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Operator`s Manual - GE Measurement & Control

1. B 7 Circuit Board RENO dk he ner baken UP EE A NAE ei reps aeons B 7 Circuit Board Installation EK EE Pr A errre rrn B 8 vi Chapter 1 Calibration Introduction ans ea 1 1 MENU MOB ansehe 1 1 Calibrating the Analog Outputs 1 2 Calibrating the Analog Inputs 1 6 Calibrating the RTD Inputs 1 9 Testing the Alarm Relays 1 11 Testing the Totalizer Frequency Outputs 1 13 April 2008 eee Introduction Calibrating the Model GC868 s analog outputs and inputs is explained in this chapter In addition testing the optional totalizer frequency and alarm relay outputs is discussed The following specific topics are included calibrating the built in Slot 0 analog outputs calibrating optional Slot I through Slot 6 analog outputs calibrating optional Slot 1 through Slot 6 analog inputs testing optional Slot 1 through Slot 6 alarm relays testing optional Slot 1 through Slot 6 totalizer frequency outputs The Model GC868 electronics console includes six expansion slots for the installation of option cards These slots are numbered 1 6 from right to left In addition every Model GC868 flowmeter includes two built in analog outputs A and B at terminal block 1 0 which is designated as Slot 0 Note Convent
2. Fi F2 sar NOTE Plain text represents prompt area messages and STORE ABORT boxed text represents option bar choices 5 Fx represent function keys to select option bar choices Calibration 1 15 Chapter 2 Error Codes and Screen Messages Introduction ass esel 2 1 EO NOE S an ra AS ER 2 2 ET LOW SIGN Gli ir epi oa hb RT ata d aue 2 2 E2 Sound Speed Error Ara eee 2 2 ES Velocity RON a es neh 2 2 EA Signal Quo an res 2 3 ES Amplitude Error msn a e EAE eR At 2 3 Eo Cycle Skip Access A ren a 2 3 EZ Anolog Out Error reci een ae An Ee 2 3 EB Temp Nas 2 3 ES Press In na o ed 2 4 E10 Special Inp t iii Ne 2 4 EITZNOLUSed i dodi ke po hte Pn ebd P tet Et 2 4 ET Not Used SNE 2 4 ETI5S OVer Range ces epe eye ER 2 4 E14 Totals Overflow 193 sss hee oe 2 4 ELS Equation LiMit ae 2 4 EL6 High Signal sa O 2 5 Screen Messdges rore gr en 2 5 April 2008 Introduction The Model GC868 ultrasonic flowmeter is a reliable easy to maintain instrument When properly installed and operated as described in the Startup Guide the meter provides accurate flow rate measurements with minimal user intervention However if a problem should arise with the electronics console the transducers or the flowcell a built in error code message system greatly simplifies the troubleshooting process All of the possible Model GC868 error code messages ar
3. April 2008 Introduction Whenever any service procedure is performed on the Model GC868 flowmeter the details of the service should be recorded in this appendix An accurate service history of the meter can prove very helpful in troubleshooting any future problems Data Entry Record complete and detailed service data for the Model GC868 in Table A 1 below Make additional copies of the table as needed Table A 1 Service Record Description of Service Performed By Service Record A 1 April 2008 A o M Table A 1 Service Record Continued Description of Service Performed By A 2 Service Record April 2008 Diagnostic Parameters After a successful initial installation of the Model GC868 and whenever any system malfunction is noticed the values for the diagnostic parameters should be entered in Table A 2 below Table A 2 Diagnostic Parameters Parameter Initial Current Parameter Initial Current Mw AcVOL StVOL Tup Tdown DELTA PEAK Qup Qdown AMPup AMPdn CNTup CNTdn P up P dn TEMP PRES available availableonlyin Skan Measuremode in Skan Measure mode Service Record A 3 Appendix B Optional Enclosures Introduction ar onn Ree E eh e liner B 1 Rack Mount Enclosure ccena exeo E anne B 1 Rack Mount Fuse
4. 4 Reinstall the black plastic fuse cover and insert the power cord back into the receptacle Then position the power switch in the ON position The Model GC868 flowmeter may now be placed back into service Reconnect the main power and resume taking measurements Note Be sure to record the fuse replacement in Appendix A Service Record B 2 Optional Enclosures April 2008 Rack Mount Option Card The Model GC868 flowmeter can accommodate up to six option Installation cards in a manner similar to that used in a PC The option cards are installed into sockets on the printed circuit board and they are held in place with a metal bracket A single metal bracket is used to secure all the installed option cards Note Jf the Model GC868 presently has no option cards installed be sure to purchase the metal mounting bracket along with the first option card Refer to Figure B 2 on page B 11 and complete the following steps 1 After disconnecting the main power to the meter remove the top panel from the enclosure by removing the four screws indicated WARNING The main power to the Model GC868 must be disconnected before proceeding 2 If one or more option cards are already installed remove the four fasteners that secure the metal bracket to the printed circuit board Lift the metal bracket straight up and away from the printed circuit board Note The fasteners may be either plastic snap rivets or metal hardware
5. 1 Press F3 to TEST the linearity of the currently selected analog output 2 Check the ammeter reading at the 50 output level 3 Then enter a different output level 0 100 and press ENT 4 Check the ammeter reading at this setting and press ENT when done Table 1 1 on page 1 5 lists the expected ammeter readings at various Full Scale settings for both 4 20 mA and 0 20 mA scales Refer to this table to verify the accuracy of the ammeter readings taken above 1 4 Calibration April 2008 Calibrating the Analog Outputs cont Procedure Options Table 1 1 Expected Ammeter Readings Full Scale 4 20 mA Scale 0 20 mA Scale 10 20 30 40 50 60 70 80 90 All ammeter readings should be 0 005 mA If the linearity test readings are not within 5 uA of the values listed in Table 1 1 above check the accuracy and wiring of the ammeter Then repeat the low and high end calibrations If the analog output still does not pass the linearity test contact the factory for assistance You have completed calibration of the analog output Do one of the following To calibrate or test another output press F4 EXIT and return to Step 3 in Accessing the Calibration Menu on page 1 3 To calibrate test additional slots press F4 EXIT twice and proceed to the appropriate section To leave the Calibration Menu press F4 EXIT three times Calibration 1 5
6. April 2008 Calibrating the Analog Inputs Analog inputs may be added to the Model GC868 flowmeter by installing an Analog Inputs Option Card in one or more of the six expansion slots The option card contains two analog inputs which are designated as A and B Each of the inputs which may be either a 0 4 20 mA input or an RTD input must be calibrated at both the zero point and full scale values After calibrating the inputs their linearity should be tested Calibration of the analog inputs requires the use of a calibrated current source If an independent calibrated current source is not available one of the Slot 0 analog outputs may be used for the calibration During the analog input calibration the Slot 0 analog output will supply the low reference high reference 4 mA and 20 mA signals at the appropriate times Note fa Slot 0 analog output is used to calibrate the analog inputs make sure that the Slot 0 analog output calibration procedure has already been completed Connect the Slot 0 analog output s or an independent calibrated current source to the analog input s on the option card as shown in Figure 1 3 below Refer to the menu map in Figure 1 6 on page 1 15 as a guide Analog Input Option Card Terminal Block I O Slot 0 Figure 1 3 Analog Input Calibration Connections 1 6 Calibration Ap
7. R Velocity Range Error E3 2 2 Reboot Automatic 1 1 Replacing See Part Name RTD Option Card Calibrating 1 9 2 Index DECLARATION Sensing OF CONFORMITY We Panametrics Limited Shannon Industrial Estate Shannon County Clare Ireland declare under our sole responsibility that the GC868 Gas Clamp On Ultrasonic Flowmeter to which this declaration relates are in conformity with the following standards e EN 61326 1998 Class A Annex A Continuous Unmonitored Operation e EN 61010 1 1993 A2 1995 Overvoltage Category II Pollution Degree 2 following the provisions of the 89 336 EEC EMC Directive and the 73 23 EEC Low Voltage Directive Shannon June 1 2002 Aaa MAS Mr James Gibson GENERAL MANAGER C SS y I T V ESSEN LS EN 1809002 Shannon ISO 9001 U S CERT DOC HO August 2004 DECLARATION Sensing DE CONFORMITE Nous Panametrics Limited Shannon Industrial Estate Shannon County Clare Ireland d clarons sous notre propre responsabilit que les GC868 Gas Clamp On Ultrasonic Flowmeter r latif cette d claration sont en conformit avec les documents suivants EN 61326 1998 Class A Annex A Continuous Unmonitored Operation e EN 61010 1 1993 A2 1995 Overvoltage Category II Pollution Degree 2 suivant les r gles de la Directive de Compatibilit Electromagnetique 89 336 EEC et de la Directive Basse Tension 73
8. the Service Manual for instructions on properly setting up the meter for accurate flow rate measurements Parts Replacement April 2008 eee Note Be sure to enter a complete and detailed account of the service procedure performed on the Model GC868 in Appendix A Service Record Spare Parts All of the necessary components to upgrade or repair the Model GC868 flowmeter are readily available from the factory As a convenient reference some of the more common spare parts are listed in Table 4 2 below Table 4 2 Spare Parts List Part Number 703 1127 02 Option Card Alarms Hermetically Sealed 703 1127 03 Option Card Alarms General Purpose 703 1442 02 Option Card Analog Inputs 703 1326 02 Option Card Analog Outputs 703 1442 03 Option Card RTD Inputs 703 1144 02 Option Card Totalizer Frequency Outputs 703 1358 Option Card MODBUS 421 703 Card Cage Metal Bracket 417 027 Card Guide Nylon 703 1247 Printed Circuit Board 705 671 LCD Display Assembly 147 744 EPROM 421 700 Conduit Plate 1 2 421 701 Conduit Plate 3 4 421 702 Conduit Plate Blank 421 946 LVD Plastic Shroud 421 686 Main Aluminum Shroud 442 484 Label Wiring Diagram To purchase the parts listed in Table 4 2 above or any items not listed in the table contact the factory for assistance To make sure the proper components are obtained be sure to specify the serial number of the Model GC868 at t
