuits connected to PL1 PL2 PL3 and PL4 must not be powered with the connector unplugged b The analyser must be mounted in a rack enclosure cabinet or similar fixture and have the external cabling for PL1 PL2 PL3 and PL4 secured as close as practical to the connector This is to prevent strain on the cable pulling the cover from the socket C Fit covers to loose sockets Do not exceed the specified relay rating of 264V rms maximum and 1A maximum CAUTION The current outputs must not be allowed to exceed 30 vrms 42 4vpeak or 60 volt DC to earth when connected to associated equipment NOTE For reliable operation relays should switch not less than 10 mA RELAY CABLING MAY USE EITHER CABLE
83. splaying alarm history x x x x x x K ee 6 5 6 9 Displaying fault history e x cece ee 6 6 6 10 Displaying calibration history 0 x x e lt cee eee 6 6 6 11 Displaying diagnostics information 00 eee eee eee 6 8 SECTION 7 ROUTINE MAINTENANCE 0 220 e eee eee eee 7 1 7 1 Replacing fan filter element x x x x cece eee K eee 7 1 7 2 Replacing sample filter element 00 0 x x eee eee eee 7 1 73 gt Cleaning ioc on dr KK RRR R encore ek ater new ed Chan Ke ee 7 1 SECTION 8 FAULT DIAGNOSIS xx s x x K x eee 8 1 8 1 INGOCUCHON deca cei does ewer die cote E KR R RE R RR oben E 8 1 8 2 Fault diagnosis on the Pm1156 transducer 200e0ee0es 8 1 8 3 Fault diagnosis on the Gfx 1210 transducer 200000es 8 3 8 4 Fault diagnosis with a non functioning display 8 4 SECTION 9 SPARES sc2c ccece tere TR ERE TRER a a ena ee 9 1 91 al TT Spares asistencia ea win tew kaw ale ed ei oa Ww ed aid 9 1 9 2 Spare parts list ici ie teehee teak hee cae oe ee he eee ote 9 1 SECTION 10 APPENDICES amp REVISION HISTORY APPENDIX A MENU MAP oc cece cern Gece Cree OER Gre Ree eee Cesena eee sees A 1 APPENDIX B TECHNICAL DATA SHEET cc crrinbre cere br eare ene Sener ener re tees B 1 APPENDIX C CHARACTER SET cs RRR RRR RRR RRR RRR eine Shae bas eee eae C 1 APPENDIX D EFFECTS OF VARIATIONS IN SAMPLE COMPOSITION D 1 REVISION HISTO
84. support clamp Waisted screw brass M5 Screw M4 Washer M4 Locking washer M4 10 Nut M4 11 12 Screw chrome plated cross head M5 Cup washer plastic If the instrument has been purchased with the rack mounting option then the rack slide inners will already be mounted on the analyser chassis If the rack mounting kit has been purchased as a spare then the instructions in this section detail fitting The rack mounting kit contains two slides item 1 which have an inner and outer section The analyser occupies 3U 5 25 133 mm of rack space Determine at what height the analyser is to be installed in the rack enclosure The analyser will occupy nine rack flange cage nut positions Note that intermediate cage nut positions need not be punched out e Remove the inner section from each slide item 1 and fix one to each side of the chassis using 3 screws item 2 for 4902 models or 4 screws item 2 for 4904 models e Counting from the bottom cage nut position install cage nuts item 4 in positions 1 3 4 and 8 on front two rack enclosure flanges Install cage nuts in positions 1 and 4 on rear two rack enclosure flanges e Insert the two waisted screws item 6 fully into front cage nuts positions 1 and 4 on both front and rear rack enclosure flanges o Present the slide support clamp item 5 behind the rack enclosure front flange and line up with cage nut positions 1 and 4 Engage the two waisted screws item 6 in the s
85. t displayed on the xentra screen will be the component measured by the transducer being calibrated 4 5 4 6 Table 4 4 Gfx sensor low and high calibration t MENU to obtain top level menu CALIBRATE SETUP r ENTER ALARMS FAULTS MANUAL CAL t ENTER AUTOCAL ENTER PASSWORD To change the value of a digit 0000 or v To change to another digit lt or gt When the number shown is correct ts ENTER CALIBRATE To select desired gas sensor IT CO vpmi module 4 or Y then ENTER If only one module is fitted this section will be omitted LOW CAL HIGH CAL HISTORY CHK L amp H 11 LOW TARGET Change the number to the CO 000 00vpm concentration of CO in the calibration gas To change the value of a digit ory To change to another digit lt or gt When the value shown is correct ENTER LT00 00 LC00 04 LT is the target concentration IT CO OK Y N LC is the current concentration eg Introduce low cal gas when the current concentration has stabilised it may be accepted ENTER or rejected ENTER LOW CAL IN PROGRESS Temporary message CAL RESULT The reading following calibration is LT 00 00 LC 00 00 displayed for 1 minute QUIT to obtain next menu LOW CAL HIGH CAL The low point cal is now complete HISTORY CHK L amp H either t MEASURE to go to measurement display or t ENTER to repeat the low point calibration t ENTER to continue with a high point calibration