9. 23 EEC Shannon June 1 2002 pu P JP A Mr James Gibson DIRECTEUR G N RAL nsal LS ENISO9002 T V ESSEN Shannon ISO 9001 U S CERT DOC HO August 2004 KONFORMITATS Sensing ERKLARUNG Wir Panametrics Limited Shannon Industrial Estate Shannon County Clare Ireland erkl ren in alleiniger Verantwortung da die Produkte GC868 Gas Clamp On Ultrasonic Flowmeter folgende Normen erf llen EN 61326 1998 Class A Annex A Continuous Unmonitored Operation e EN 61010 1 1993 A2 1995 Overvoltage Category II Pollution Degree 2 gem den Europ ischen Richtlinien Niederspannungsrichtlinie Nr 73 23 EG und EMV Richtlinie Nr 89 336 EG Shannon June 1 2002 pm FE Mr James Gibson GENERALDIREKTOR LS EN IS0 9002 Shannon CERT DOC HO CE e H MI T V ESSEN ISO 9001 U S August 2004 USA 1100 Technology Park Drive Billerica MA 01821 4111 Web www gesensing com Ireland Sensing House Shannon Free Zone East Shannon Co Clare Ireland
10. F2 4 mA Option F3 20 mA Option F4 Procedure Options 1 Enter the low reference value and press the ENT key 2 Press F1 to store the current low reference value or press F2 to cancel the entry In either case the ANALOG INPUT prompt will reappear 3 Press F2 to proceed to the next section 1 Enter the high reference value and press the ENT key 2 Press F1 to store the current high reference value or press F2 to cancel the entry In either case the ANALOG INPUT prompt will reappear 3 Proceed to Procedure Options below 1 Connect the 4 mA current source to the currently selected analog input as shown in Figure 1 3 on page 1 6 2 Press F1 to store the current 4 mA value or press F2 to cancel the entry In either case the ANALOG INPUT prompt reappears 3 Press F4 to proceed to the next section 1 Connect the 20 mA current source to the currently selected analog input as shown in Figure 1 3 on page 1 6 2 Press F1 to store the current 20 mA value or press F2 to cancel the entry In either case the ANALOG INPUT prompt reappears 3 Proceed to Procedure Options below You have completed calibration of the analog output Do one of the following To calibrate another input return to Step 3 in Accessing the Calibration Menu on page 1 7 To calibrate test additional slots press F4 EXIT and proceed to the appropriate section To leave the Calibration Menu pre
11. Model GC868 excessive amounts of solid or liquid particles will absorb or disperse the ultrasound signals This interference with the ultrasound transmissions through the gas will cause inaccurate flow rate measurements In addition temperature gradients in the gas flow may result in erratic or inaccurate flow rate readings 3 4 Diagnostics April 2008 Gas Problems cont Pipe Problems 2 The gas must not excessively attenuate ultrasound signals Some gases i e high purity carbon dioxide hydrogen etc readily absorb ultrasound energy In such a case an E1 error code message will appear on the display screen to indicate that the ultrasonic signal strength is insufficient for reliable measurements The gas sound speed must not vary excessively The Model GC868 will tolerate relatively large changes in the gas sound speed as may be caused by variations in gas composition and or temperature However such changes must occur slowly Rapid fluctuations in the gas sound speed to a value that is considerably different from that programmed into the Model GC868 will result in erratic or inaccurate flow rate readings Refer to Chapter 2 Initial Setup of the Startup Guide and make sure that the appropriate sound speed is programmed into the meter Pipe related problems may result either from a failure to observe the installation instructions as described in the Startup Guide or from improper programming of the meter By fa
12. Model GC868 Rack Mount Enclosure Dimensions ref dwg 712 1076 Optional Enclosures April 2008 EE Line Lead Black Option Card Slot Cover Option Card Socket Neutral Lead White typ Analog Output Connector Fuge RS232 Connector CH1 Transducer Connector CH2 Transducer Connector Ground Lead Green Top Panel Mounting Hole Power Terminal Block 4 places Printed Circuit Board Display Cable Red Lead Snap Rivets typ Option Card Bracket Beveled Corner EY S PCB Mounting Screw typ Black Lead EPROM U4 Figure B 2 Model GC868 Rack Mount Console Assembly ref dwg 1705 849 Backlight Cable Nut amp Washers typ Keypad Cable LCD Display Display Shroud Standoff typ Optional Enclosures B 11 April 2008 Index A D Acceleration Error E6 2 3 Diagnostic Parameters Alarms Option Card Testing 1 11 Table of Values A 3 Amplitude Error ES 2 3 Diagnostic Parameters Table 3 2 Analog Inputs Option Card Calibrating 1 6 Diagnostics Menu Analog Output Error E7 2 3 Enterns u ssh th entente 3 1 Analog Outputs Slot 0 BSR 2e aa setup sendte as 3 4 As Calibrated Current Source 1 6 Display Calibrating 1 2 Cable wiih erty ae STN EG 4 3 Eine rity Ann 1 2 LED ee 4 6 Resolution 1 2 Replacing as
13. Replacement B 2 Rack Mount Option Card Installation B 3 Rack Mount EPROM Replacement B 5 Rack Mount LCD Display Replacement B 6 Rack Mount Printed Circuit Board Replacement B 7 April 2008 mm ee Introduction The Model GC868 is available in optional enclosure types each of which has been designed to permit easy on site upgrades and parts replacement See the foldout drawings at the end of this appendix for details of the applicable GC868 electronics console assembly The instructions in this appendix along with a few common tools are all that is required to perform the following tasks fuse replacement option card installation e EPROM replacement LCD display replacement printed circuit board PCB replacement IMPORTANT For meters supplied in the standard Type 4X enclosure see Chapter 4 Parts Replacement for instructions specific to that unit IWARNING Prior to performing any maintenance procedures disconnect the main power from the unit Note For compliance with the European Union s Low Voltage Directive 73 23 EEC this unit requires an external power disconnect device such as a switch or circuit breaker The disconnect device must be marked as such clearly visible directly accessible and located within 1 8 m 6 ft of the Model GC868 Rack Mount Enclosure R
14. or more of the six expansion slots Each option card contains four analog outputs which are designated as A B C and D Both the zero point and full scale values for each output must be calibrated After calibrating the outputs which have a resolution of 5 0 LA 0 03 full scale their linearity should be tested Note The zero point of the analog output may be set for either 0 mA or 4mA However the calibration procedure always uses the 4 mA point as the meter will extrapolate from this value to obtain the 0 mA point Prepare for the calibration procedure by connecting an ammeter to the desired analog output of Slot X as shown in Figure 1 1 below and Figure 1 2 on page 1 3 Refer to Figure 1 6 on page 1 15 Terminal Block I O Slot 0 B B A A RTN SIG RTN SIG Ammeter Figure 1 1 Ammeter Connection Output A 1 2 Calibration April 2008 o v 7 777 7777 ttssssssssesrv Calibrating the Analog Outputs cont Terminal Block Option Card Ammeter Figure 1 2 Ammeter Connection for Slots 1 6 Output A Accessing the Calibration 1 Press the CAL key to enter the Calibration Program Menu 2 Press Fx to calibrate the desired slot The option bar will include a slot listing for each installed option card 3 Press Fx to select the desired output IMPORTANT The procedure for calibrating all the outputs is the same However when calibrating a different output be sure to reconnect the ammeter to t
15. the display shroud is covered with a piece of black electrical tape This side of the shroud should be over the cables to protect them against abrasion B 6 Optional Enclosures April 2008 Rack Mount LCD Display Replacement cont Rack Mount Printed Circuit Board Replacement Circuit Board Removal 7 Fasten the display shroud to the front panel with the four sets of nuts washers Caution Do not overtighten the nuts or damage to the mounting threads may occur 8 After checking for any loose hardware that may have fallen into the enclosure reinstall the top panel on the meter and secure the panel in place with the four screws previously removed The Model GC868 flowmeter may now be placed back into service Reconnect the main power and resume taking measurements Note Be sure to record the LCD Display replacement in Appendix A Service Record If troubleshooting procedures have indicated a defective printed circuit board follow the instructions in this section to replace the defective board with a new one Refer to Figure B 2 on page B 11 and complete the following steps 1 After disconnecting the main power to the meter remove the top panel from the enclosure by removing the four screws indicated WARNING The main power to the Model GC868 must be disconnected before proceeding 2 Disconnect all external option card connectors at the rear panel of the meter Then remove all installed option cards from t
16. this unit requires an external power disconnect device such as a switch or circuit breaker The disconnect device must be marked as such clearly visible directly accessible and located within 1 8 m 6 ft of the Model GCS amp 68 An aluminum shroud over the printed circuit board shields the electrical components and serves as a location for the wiring diagram label All of the procedures discussed in this chapter except for fuse replacement require removal of this shroud Note For compliance with the European Union s Low Voltage Directive 73 23 EEC a transparent plastic shroud protects the electrical connections The shroud must remain in place except while wiring the unit Reinstall the shroud after the wiring has been completed Use the foldout drawings at the end of this chapter to locate the relevant components while completing the following procedures IMPORTANT Keep a detailed record of all service procedures performed on the Model GC868 in Appendix A Service Record This service history may prove very helpful in diagnosing any future problems Parts Replacement 4 1 April 2008 Fuse Replacement If it has been determined that the fuse in the Model GC868 requires replacement complete the following steps 1 Remove the main power to the electronics console WARNING The main power to the Model GC868 must be disconnected before proceeding Open the cover on the electronics console For LVD compliant
17. until it is fully seated Do not strike the EPROM or apply excessive force during this procedure Complete the EPROM replacement by proceeding to the Installing the Printed Circuit Board section of this chapter page 4 7 4 4 Parts Replacement April 2008 Installing an Option Card The Model GC868 flowmeter can accommodate up to six option cards The option cards are installed into sockets on the bottom of the printed circuit board and they are held in place with a metal bracket A single metal bracket is used to secure all the installed option cards Note Jf the Model GC868 presently has no option cards installed be sure to purchase the metal mounting bracket along with the first option card To install an option card refer to Figure 4 2 on page 4 11 and complete the following steps 1 Remove the printed circuit board as described in a previous section of this chapter 2 If one or more option cards are already installed remove the four fasteners that secure the metal bracket to the printed circuit board Lift the metal bracket straight up and away from the printed circuit board Note The fasteners may be either plastic snap rivets or metal hardware in some older meters In either case they may be discarded as new plastic snap rivets are provided 3 There are six 32 pin option card sockets J41 J46 on the rear of the printed circuit board To install an option card insert its 32 pin connector into any avail
18. GE Sensing amp Inspection Technologies DigitalFlow GC868 Panametrics Gas Clamp On Ultrasonic Flowmeter Service Manual 1 and 2 Channel GE Sensing amp Inspection Technologies DigitalFlow GC868 Panametrics Gas Clamp On Ultrasonic Flowmeter Service Manual 1 and 2 Channel 910 226SF1 April 2008 The DigitalFlow GC868 is a GE Panametrics product GE Panametrics has joined other GE high technology businesses under a new name GE Sensing amp Inspection Technologies April 2008 Warranty Return Policy Each instrument manufactured by GE Sensing Inc is warranted to be free from defects in material and workmanship Liability under this warranty is limited to restoring the instrument to normal operation or replacing the instrument at the sole discretion of GE Fuses and batteries are specifically excluded from any liability This warranty is effective from the date of delivery to the original purchaser If GE determines that the equipment was defective the warranty period is one year for general electronic failures of the instrument one year for mechanical failures of the sensor If GE determines that the equipment was damaged by misuse improper installation the use of unauthorized replacement parts or operating conditions outside the guidelines specified by GE the repairs are not covered under this warranty The warranties set forth herein are exclusive and are in lieu of all other war
19. IT twice 1 14 Calibration April 2008 F1 F2 F3 F4 F1 F2 F3 soto stoti store stots stora stots store Slot x Option Card Slot 0 Outputs Slot x Inputs Analog Inputs Slot x Outputs FA F1 F2 F1 L AJ 8 1 ANALOG OUTPUT ANALOG INPUT Fi F2 F3 F4 Fi F2 F3 F4 F1 F1 F3 4mA 20mA TEST ExT aLOW aHIGH 4mA mA EXIT cLose OPEN EXIT Full Scale LOW REFERENGE HIGH REFERENCE CALIBRATING LOW REF HIGH REF CALIBRATING F2 F3 F4 F1 F1 F2 F1 F2 WN Numer STORE ABORT store Asor STORE BORT Numeric J Slot x Outputs Freq Total Fi F2 a 5 RTD Inputs FREQUENCY FA F2 Probe Numer Slot x Outputs Analog Outputs F1 F2 F3 F4 JE Ce oJ Figure 1 6 Calibration Menu Map PULSES Slot x Inputs ANALOG OUTPUT F1 F2 F3 F4 Ca 4mA 20mA Test ExT Numer Full Scale CALIBRATING Fi F2 Fi F2 F2 F3 F4 Fi Set Slope sew Slot set J LER Down Numer STORE ABORT Set Point Slope Number Numeric Temp Set Point Slope Point
20. O Special ao 0 ar las tss dr N cdi DEN ea ol er i REN 2 4 ET NON ES NT 2 4 ETZ NOU KEEPS 2 4 E13 Over RANGE sa wenn aan kane Miele dinates ba Hp rn er RR Pe CERES ERU 2 4 ER fo ts S N ERE de Dr Pee er EG NE Ek dr Ke fcx 2 4 ES QUATION MT Te 2 4 EG HSA NT 2 5 Screen MESSAGES vald Sn TG 2 5 April 2008 es Table of Contents cont Chapter 3 Diagnostics Hod 3 1 Displaying Biaanostie Parameters c ae sinn uo etti eic ei ann 3 1 DIR OS tic Reed cu oe RP en a a ee iG a el 3 4 BlowcelLPEOBIBITIS is ses ee be se rg bd onde 3 4 Gas Probe sashes ertt ane KARE A RTE MO a RRR S d ds cepe de ile 3 4 ENN SE 3 5 Tord EN ae GR 3 6 Chapter 4 Parts Replacement M een seeren senken 4 1 Fuse REPANT 4 2 Removing the Printed Circuit Boards sera asien ie tek 4 3 REBIGCIHO TNE ERROM or o se e ee tte 4 4 LAS A AT Option eo T MAE tei let A A A Le De Sta 4 5 else arena JE cc 04 orte tu ki iode A 4 6 Installing the Printed Circuit Board oso ono eR pM cdi deh Mia a 4 7 Spare PORS sa sager see Ears ee bed E Pu 4 9 Appendix A Service Record MPA A SG A 1 DAME A A ae edle A 1 Diagnostic ParaMeters 6 corr A 3 Appendix B Optional Enclosures Me B 1 ROCK Med T B 1 Rack Mount Fuse Replacements ses B 2 Rack Mount Option Card Installation vass RS B 3 Rack Mount EPROM Replacement sett dryly Gt Oat glee n da Oat el ee ed cure dreie B 5 Rack Mount LCD Display Replacement die B 6 Rack Mount Printed Circuit Board Replacement
21. Tot K K Re MultiK KFactor Displays the combination of all K factors PEAK PEAK UP Signal Q Displays the percentage of peak set to 80 by default Displays the signal quality for the upstream transducer 400 to 400 DN Signal Q Displays the signal quality for the downstream transducer 400 to 400 UP Amp Discrim Displays the value for the upstream transducer amplitude discriminator lt 19 or gt 29 DN Amp Discrim Displays the value for the down stream amplitude discriminator lt 19 or gt 29 UP DAC Counts Displays the AGC DAC count for upstream gain setting N A DN DAC Counts Displays the AGC DAC count for downstream gain setting N A UP Peak Displays signal peaks for the upstream transducer 100 2 300 lt 100 or gt 2 300 DN Peak Displays signal peaks for the downstream transducer 100 2 300 lt 100 or gt 2 300 Temperature deg F Displays the gas temperature 0 4 20 mA or RTD input N A N A Pressure psia Displays the gas pressure 0 4 20 mA or RTD input N A N A Diagnostics April 2008 Table 3 1 Available Diagnostic Parameters Continued Screen Display SuperC Description Displays supercompressibility as calculated by the NX19 equation or custom table Act Vol KACF MIN Displays actual volumetric flow Std Vol KSCF MIN Displays sta
22. able option card socket and gently press the card into place Make sure that the pins in the connector are straight and properly aligned with the socket and that the connector is positioned on the right side of the option card Caution Do not force the option card into the socket If the card does not enter the socket easily check for and straighten any bent pins in the connector and try again 4 Repeat step 3 to install any additional option cards 5 Place the metal bracket over the option cards making sure that all option cards are aligned with the plastic card guides in the bracket Secure the metal bracket to the printed circuit board with the snap rivets provided See Figure 4 1 on page 4 10 for the installed assembly Complete the option card installation by proceeding to the Installing the Printed Circuit Board section on page 4 7 of this chapter Parts Replacement 4 5 April 2008 Replacing the LCD Display The Model GC868 s measurements are displayed on a a two pane LCD graphic display panel The LCD display normally provides years of dependable service but it is easily field replaceable when necessary To replace the LCD display see Figure 4 1 on page 4 10 for the component locations and complete the following steps 1 Remove the printed circuit board as described in a previous section of this chapter 2 Using a 3 16 nutdriver remove the four nut washer sets that secure the display shroud to the ins
23. d limits is probably caused by the entry of an improper value in the PIPE or SETUP SIGNL submenus of the User Program Using the procedures in Chapter 3 Diagnostics check the components listed above Also check the value programmed into the PIPE or SETUP SIGNL submenu as described in the Operator s Manual The sound speed exceeds the limits programmed in the SETUP SIGNL submenu of the User Program The error may be caused by incorrect programming poor flow conditions wrong transducer spacing or poor coupling Compare the measured sound speed to tabulated nominal values for the fluid being used and correct any programming errors Refer to Chapter 3 Diagnostics to correct any flowcell and or transducer problems The velocity exceeds the limits programmed in the SETUP submenu of the User Program This error may be caused by the entry of improper programming data or by poor flow conditions and or excessive turbulence Make sure the actual flow rate is within the programmed limits See the Programming Manual for details Refer to Chapter 3 Diagnostics to correct any flowcell and or transducer problems Error Codes and Screen Messages April 2008 EEE ern E4 Signal Quality Problem The signal quality is outside the limits programmed in the SETUP submenu of the User Program Cause Too high a signal strength may be caused by the failure of an electronic component Too low a signal strength may be caused by a flowcel
24. de of the enclosure Note fany leads have come loose from the screw terminals on these connectors refer to Appendix C Optional Enclosures of the Startup Guide for wiring instructions 6 Reconnect the main POWER LEADS to the screw terminals at the rear of the printed circuit board When properly installed the lead colors should be green white and black from left to right as viewed from the front of the enclosure 7 Reinstall all option cards as described earlier in this chapter Insert all external option card connectors at the rear panel of the meter 8 After checking for any loose hardware that may have fallen into the enclosure reinstall the top panel on the meter and secure the panel in place with the four screws previously removed The Model GC868 flowmeter may now be placed back into service Reconnect the main power and refer to Chapter 2 Initial Setup of the Startup Guide and Chapter 1 Calibration of this Service Manual for instructions on properly setting up the meter for accurate flow rate measurements Note Be sure to record the printed circuit board replacement in Appendix A Service Record Optional Enclosures B 9 April 2008 14 83 377 16 99 432 ________ 4 19 106 18 70 899 3 31 84 Le AMG Of GC868 18 25 464 19 00 483 Figure B 1
25. e designated as A B C and D To test the outputs connect a frequency counter to the card s terminal block as shown in Figure 1 5 below Refer to the menu map in Figure 1 6 on page 1 15 as a guide Terminal Block Option Card IN Frequency Counter COM Figure 1 5 Frequency Counter Connections For this discussion assume that the option card has been installed in Slot x Accessing the Calibration 1 Menu 2 3 Entering Frequency 4 Press the CAL key to enter the Calibration Program Press Fx to calibrate the desired slot The option bar will include a slot listing for each installed option card Press F1 F4 to select output A B C or D respectively Enter a new frequency in the range of 1 10 000 Hz and press the ENT key Verify that the frequency counter reads the correct value Calibration April 2008 ss Entering Pulse Number 5 Enter the number of pulses desired between I and 10 000 and press the ENT key That number of pulses will then be output at the specified frequency 6 Repeat Steps 3 4 and 5 to test all four of the frequency totalizer outputs If any of the outputs fails to pass the test contact the factory for assistance Procedure Options You have completed testing the totalizer frequency outputs Do one of the following To calibrate test additional slots press F4 EXIT and proceed to the appropriate section To leave the Calibration Menu press F4 EX