86. t filter elements 6Um Recommended spares 9 1 9 2 NOTES
87. t using a simple linear factor a of 100 95 1 053 and a quadratic term b of zero 0 00 These should be regarded as the default coefficients when this feature is utilised In more complex combustion processes the user may have available or decide to obtain actual data relating the NO levels to total NOx levels using other measurement methods e g other analysers or wet chemical testing under various operating conditions This data can then be used to derive the practical relationship of NO concentration versus NOx concentration for the process being monitored from which ideal linear and quadratic if necessary terms can be obtained for use by the 4900 using a suitable mathematical software method The procedure for entering the coefficients in the conversion equation is given in Table 5 11 After this has been entered the NOx estimate can be added to the display as a measurand see Section 5 6 and be given an output allocation see Section 5 3 5 13 Table 5 11 Setting the NO conversion parameters t MENU to obtain top level menu CALIBRATE SETUP pe gt ENTER ALARMS FAULTS SET ALARM ASSIGN pe Y gt ENTER DISPLAY UTILITY ENTER PASSWORD To change the value of a digit 4 or Y 0000 To change to another digit lt or gt When the number shown is correct ENTER UTILITY 1 r v ENTER UTILITY 2 UTILITY 2 To select desired gas sensor module or 11 Oxygen 1 Y then ENTER if only one mod
88. the chassis and referring to the technical data sheet included in this manual 2 8 Plug PL5 provides the electrical connections for the analogue inputs the autocalibrate initiate input and the range change input The connection details for PL5 are summarised in Table 2 4 Each analogue input signal consists of an analogue current input for example pins 1 and 2 on PL5 for analogue input 1 plus a digital status input for example pins 9 and 10 on PL5 for analogue input 1 The status input defines the validity of the analogue input signal A high input or open circuit on the digital signal indicates that the data is invalid A low input on the digital signal indicates that the data is valid Connection in this way ensures that disconnection of the analogue input source or removal of the connector from PL5 will result in an invalid measurement indication If no suitable status indication is available from the source of the analogue input signal then the status input pin should be shorted to the neighbouring ground pin within the PL5 connector NOTE If the analogue input status signal is not connected then the digital line will be pulled high internally This indicates that the data is invalid and no reading will be measured The external autocalibrate initiate input is located at pins 11 and 12 of connector PL5 see table 2 4 The autocalibration facility is started by shorting these two pins together or by providing a digital low
89. tic transducer 8 2 Table 8 2 Diagnostic signals for the Pm1156 transducer 8 3 Fault Description Fault diagnosis on the Gfx 1210 transducer Typical level CELL VOLTS Cell output volts 0 1 to 1 2 V CELL TEMP Cell temperature 35 C Range 5 to 70 C Table 8 3 shows a list of the indicated fault conditions for the Gfx 1210 transducer Table 8 3 Fault diagnosis on the Gfx1210 transducer TRANSDUCER NOT RESPONDING SAMPLE FLOW LOW CHOP TEMP LOW or CHOP TEMP HIGH LO V C OUTSIDE TOL or HI V C OUTSIDE TOL Fault indicated Possible causes Recommended action Faulty component Call service engineer Sample flow recorded by optional flow monitor is too low Faulty component User set low or high calibration tolerance has been exceeded during autocalibration Check sample inlet pressure and flow rate Check for blocked sample lines filter or vent pipes If all OK then call service engineer Call service engineer Check that auto calibration gas is not exhausted Increase tolerance if necessary Check that concentration of calibration sample corresponds with concentration specified auto calibration configuration Perform an automatic ONE CY GLE calibration to clear fault If a successful calibration can not be achieved or excessive drift is suspected call service engineer in 8 3 LO V C OUTSIDE RANGE or HI V C OUTSIDE RANGE LO CAL OUTSIDE