26. e discussed in this chapter along with the possible causes and the recommended actions When an error code is generated it will appear on the active pane of the display screen in the location shown in Figure 2 1 below Prompt Area Locator Bar Pointer Velocity 6 95 Ch1 E1 LowSignal Option Bar Error Message Figure 2 1 A Typical Display Screen Note For a 2 Channel Model GC868 the channel number is displayed in front of the error message Only the error message appears with a I Channel Model GC868 If an error message appears on the display screen during operation of the Model GC868 refer to the appropriate section of this chapter for instructions on how to proceed Error Codes and Screen Messages 2 1 April 2008 EO No Error E1 Low Signal E2 Sound Speed Error E3 Velocity Range Problem Cause Action Problem Cause Action Problem Cause Action Problem Cause Action No error condition currently exists This message appears briefly to confirm that the cause for a previous error condition has disappeared has cleared or been resolved No action is required Poor ultrasonic signal strength or the signal exceeds the limits entered via the User Program Poor signal strength may be caused by a defective cable preamplifier or decoupler a flowcell problem a defective transducer or a problem in the electronics console A signal that exceeds the programme
27. ea aoa ea Me anis te 4 6 Analog Outputs Option Card Display Screen Calibrating 1 2 Error Message 2 1 Lanearity sert nee whee sees 1 2 Illustration sus she 2 1 Resolution 1 2 E B EPROM Bracket Option Card 4 5 R placing 2 caged cae 4 4 User Program 4 4 C bror Codes u rt 2 2 Error Message Display Screen 2 1 Cable Expansion Slots anuuaa rnare 1 1 Backlight oeenn ea atte bled 4 3 4 8 Display 4 3 4 6 F Keypad nenn Sa dd 4 3 Calibrating Flowcell Problems See Parameter Name Gas Lua he era nn nud 3 4 Calibration Menu Entering 1 1 Pipe uns ET T 3 5 Circuit Board Fuse See Printed Circuit Board Holder prenisde eras 4 2 Contamination Gas 3 4 Rating esse ra sen 4 2 Corrosion Transducers 3 6 Replacing 4 2 SIZE KE NRT RAD aged Se NATE 4 2 TyDeb aeree ette er CP tee DE E dede tre 4 2 G Gas Contamination 3 4 Physical Requirements 3 4 Problems ges mene 3 4 Soundspeed iecur a ee Z a eee bs 3 5 Grounding Strap 4 7 Guides Option Card 4 5 Index April 2008 Index cont K S Keypad Cable o ua eR 4 3 Screen Messages Table 2 5 Service Record A 1 L Shroud Alum
28. efer to Figure B 1 on page B 10 and Figure B 2 on page B 11 for the location of the relevant components while completing the following procedures If the top panel of the meter is accessible service may be performed without removing the meter from the rack Otherwise disconnect all rear panel electrical connections and remove the meter from the rack before proceeding IMPORTANT Keep a detailed record of all service procedures in Appendix A Service Record This record may prove very helpful in diagnosing any future problems Optional Enclosures B 1 April 2008 Rack Mount Fuse Replacement If it has been determined that the fuse in the Model GC868 requires replacement refer to Figure B 1 on page B 10 and Figure B 2 on page B 11 and complete the following steps 1 On the rear panel of the meter set the power switch to the OFF position and pull the power cord out of its receptacle WARNING The main power to the Model GC868 must be disconnected before proceeding 2 Locate the black plastic fuse cover on the back panel at the bottom of the power cord receptacle and pull it straight out 3 Replace the defective fuse with a new one of the same rating and type Use only 5 x 20 mm Slo Blo fuses having a rating as indicated in Table B 1 below and on the rear panel label Table B 1 Line Voltages amp Fuse Ratings Line Voltage Fuse Rating 100 120 VAC 1 0A Slo Blo 220 240 VAC 0 5 A Slo Blo 12 28 VDC 3 0 A Slo Blo
29. el Model GC868 For example pressing F1 displays the Tdown parameter as shown in the following prompt Ch1 Press the 4 and gt keys and Ch1 DN Transit usec the appropriate Fx key to display a different diagnostic 5 1 9 T parameter or to EXIT the Diagnostics Menu error codes appear here Tdown PREN EA mets Diagnostics 3 1 April 2008 Displaying Diagnostic Parameters cont Table 3 1 below lists the available diagnostic parameters for the Model GC868 The first column in the table shows the parameter as it appears on the option bar while the second column shows the parameter as it appears in the prompt area after it has been selected Table 3 1 Available Diagnostic Parameters Option Bar Screen Display UP Sig Strength Description Displays the signal strength for the upstream transducer lt 58 or gt 68 DN Sig Strength Displays the signal strength for the downstream transducer 58 or gt 68 Soundspeed Ft s Displays the measured sound speed of the fluid N A UP Transit S usec Displays upstream transit time of the ultrasonic signal in microseconds N A DN Transit usec Displays downstream transit time of ultrasonic signal in microseconds N A DeltaT usec REYN Reynolds Displays the difference in usec between upstream and downstream transit times Displays the Reynolds number lt 100 000 000 gt 30 nsec
30. er procedures discussed in this chapter reinstallation of the printed circuit board is the final step in the process Refer to Figure 4 1 on page 4 10 and complete the following steps Caution During this procedure be very careful not to damage the vertical components along the top edge of the printed circuit board see Figure 4 2 on page 4 11 Severe or repeated bending of these components will break their leads 1 Position the printed circuit board within the electronics console with the top edge tilted forward Insert the display ribbon cable and keypad ribbon cable connectors into their sockets on the rear of the printed circuit board See Figure 4 1 on page 4 10 and Figure 4 2 on page 4 11 to identify the cables and sockets Note that the keypad cable connects to the upper socket and the display cable connects to the lower socket IMPORTANT The ribbon cables must be installed with the edges that were marked during removal oriented toward the top of the printed circuit board 2 Carefully position the printed circuit board up against the eight standoffs in the enclosure Do not damage the transformers and any installed option cards as they are maneuvered between the standoffs 3 Loosely install the three long standoffs on the right side of the printed circuit board and the two standoffs or screws along the bottom edge of the printed circuit board Then install only the top and bottom short standoffs on the left side of the prin
31. ere are no sites to print displaying a site there are no sites to display Hit any key to resume taking measurements This message appears upon exiting the User Program if the new site Do you want to SAVE data has not been saved Failure to save will result in loss of the new data next time the site data is changed or recalled Error Codes and Screen Messages 2 5 April 2008 Table 2 1 Screen Messages Continued message Meaning oo Duplicate name Enter another The site file or log name is already in use Enter a different name End Time must exceed Start Time by 5 min This message appears when in the LOG menu Enter an end time that is at least five minutes later than the start time Header invalid An option card error indicating a programming failure or a loss of memory Contact the factory Log Active END only hit any key When in the LOG menu this message indicates that the log is still compiling data Only the End Time may be edited Log DONE to inspect hit any key When in the LOG menu this message indicates that the log is complete Hit any key to display the log Log hasn t started hit key When in the LOG menu this message indicates that the log has not yet started OK settling The measurement has not stabilized Wait before taking a reading Outside limits value rejected When in the CAL menu this message indicates that the calibration of the anal
32. g Diagnostic Parameters This chapter explains how to troubleshoot the Model GC868 if problems arise with the electronics console the flowcell or the transducers Indications of a possible problem include display of an error message on the active display screen erratic flow readings readings of doubtful accuracy i e readings that are not consistent with readings from another flow measuring device connected to the same process If any of the above conditions occurs proceed with the instructions presented in this chapter The Model GC868 has a built in Diagnostics Menu to aid in the troubleshooting of flowcell transducer and or electrical problems The Diagnostics Menu may only be entered from the Big or Dual measurement mode display See Chapter 2 Displaying Data in the Programming Manual for instructions on setting the display screen to the desired format and enter the Diagnostics Menu as shown below 1 For a 2 channel GC868 press the lt or gt keys until the desired channel option appears on the option bar Press the appropriate Fx key to select this option Note For a 1 Channel Model GC868 the above prompt does not appear and the following prompt is the initial screen 2 Press the or gt keys until DIAG appears on the option bar Press the appropriate Fx key to select this option Note Chl or Ch2 which is shown in parentheses above appears in the locator bar only with a 2 Chann
33. ge after the leak has been repaired CORROSION DAMAGE If the transducer material was not properly chosen for the intended application the transducers may suffer corrosion damage The damage usually occurs either at the electrical connector or on the transducer surface If corrosion is suspected remove the transducer from the flowcell and carefully inspect the electrical connector and the transducer surface for roughness and or pitting Any transducer damaged in this manner must be replaced Contact the factory for information on transducers in materials suitable for the application INTERNAL DAMAGE An ultrasonic transducer consists of a ceramic crystal bonded to the transducer case The bond between the crystal and the case or the crystal itself may be damaged by extreme mechanical shock and or temperature extremes Also the internal wiring can be corroded or shorted if contaminants enter the transducer housing PHYSICAL DAMAGE Transducers may be physically damaged by dropping them onto a hard surface or striking them against another object The transducer connector is the most fragile part and is the one most subject to damage Minor damage may be repaired by carefully bending the connector back into shape If the connector cannot be repaired the transducers must be replaced Note Transducers must be replaced in pairs Refer to Chapter 2 Initial Setup of the Startup Guide to program the replacement transducer data int
34. he appropriate pins on terminal block I O Refer to Figure 1 1 on page 1 2 or Figure 1 2 above for correct pin numbers Calibrating the Low End 1 Press F1 to calibrate the low end of the output range of the Output Range 2 Press F1 or F2 to adjust the ammeter reading UP or DOWN until a 4 mA reading is achieved If you press F3 Numer enter a numeric value for the calibration point and press ENT 3 Press F4 to STORE the setting or press gt and F1 to ABORT the calibration Note fthe ammeter reading cannot be adjusted within 5 0 yA of the 4 mA setting contact the factory for assistance Calibration 1 3 April 2008 es Calibrating the High End 1 Press F2 to calibrate the high end of the output range of the Output Range 2 Press F1 or F2 to adjust the ammeter reading UP or DOWN until a 20 mA reading is achieved If you press F3 Numer enter a numeric value for the calibration point and press ENT Note Ifthe ammeter reading cannot be adjusted within 5 0 yA of the 20 mA setting contact the factory for assistance 3 Press F4 to STORE the setting or press gt and F1 to ABORT the calibration Note Skip the next section if the linearity test will not be performed at this time Proceed to Procedure Options on the next page Testing the Analog Output Note If you exited this menu and are returning follow steps 1 Linearity through 3 in Accessing the Calibration Menu on page 1 3
35. he printed circuit board as described earlier in this chapter 3 Disconnect the main POWER LEADS from the screw terminals at the rear of the printed circuit board Make a sketch of the terminal block and the locations of the black white and green power leads to assist in reinstallation of the new circuit board 4 Remove the RS232 ANALOG OUT and TRANSDUCER connectors from the printed circuit board Use a marker to identify pin 1 on the right side keypad side of these connectors Optional Enclosures B 7 April 2008 Circuit Board Removal cont Circuit Board Installation Note These connectors should be pulled straight up and off the printed circuit board DO NOT remove the leads from the screw terminals Remove the flat KEYPAD CABLE connector from terminal J50 near the front of the printed circuit board Mark pin 1 of the cable connector which is located nearer the rear of the enclosure Disconnect the twisted pair DISPLAY BACKLIGHT cable from connector J2 beneath the left side of the printed circuit board Although this connector is polarized it will help to note that the red wire is closer to the rear of the enclosure Remove the flat LCD DISPLAY CABLE connector from terminal J52 near the option card sockets Mark pin 1 of the cable connector which is located nearer the front of the enclosure Using a slotted screwdriver remove the three mounting screws along each side of the printed circu
36. he time of purchase Parts Replacement 4 9 April 2008 Front View Keypad Cable Display Cable Nuts amp Washers 4 places Display Shroud Backlight Cable Cover Ground Wire Internal Ground Connection Fuse Holder Cap Mounting Screw 8 places Main Shroud Main Shroud Nuts amp Washers Display Shroud Option Card Socket LCD Display Matal Bracket Standoffs Fasteners Option Card o em Standoffs typ HIN N i PC Board LVD Shroud Screw 8 places PC Board Power Fuse Holder Ground Wire Connector LVD Shroud Option Cards Side View Card Guide Metal Bracket Bottom View Figure 4 1 Standard Model GC868 Electronics Console Assembly Parts Replacement April 2008 Keypad Cable Backlight Cable LCD Display Display Cable J2 Connector PC Board Ground Wire Short Standoff Vertical Components N 3 places Screws or Standoffs Front View Long Standoff EPROM U4 3 places Keypad Connector J50 Display Connector J52 Fasteners typ Metal Bracket N Option Card Connectors Rear View Figure 4 2 Standard Model GC868 Printed Circuit Board Assembly Parts Replacement Appendix A Service Record Introduction Data Entry Diagnostic Parameters
37. he top panel from the enclosure by removing the four screws indicated WARNING The main power to the Model GC868 must be disconnected before proceeding 2 Using a 3 16 nutdriver remove the four nut washer sets that secure the display shroud to the inside of the front panel Pull the display shroud off its mounting studs 3 Using a 1 4 nutdriver remove the four standoffs that secure the LCD display assembly to the front panel Pull the LCD display assembly off its mounting studs 4 Place the new display in the enclosure and replace the circuit board connections of the data and power cables of the old display with those of the new display Be sure to orient the new cables in the same way as the old ones when making the connections to the printed circuit board Remove and discard the old LCD display 5 Place the new LCD display assembly over the mounting studs on the front panel and fasten it in place with the four standoffs Make sure that the LCD display assembly is oriented with the cables pointing toward the left side away from the keypad of the meter Caution Do not overtighten the standoffs or the display assembly may be damaged 6 Position the LCD display cables between the two mounting studs and install the display shroud over the mounting studs The top and bottom edges of the shroud are bent at a 90 angle to the main surface and these edges must face inwards toward the display assembly Note One edge of
38. ide of the console cover Lift the display shroud off its mounting studs 3 Using a 1 4 nutdriver remove the four standoffs that secure the LCD display assembly to the console cover Lift the LCD display assembly off its mounting studs 4 Place the new LCD display assembly over the mounting studs on the console cover and fasten it in place with the four standoffs Make sure that the LCD display assembly is oriented as shown in Figure 4 2 on page 4 11 Caution Do not overtighten the standoffs or the display assembly may be damaged 5 Position the LCD display cables between the two right side mounting studs and install the display shroud over the mounting studs The top and bottom edges of the shroud are bent at a 90 angle to the main surface and these edges must face inwards toward the display assembly Note One edge of the display shroud is covered with a piece of black electrical tape This side of the shroud should be on the right to protect the cables against abrasion 6 Fasten the display shroud to the console cover with the four sets of nuts washers Caution Do not overtighten the nuts or damage to the mounting threads may occur Complete the LCD Display replacement by proceeding to the Installing the Printed Circuit Board section on page 4 7 4 6 Parts Replacement April 2008 Installing the Printed Circuit Board Whether the printed circuit board was removed for replacement or for one of the oth
39. ill include a slot listing for each installed option card 3 Press F1 F3 to select alarm relay A B or C respectively Calibration 1 11 April 2008 un o O K V CCAAiL EQ E O C I JJKEC S k LUILQGGGGGEEUD IODL 3 Testing the Alarm Relays Note The procedure for testing Alarm Relay A is identical to that for cont testing Alarm Relays B and C However make sure that the ohmmeter is connected to the desired normally open or normally closed contact of the currently selected relay See Figure 1 4 on page 1 11 for the correct pin numbers on the option card terminal block 4 Pressing F1 CLOSE should yield an ohmmeter reading of about zero Pressing F2 OPEN should yield an infinite ohmmeter reading 5 Press F3 to EXIT 6 Repeat the above procedure until both the normally open and normally closed contacts for all three alarm relays have been tested Then proceed to Procedure Options below Procedure Options You have completed testing the alarm relays Do one of the following Tocalibrate test additional slots press F4 EXIT and proceed to the appropriate section To leave the Calibration Menu press F4 EXIT twice 1 12 Calibration April 2008 Testing the Totalizer Totalizer frequency outputs may be added to the Model GC868 by Frequency Outputs installing a Totalizer Frequency Option Card in one or more of the six expansion slots Each option card includes four outputs which ar
40. in some older meters In either case they may be discarded as new plastic snap rivets are provided 3 There are six 32 pin option card sockets J41 J46 on the rear of the printed circuit board By removing the screw on the rear panel remove the appropriate option slot cover to make room for the external connector on the new option card 4 To install the option card insert its 32 pin connector into the chosen option card socket and gently press the card into place Make sure that the pins in the connector are straight and properly aligned with the socket and that the option card is oriented with its external connector positioned in the opening on the rear panel Caution Do not force the option card into the socket If the card does not enter the socket easily check for and straighten any bent pins in the connector and try again 5 Repeat steps 3 and 4 to install any additional option cards Optional Enclosures B 3 April 2008 Rack Mount Option Card Installation cont 6 Place the metal bracket over the option cards making sure that all installed option cards are inserted into the plastic card guides in the bracket The bracket must be oriented so that the six card guides are directly above the six sockets on the printed circuit board do not install the bracket rotated 180 out of position Secure the metal bracket to the printed circuit board with the four plastic snap rivets provided 7 After checking for any lo
41. inum 4 1 4 8 LED Display 23550 nee 4 6 LCD Display on 4 6 Leaks Transducers ae Seg eld eg dalen 3 6 T A ma NE PE 4 8 Low Signal Pror BE ee Rican bade Tv ENE 4 8 LVD Statement 41 o gnal Quality Error E4 2 3 Sockets Option Card 4 5 N Soundspeed No Bror B cose e ERR Ep n 22 Error BZ 2 2 Numer Option for RTD Option Card 1 10 or MT 3 5 Spare Parts List 4 9 O Special Input Error E10 2 4 Option Card T Analog Outputs 1 2 o a Mae 4 5 Temperature Input Error E8 2 3 Expansion Slots j Totalizer Frequency Option Card Testing 1 13 Guides eM LE 4 5 Totals Overflow Error El4 2 2 2000 m Installing ae kea Let eR ER 4 5 Transducers BOCKSIS ed aa dr ke 4 5 Corrosion 3 6 Over Range Error E13 2 4 Internal Damage 3 6 LGAKS ed TR ehe 3 6 p Physical Damage 3 6 Placement us eee dt 3 5 Pipe Problems i eli lv vele 3 6 Measurements oo 3 5 Problems ss severe er pans de 3 5 U Pressure Input Error E9 2 4 Printed Circuit Board User Program EPROM 220 De ie 44 EPROM eese enne d Replacing 4 3 Upgrading 4 4 PROBE Option for RTD Option Card 1 9 Problems Transducers 3 6 V