90. tions ACCEPT YES NO parameters are correct To change to another selection lt or gt When the value shown is correct ENTER New values are applied to the output port at this time CLOCK NEW PASS To return to measurement display cS COMMS WINDOW MEASURE 5 17 5 18 NOTES SECTION 6 REVIEW 6 1 Introduction to review section This section describes the procedures for reviewing the analyser configuration without changing it The only procedure which requires a password in this section is review of the calibration history 6 2 Displaying alarms present If the measurement display shows the ALARM icon the number and nature of the alarms present may be determined using the procedure described in Table 6 1 Table 6 1 Displaying alarms present t MENU to obtain top level menu CALIBRATE SETUP ALARMS FAULTS DISPLAY ALARMS ALARM HISTORY 11 O2 AL1 99 98 HIGH 1 6 3 Displaying faults present pe Y ENTER The first alarm is displayed if further alarms are present an arrow will be shown e or Y to access information on further alarms When alarms have been viewed amp MEASURE to return to measurement display If the measurement display shows the FAULT icon the number and nature of the faults present may be determined using the procedure described in Table 6 2 Table 6 2 Displaying faults present t MENU to obtain top level menu CALIBRATE SETUP ALARMS FAULTS DISPLAY FAULTS FAULT HISTOR
91. ule is fitted this section will be omitted LOW amp HIGH TOL pe Y ENTER NOx DERIVATION 11 NOx LINEAR Enter the required linear term coefficient a COEF 00 000 Any digit position may be used for the decimal point To change the value of a digit 4 or Y To change to another digit lt or gt When the value shown is correct ENTER 11 NOx SQUARE Enter the required square term coefficient b COEF 00 000 Any digit position may be used for the decimal point To change the value of a digit 4 or Y To change to another digit lt or gt When the value shown is correct ENTER LOW amp HIGH TOL t MEASURE to return to measurement NOx DERIVATION display 5 11 Serial output communications This sections details the configuration of the serial outputs communications via the 9 way D type plug PL6 located on the rear of the instrument The serial output option operates by transmitting a data frame to the RS232 output port at a user defined interval The format of the data frame is a semi colon separated list of process variables terminated by lt carriage return gt lt line feed gt The data frame is time and date stamped An example of the data frame format is given in figure 5 2 The example shows the output from a 4902 instrument configured with a single gas stream fitted with a Gfx1210 CO transducer and a Pm1156 O transducer The format of the process variables is the same as is displayed on the screen includin
92. up to four measurements These screen definitions must then be selected The selected screen definitions may then be scrolled manually by pressing MEASURE or scrolled automatically every ten seconds See Table 5 9 for setting up procedure Table 5 9 Defining and selecting measurement displays t EDIT to obtain window edit menu ENTER PASSWORD To change the value of a digit 4 or Y 0000 To change to another digit lt or gt When the number shown is correct ENTER SELECT SCRN UDEF To define screens v ENTER DEFINE SCRN VARS DEFINE SCREEN t or Y to select the required screen number NUMBER 1 t ENTER SELECT 1ST UDEF t or Y to select the required gas sensor 11 02 1 module t ENTER MORE UDEFS t ENTER to add more measurements to this YES NO screen definition or t ENTER to select another screen for definition When all required screen definitions have been entered ENTER QUIT ENTER to obtain select screens menu SELECT SCRN UDEF To select screens ENTER DEFINE SCRN VARS SELECT ORDER t or Y to select first screen to be displayed 1ST SCREEN IS 1 c ENTER MORE SCREENS t ENTER to select more screen definitions YES NO c K ENTER if no further screens are required AUTOSCROLL t ENTER to select auto scrolling YES NO t K ENTER to select manual scrolling SELECT SCRN UDEF t MEASURE to return to measurement display 5 7 Display resolution The number of decimal places displayed for each
93. ut frame frequency 5 16 Setting the serial output communications parameters 5 17 Displaying alarms present 000c cece eee eens 6 1 Displaying faults present 000 c eee eee ee eee eee 6 1 Displaying relay configuration 000eeeee eee eeee 6 2 Displaying analogue output configuration 6 3 Displaying alarm settings s x x x e lt c x eee e eee eee eee 6 4 Displaying analyser identity 0000e eee eee e eee 6 5 Table 6 7 Table 6 8 Table 6 9 Table 6 10 Table 8 1 Table 8 2 Table 8 3 Table 8 4 Table 8 5 Displaying alarm history 0000e cece eee ee eee 6 6 Displaying fault history 20 cee eee eee eee 6 6 Displaying paramagnetic gas sensor calibration history 6 7 Displaying diagnostic information 200008 6 8 Fault diagnosis on the Pm1156 transducer 8 1 Diagnostic signals for the Pm1156 transducer 8 3 Fault diagnosis on the Gfx1210 transducer 8 3 Diagnostic signals for the Gfx 1210 transducer 8 4 Fault finding with non functioning display 8 5 NOTES SECTION 1 INTRODUCTION 1 1 Introduction This manual contains the essential information regarding installation operation and configuration of the Servomex xentra 4902 and 4904 Continuous Emissions Analysers Complete details of the xentra hardware and full instructions for servicing by qualified perso