42. ion in this manual identifies any expansion slot as Slot x where x is a number from 0 6 See Chapter 1 Installation of the Startup Guide for a complete description of the available option cards and the procedures for wiring them Menu Map The Calibration Menu is accessed by pressing the CAL key on the keypad Use this menu to calibrate and test the Slot 0 analog outputs as well as to calibrate and test any option cards that are installed in the expansion slots Refer to the menu map in Figure 1 6 on page 1 15 as a guide in following the calibration instructions Note The same instructions apply to both the 1 Channel and 2 Channel versions of the Model GC868 flowmeter The following discussion assumes that the left screen pane is active If the right screen pane is active only the function key designations change That is replace F1 F4 with F5 F8 Proceed to the appropriate sections of this chapter to calibrate and test all of the installed inputs and or outputs Note While in the Calibration Menu if there is no keypad activity for two minutes the Model GC868 will automatically reboot and return to measurement mode Calibration 1 1 April 2008 Calibrating the Analog Outputs Every Model GC868 flowmeter includes two built in analog outputs A and B at terminal block 1 0 which is designated as Slot 0 Additional analog outputs may be added to the Model GC868 by installing an Analog Outputs Option Card in one
43. it board Carefully lift the printed circuit board out of the enclosure Proceed to the next section for instructions on installing the new printed circuit board Refer to Figure B 2 on page B 11 and complete the following steps 1 Position the new printed circuit board within the electronics console so that it rests on the six standoffs in the base of the enclosure and the option card sockets are located near the rear of the enclosure Secure the circuit board in place with the six screws previously removed Connect the flat LCD DISPLAY CABLE connector to terminal J52 near the option card sockets Make sure the marked pin 1 side of the cable connector is located nearer the front of the enclosure Connect the twisted pair DISPLAY BACKLIGHT cable to connector J2 beneath the left side of the printed circuit board This connector is polarized and can only be installed with the red wire closer to the rear of the enclosure Connect the flat KEYPAD CABLE connector to terminal J50 near the front of the printed circuit board Make sure the marked pin 1 side of the cable connector is located nearer the rear of the enclosure B 8 Optional Enclosures April 2008 Circuit Board Installation 5 Install the RS232 ANALOG OUT and TRANSDUCER connectors onto cont the printed circuit board at the locations indicated in Figure B 2 on page B 11 Make sure the marked pin 1 sides of the connectors face the right side keypad si
44. l or electrical problem Another cause may be a poor signal to noise ratio for the measure mode cycle count technique Action Check for sources of electrical interference and verify the integrity of the electronics console by temporarily substituting a test flowcell that is known to be good Check the transducers and relocate them if necessary See Chapter 3 Diagnostics for instructions E5 Amplitude Error Problem The signal amplitude exceeds the limits programmed in the SETUP submenu of the User Program Cause Excessive levels of an attenuating gas such as CO are present in the pipe Solid or liquid particulates may be present in the pipe The problem could also be caused by excessive turbulence levels or rapid pressure variations Action Refer to Chapter 3 Diagnostics to correct any flowcell problems E6 Cycle Skip Accel Problem The acceleration exceeds the limits programmed in the SETUP submenu of the User Program Cause This condition is usually caused by poor flow conditions or improper transducer spacing Action Refer to Chapter 3 Diagnostics to correct any flowcell and or transducer problems E7 Analog Out Error Problem The current in the analog output circuit exceeds the limits for the analog output port Cause The output load exceeds the specified limits for the analog output port Action Make sure the output load is lt 550 ohms for the Slot 0 analog outputs or is lt 1000 ohms for an analog ou
45. measurements Note Be sure to record the fuse replacement in Appendix A Service Record 4 2 Parts Replacement April 2008 Removing the Printed Circuit Board All of the remaining maintenance procedures discussed in this chapter require removal of the printed circuit board To accomplish this task see Figure 4 1 on page 4 10 and Figure 4 2 on page 4 11 and complete the following 1 Remove the main power to the electronics console WARNING The main power to the Model GC868 must be disconnected before proceeding 2 Open the electronics console For LVD compliant units remove the two mounting screws and lift the clear plastic shroud out of the electronics console Remove the six mounting screws and lift the main aluminum shroud out of the electronics console 3 Disconnect the main power leads and the PC board ground wire from terminal block TB1 on the printed circuit board Remove the electrical connectors from all installed option cards and terminal blocks Disconnect the twisted pair display backlight cable from connector J2 on the left side of the printed circuit board 4 Using a 3 8 in nutdriver or open end wrench remove the three short standoffs along the left side of the main circuit board and the three long standoffs along the right side of the main circuit board 5 While supporting the printed circuit board remove the two screws or standoffs along the bottom edge of the printed circuit board Note Fo
46. ndard volumetric flow if STANDARD equation is used UP Transit S usec Displays Skan Tup DN Transit S usec Displays Skan Tdn DeltaT S usec Displays Skan DELTA UP Transit M usec Displays Measure Tup DN Transit M usec Displays Measure Tdn DeltaT M usec Displays Measure Delta Skan T Offset usec Displays dynamically calculated signal timing offset in the skan signal measurement Vinst Ft s Displays the instantaneous velocity for comparison with Vel without averaging Theta 3 degrees Displays the angle of the ultrasonic signal inside the pipe CEE1 Displays the speed of sound in the transducer clamp on only UP Signal noise Displays the signal noise ratio for the upstream transducer DN Signal noise Displays the signal noise ratio for the downstream transducer SkanDT MeasDT Displays the difference between the Skan Delta T and Measure Delta T values Last parameter Leave the Diagnostics Menu These options are available only in the Skan Measure mode Diagnostics 3 3 April 2008 es Diagnostic Record Upon leaving the Diagnostic Menu via the EXIT key or the EXIT option on the option bar the display screen will continue to show the last diagnostic parameter that was selected To return to normal measurement mode select a channel to display for a 2 Channel meter only and then select the desi
47. nt 3 Enter the set point temperature and press ENT 4 The program then asks for the set point number Enter the points measured at the set temperature and press ENT Slope Number 5 Press F2 to enter the slope number Calculate the slope number with the formula Slope point set point 1 1 Slope slope temp set temp 6 Enter the RTD slope number and press ENT Procedure Options You have completed calibration of the RTD input Do one of the following To calibrate another input press EXIT To calibrate additional slots press EXIT and then F4 EXIT and proceed to the appropriate section To leave the Calibration Menu press F4 EXIT twice 1 10 Calibration April 2008 Testing the Alarm Relays Alarm relays may be added to the Model GC868 by installing an Alarms Option Card in one or more of the six expansion slots Each option card includes three alarm relays which are designated as A B and C To test the alarm relays connect an ohmmeter to the option card terminal block as shown in Figure 1 4 below Refer to the menu map in Figure 1 6 on page 1 15 as a guide Terminal Block Option Card Ohmmeter Figure 1 4 Typical Ohmmeter Connections For this discussion assume that the option card has been installed in Slot x Accessing the Calibration 1 Press the CAL key to enter the Calibration Program Menu 2 Press Fx to calibrate the desired slot The option bar w
48. o STORE the entered temperature or F2 to ABORT the calibration In either case the screen returns to the ANALOG INPUT prompt 7 Press F2 to enter the slope point temperature This temperature should be as far from your set point as your temperature bath will allow within the range 100 to 350 C 148 to 592 F 8 Enter the desired slope point temperature and press ENT 9 Press F1 to STORE the entered temperature or F2 to ABORT the calibration In either case the screen returns to the ANALOG INPUT prompt 10 Proceed to Procedure Options on the next page Calibration 1 9 April 2008 es Numer Option F2 The Numer option allows the user to calculate the temperature vs resistance information To do this the user must first collect data using the RTDs option in the PRINT menu discussed in Chapter 5 of the Programming Manual The RTDs option allows you to know what point value the GC868 is reading at a given temperature With this information the Numer option enables you to enter the Set Temperature and the slope of the RTD input in points degree allowing absolute control over RTD calibration Before attempting this step follow the instructions in Chapter 5 of the Programming Manual The RTDs Submenu to obtain point values at your set point and slope point 1 Press F1 to select Input A or F2 to select Input B Set Number 2 Press F1 to enter the set number formerly known as the zero poi
49. o the meter If the instructions in this section fail to resolve the problem contact the factory for assistance Diagnostics Chapter 4 Parts Replacement Introduction sea ha Bale ee a 4 1 Fuse Replacement ao AEG 4 2 Removing the Printed Circuit Board 4 3 Replacing the EPROM su re eier 4 4 Installing an Option Card 4 5 Replacing the LCD Display 4 6 Installing the Printed Circuit Board 4 7 Spare Pass vars a P 4 9 April 2008 Em ee Introduction The electronics console of the Model GC868 has been designed to permit easy on site upgrades and parts replacement See Figure 4 1 on page 4 10 and Figure 4 2 on page 4 11 for details of the standard GC868 electronics console assembly The instructions in this chapter along with a few common tools are all that is required to perform the following tasks fuse replacement printed circuit board PCB removal and installation e EPROM replacement option card installation LCD display replacement IMPORTANT For meters supplied in any of the optional enclosure types see Appendix B Optional Enclosures for instructions specific to that unit WARNING Prior to performing any maintenance procedures be sure to disconnect the main power from the unit Note For compliance with the European Union s Low Voltage Directive 73 23 EEC
50. og output is invalid Hit any key to clear the message and the GC868 will default to the last valid calibration The message will also appear if there is no ammeter connected to the analog output during calibration Overflow The display value overflowed Reduce the number of decimal digits or change the units P lt L Enter L again The entered path length P is less than the axial dimension L Enter a new value for L range IS X XX to X XX When in the User Program this message indicates that the entered number is unacceptable Hit any key and enter a number within the allowable range Review calibration An option card error indicating a programming failure or a loss of memory Contact the factory Review parameters An option card error indicating a programming failure or a loss of memory Contact the factory Starting time must exceed current time This message appears when in the LOG menu STD option Enter a start time that is later than the current time Write error An option card error indicating a programming failure or a loss of memory Contact the factory 2 6 Error Codes and Screen Messages Chapter 3 Diagnostics Introduction ns ia 3 1 Displaying Diagnostic Parameters 3 1 Diagnostic Record va ar ee 3 4 FloweelliProblems une er ene e ees 3 4 Transducer Problems e ee hh hh tnn 3 6 April 2008 Introduction Displayin
51. or bar messages are discussed in detail in Chapter 3 Operation of the Startup Guide they will not be repeated here All other messages are listed in Table 2 1 below Table 2 1 Screen Messages Fel R Power Up Messages Backup Battery FAIL The backup battery that powers the non volatile RAM has failed Contact the factory Backup Battery OK The backup battery that powers the non volatile RAM has passed EPROM sum XXXX Record the EPROM sum at the initial power up and periodically thereafter FRIGID_INIT Executed The NVR non volatile RAM was automatically initialized due to a memory fault Contact the factory NVR FAIL The non volatile RAM has failed Contact the factory NVR OK The non volatile RAM has passed Measurement Mode Messages This message may appear during one of the following tasks 1 clearing a log there are no more logs to clear 2 logging data user has hit ENT instead of selecting an old log or All Logs Cleared hit key entering a new name 3 printing a log there are no logs to print 4 displaying a log there are no logs to display Hit any key to resume taking measurements This message may appear during one of the following tasks 1 saving a new site a new site name was not entered or overwrite existing site was not selected All Sites Cleared hit key recalling a site there are no site files to recall clearing a site there are no sites to delete printing a site th
52. ose hardware that may have fallen into the enclosure reinstall the top panel on the meter and secure the panel in place with the four screws previously removed The Model GC868 flowmeter may now be placed back into service Reconnect the main power and refer to Appendix C Optional Enclosures of the Startup Guide for instructions on wiring the new option card s Note Be sure to record the option card installation in Appendix A Service Record B 4 Optional Enclosures April 2008 Rack Mount EPROM The Model GC868 s User Program is stored on an erasable Replacement programmable read only memory EPROM chip The EPROM which is designated as component U4 is located on the corner of the printed circuit board just behind the keypad on the front panel EPROM replacement may be required to replace a defective chip or to upgrade to a newer software version To replace the EPROM refer to Figure B 2 on page B 11 and complete the following steps 1 After disconnecting the main power to the meter remove the top panel from the enclosure by removing the four screws indicated IWARNING The main power to the Model GC868 must be disconnected before proceeding 2 Using a chip puller remove the EPROM from its socket If a chip puller is unavailable a straightened paper clip may be used in the notches at opposite corne
53. r the most common pipe problems are the following 1 The collection of material at the transducer location s Accumulated debris at the transducer location s will interfere with transmission of the ultrasound signals As a result accurate flow rate measurements are not possible Realignment of the flowcell or transducers often cures such problems Refer to Chapter 1 Installation of the Startup Guide for more details on proper installation practices Inaccurate pipe measurements The accuracy of the flow rate measurements is no better than the accuracy of the programmed pipe dimensions For a flowcell supplied by GE the correct data will be included in the documentation For other flowcells measure the pipe wall thickness and diameter with the same accuracy desired in the flow rate readings Also check the pipe for dents eccentricity weld deformity straightness and other factors that may cause inaccurate readings Refer to Chapter 2 Initial Setup of the Startup Guide for instructions on programming the pipe data Diagnostics 3 5 April 2008 Transducer Problems Ultrasonic transducers are rugged reliable devices However they are subject to physical damage from mishandling and chemical corrosion The most common transducer problems are listed below 1 LEAKS Leaks may occur around the transducer Repair such leaks immediately If the leaking gas is corrosive carefully check the transducer and cables for dama
54. r an LVD compliant meter with the clear plastic shroud over the electrical connectors there will be standoffs in these two locations For meters not equipped with this shroud there will be Phillips head screws in these two locations Caution During this procedure be very careful not to damage the upright components along the top edge of the printed circuit board see Figure 4 2 on page 4 11 Severe or repeated bending of these components will break their leads 6 On newer units unscrew the green grounding strap from its location between the fuse holder and power terminal block taking care not to lose the attached washer and nut 7 Carefully lift the printed circuit board out of the enclosure Continue to support the printed circuit board as the keypad and display cables are still connected to the bottom of the board Parts Replacement 4 3 April 2008 Removing the Printed Circuit Board cont Replacing the EPROM 8 Tilt the top of the printed circuit board forward and mark the top edges of the two ribbon cable connectors Then remove these cables from their connectors on the rear of the board 9 The printed circuit board is now free and may be removed to a clean work area If the printed circuit board is being replaced proceed to the section on Installing the Printed Circuit Board page 4 7 now Otherwise refer to the appropriate section for instructions on Installing an Option Card page 4 5 Replacing
55. ranties whether statutory express or implied including warranties of merchantability and fitness for a particular purpose and warranties arising from course of dealing or usage or trade If a GE Sensing Inc instrument malfunctions within the warranty period the following procedure must be completed 1 Notify GE giving full details of the problem and provide the model number and serial number of the instrument If the nature of the problem indicates the need for factory service GE will issue a RETURN AUTHORIZATION number RA and shipping instructions for the return of the instrument to a service center will be provided 2 If GE instructs you to send your instrument to a service center it must be shipped prepaid to the authorized repair station indicated in the shipping instructions 3 Upon receipt GE will evaluate the instrument to determine the cause of the malfunction Then one of the following courses of action will then be taken e If the damage is covered under the terms of the warranty the instrument will be repaired at no cost to the owner and returned f GE determines that the damage is not covered under the terms of the warranty or if the warranty has expired an estimate for the cost of the repairs at standard rates will be provided Upon receipt of the owner s approval to proceed the instrument will be repaired and returned lii April 2008 Poo ooo es Table of Contents Chapter 1 Calib
56. ration Hedda 1 1 Menu Map ee Rand ter utere rs D c da dan Maret ee 1 1 Calibrating the Ahgloq OUTpulss oes e ELA o C RE HET e OU Hat tu VR CERCA RR 1 2 Accessing the Calibration MENU eus oor Iob tem Pero dan DADOS Ie bee LEGE 1 3 Calibrating the Low End OPS OULDUE ROMO cx SN ASS 1 3 Calibrating the High End of the Output Rangers a a 1 4 Testing the Analog Output Dini dl ity eot eid ect ee ES 1 4 cabaret Sa 1 6 A c ssing the Calibration Mendin ct a ent eaten an Mae ae Lenger 1 7 AMG NE 1 8 RENSES lassen Ned 1 8 O ll ME EE ee ren 1 8 MENN NRT Cee Na rg 1 8 Calibrating The TOA a N Slee Eu A ROL ghd Tae 1 9 ACCessing the Calibration Mental 1 9 Provee pon FINT 1 9 Ea o Flau IA OA 1 10 Testing the A SS 1 11 Accessing the Calibration MENU Lesser ea 1 11 Testing the Totalizer Frequency OUPUls Jaer diet pide etd 1 13 Accessing the CaliBRatioriMenti m GS ERU EET ad 1 13 Ent riIng FREQUEN GE Werte a ae a e OS e DRM UE 1 13 Entering Pulse NT DE NN 1 14 Chapter 2 Error Codes and Screen Messages Mo NST 2 1 ORINAR g KO AE See eee 2 2 NS e NE 2 2 E2 Sound Speed BIEOR n o ed Aa a ht et oe A e uda 2 2 EVEN RINGE A Robin edd RH ee 2 2 E4 Signal Qudt gt eos ri ped 2 3 EBAmplibIde FO Jaaa Fe ASA ERE e LA SPERO ELA A OO dele saker SUR 2 3 BOY SKID ACCE EN ra eee NS CECE e Same TEE a Oen 2 3 EZ Andog COU Ged dg pcre EN a ad id 2 3 BOP TEMPUS sider turin Sor Se Serre PUE elis See tran Sedlene fraser 2 3 E9 Pres N a bee ae 2 4 EL