94. ve particles exceeding 1 um 5 C 9 F below lowest ambient temperature CAUTION Do not exceed the rated flow or pressure as transducer damage may result This is especially important for paramagnetic transducers NOTE For best performance the flow or pressure supplied to the analyser should be kept at a constant value for both normal sampling and for calibration gas input 2 19 2 11 Calibration gas sample connection If your analyser has the optional internal auto calibration solenoids then the appropriate calibration gases must be connected to the instrument at the appropriate ports on the manifold If no auto calibration manifold is fitted or the external autocalibration option is used then the calibration gases should be connected to the sample gas port by external means These should be delivered to the xentra at the same pressure and flow rate as the sample gas WARNING Internal autocal is unsuitable for use with toxic samples If toxic samples are present the maximum pressure to the analyser must be limited to 5 psig by means of a suitable release system Two calibration mixtures are required to perform the low and high calibrations of the transducers fitted The analyser software may be configured to specify which of the two gases should be used as low gas for each transducer The other will then be the high gas for that transducer It is possible for the low calibration gas mixture of some transducers to functio
95. which the analyser is suitable Pollution degree is concerned with the type of material which may enter the analyser and degrade the electrical insulation The xentra is rated for POLLUTION DEGREE 2 where normally only non conductive pollution occurs Installation category is concerned with the level of over voltage transients experienced on the electrical power supply The xentra is suitable for INSTALLATION CATEGORY II which is characterised as being local level ie not distribution level appliances and portable equipment with over voltage impulse withstand up to 2500 Volts For further guidance see IEC 664 Ambient Operating Conditions Operating Temperature 5 to 45 C 41 to 113 F Storage Temperature 20 to 60 C 4 to 140 F Atmospheric Pressure 79 to 124 kPaa 11 to 18 psia for operating altitudes to 2000m 2 2 Unpacking and Inspection WARNING Xentra 4900 analysers weigh up to 22kg 45Ib and care must be taken when handling It is recommended that they are lifted with both hands positioned on either side of the base of the chassis 2 1 J YW WHEN LIFTING ANALYSER HANDLE VIA UNDERSIDE OF CHASSIS ON EITHER SIDE IN POSITION INDICATED Figure 2 1 Recommended handling The weight of the xentra nominally 20 Kg will vary according to configuration The rack mounting brackets See Figure 2 2 item 1 are not designed to be used as handles or grips When removing the instrument from its packing and for subsequ
96. xygen AL1 HI 10 000 Y N or 1 3 CAL INPROG YES NO or 1 3 FAULT YES NO SELECT RELAY 1 3 ASSIGNED 1 or 1 3 UNASSIGNED 1 pe gt ENTER rs gt ENTER To change the value of a digit 4 or Y To change to another digit lt or gt When the number shown is correct rS ENTER The ASSIGNED and UNASSIGNED informs the user if the relay has been previously assigned t or Y to select the required relay then ENTER EDIT or CLEAR an existing relay assignment or ASSIGN a new one To change to selection lt or gt When correct selection is highlighted then ENTER The display will now show a series of items which may be selected to operate the relay being configured t a ENTER to allocate the item to the relay t ENTER to move to the next item If the item being offered for selection is an alarm the alarm setpoint will be displayed an H or L will also be displayed indicating wether it is configured to be a High or Low alarm t or Y to select another relay then ENTER or t MEASURE to return to measurement Table 5 3 Clearing of relay assignment t MENU to obtain top level menu CALIBRATE SETUP pe gt ENTER ALARMS FAULTS SET ALARM ASSIGN pe gt ENTER DISPLAY UTILITY RELAYS r ENTER ANALOGUE SELECT RELAY t a or Y to select the required relay must 1 3 ASSIGNED 1 already be ASSIGNED then r ENTER or 1 3 UNASSIGNED RELAY ASSIGNMENT ENTER to clear the ass

Xentra 4900 Continuous Emissions Analyser Installation and

Contents

Download Pdf Manuals

Related Search

Related Contents