57. red display parameter See Chapter 3 Operation of the Startup Guide for detailed instructions The values for the diagnostic parameters immediately after initial installation of the meter and verification of proper operation should be entered in Table A 2 on page A 3 These values can then be compared to future values to help diagnose any future malfunction of the system Flowcell Problems If preliminary troubleshooting with the Error Code Messages and or the Diagnostic Menu indicates a possible flowcell problem proceed with this section Flowcell problems fall into two categories gas problems pipe problems Read the following sections carefully to determine if the problem is indeed related to the flowcell If the instructions in this section fail to resolve the problem contact the factory for assistance Gas Problems Most gas related problems result from a failure to observe the flowmeter system installation instructions as described in the Startup Guide Refer to Chapter 1 Installation of the Startup Guide to correct any installation problems If the physical installation of the system meets the recommended specifications it is possible that the gas itself may be preventing accurate flow rate measurements The gas being measured must meet the following requirements 1 The gas must be homogeneous single phase and relatively clean Although a low level of entrained particles may have little effect on the operation of the
58. ril 2008 Calibrating the Analog Inputs cont Accessing the Calibration Menu For this discussion assume that the option card has been installed in Slot x Note The zero point of the analog input may be set for either 0 mA or 4 mA However the calibration procedure always uses the 4 mA point as the meter will extrapolate from this value to obtain the 0 mA point 1 Press the CAL key to enter the Calibration Program 2 Press Fx to calibrate the desired slot The option bar will include a slot listing for each installed option card 3 Press Fx to select the desired input The procedure for calibrating Input A is identical to that for calibrating Input B However when calibrating Input B be sure a calibrated current source is connected to the appropriate pins on the terminal block See Figure 1 3 on page 1 6 for the correct pin numbers To calibrate a 0 4 20 mA input card see the section below Note 7o calibrate an RTD input card refer to page 1 9 4 Press F1 F4 to select the reference point to be calibrated Do one of the following If you selected F1 aLOW proceed to aLOW Option on the next page If you selected F2 aHIGH proceed to aHIGH Option on the next page If you selected F3 4 mA proceed to 4 mA Option on the next page If you selected F4 20 mA proceed to 20 mA Option on the next page Calibration 1 7 April 2008 aLOW Option F1 aHIGH Option
59. round wire to terminal block TB1 on the printed circuit board Plug all other electrical connectors into the appropriate sockets on the printed circuit board and option cards See Chapter 1 Installation of the Startup Guide for instructions on proper wiring of the Model GC868 Note For an LVD compliant meter with the clear plastic shroud over the electrical connectors there will be standoffs in the two mounting locations along the bottom edge of the printed circuit board For meters not equipped with this shroud there will be Phillips head screws in these two locations For LVD compliant units position the clear plastic LVD shroud over the electrical connections so that the two holes in the shroud align with the standoffs on the printed circuit board Secure the shroud to the standoffs with the two sets of screws and washers 10 After carefully checking for and removing any loose hardware in the enclosure close the electronics console and reconnect the main power to the Model GC868 Note For compliance with the European Union s Low Voltage Directive 73 23 EEC this unit requires an external power disconnect device such as a switch or circuit breaker The disconnect device must be marked as such clearly visible directly accessible and located within 1 8 m 6 ft of the Model GC868 Before taking measurements with the Model GC868 refer to Chapter 2 Initial Setup of the Startup Guide and Chapter 1 Calibration of
60. rs of the socket Gently pry the EPROM up a little at a time at each notch until it comes free Caution The EPROM is easily damaged by static electricity Before handling the new chip touch a grounded metal object to discharge any built up static electricity and avoid touching the leads on the side of the chip 3 Make sure that the beveled corner on the new EPROM is aligned with the beveled corner of the socket and place the EPROM into the socket 4 By applying equal pressure on all four corners gently press the EPROM into the socket until it is fully seated Do not strike the EPROM or apply excessive force during this procedure 5 After checking for any loose hardware that may have fallen into the enclosure reinstall the top panel on the meter and secure the panel in place with the four screws previously removed The Model GC868 flowmeter may now be placed back into service Reconnect the main power and resume taking measurements Note Be sure to record the EPROM replacement in Appendix A Service Record Optional Enclosures B 5 April 2008 Rack Mount LCD Display The Model GC868 measurements are displayed on a two pane LCD Replacement graphic display panel The LCD display normally provides years of dependable service but it is field replaceable when necessary To replace the LCD display refer to Figure B 2 on page B 11 and complete the following steps 1 After disconnecting the main power to the meter remove t
61. ss F4 EXIT twice 1 8 Calibration April 2008 Calibrating the RTD Inputs Accessing the Calibration Menu Probe Option F1 Set Point Temperature Slope Point Temperature Calibrating an RTD option card involves a different procedure than for other analog input cards However you access the card in the same manner as other cards 1 Press the CAL key to enter the Calibration Program 2 Press Fx to calibrate the desired slot The option bar will include a slot listing for each installed option card If you have installed an RTD option card the following screen appears CALIBRATION Press F1 to select the Probe Slot x Inputs method of calibration or F2 to current input selected select the numeric method RTD CALIBRAT last option selected Probe Numer The Probe option allows the meter to calculate the temperature vs resistance curve based on input from the RTD in a temperature bath or from an RTD calibrator The Numer option forces the user to calculate and input the curve values numerically IMPORTANT Use only one option for RTD calibration Do not try to calibrate with both options 3 Press F1 to select Input A or F2 to select Input B 4 Press F1 to enter the set point temperature formerly known as the zero point This temperature should be at the low end of your expected operating range 5 Enter the desired set point temperature and press ENT 6 Press F1 t
62. ted circuit board 4 Insert the free end of the green grounding strap between the printed circuit board and the middle standoff beneath the left side of the board Making sure to capture the grounding strap lug between the printed circuit board and the standoff beneath it install the remaining short standoff on the left side of the printed circuit board Securely tighten all eight standoffs and or screws IMPORTANT Correctly installing the grounding strap may require some patience but resist the temptation to place the grounding strap on top of the printed circuit board On newer units screw the grounding strap into its hole between the fuse holder and the power terminal block with the screw washer and nut Parts Replacement 4 7 April 2008 Installing the Printed Circuit Board cont Connect the twisted pair backlight cable to socket J2 on the left edge of the printed circuit board This plug is polarized so that it can only be installed in the proper orientation with the black wire above the red wire Check for and remove any loose hardware that may have fallen into the electronics console during the maintenance procedure Place the main shroud over the six upper standoffs on the printed circuit board Making sure that the shroud is oriented with the wiring diagram label upright fasten the shroud to the standoffs with the six sets of screws and washers Reconnect the power line wires and the PC board g
63. the EPROM below or Replacing the LCD Display page 4 6 The Model GC868 s User Program is stored on an erasable programmable read only memory EPROM chip The EPROM designated as component U4 is located in the top left corner of the bottom of the printed circuit board See Figure 4 2 on page 4 11 fora rear view of the printed circuit board EPROM replacement may be required to replace a defective chip or to upgrade to a newer software version To replace the EPROM complete the following steps 1 Remove the printed circuit board as described in a previous section of this chapter 2 Place the printed circuit board face down on a clean flat surface Locate the EPROM socket at the top left corner of the board Caution The EPROM is easily damaged by static electricity Before handling the new chip touch a grounded metal object to discharge any built up static electricity and avoid touching the leads on the side of the chip 3 Using a chip puller remove the EPROM from its socket If a chip puller is unavailable a straightened paper clip may be used in the notches at the upper right and lower left corners of the socket Gently pry the EPROM up a little at a time at each notch until it comes free 4 Make sure that the beveled corner on the new EPROM is aligned with the beveled corner of the socket and place the EPROM into the socket 5 By applying equal pressure on all four corners gently press the EPROM into the socket
64. thematical overflow has occurred in either the volumetric or mass flow calculations Select larger measurement units or a shorter time interval for the current measurement parameter For example choose KSCF M instead of SCF M See the Startup Guide for instructions The totalizers are unable to keep up with the total flow signals The programmed units pulse value is too small Select a larger number of units pulse value The steam measurement may not be within 1 accuracy The temperature or pressure reading is outside the accuracy specification of the GC868 steam equations Adjust the pressure reading to within the range of 139 9685 kPa to 2242 9435 kPa 20 8717 to 326 4482 psi or the temperature reading to within the range of 373 1500 K to 810 9278 K 100 to 212 F 2 4 Error Codes and Screen Messages April 2008 E16 High Signal Problem The meter signal strength exceeds the limits entered via the User Program Cause A signal that exceeds the programmed limits is probably caused by the entry of an improper value in the TRANSDUCER or PIPE submenu of the User Program Action Check the values programmed into the TRANSDUCER and PIPE submenus as described in the Startup Guide and the Programming Manual Bypass or remove the preamp Screen Messages A variety of messages may appear on the display screen during the performance of a task Since the error codes have already been discussed in this chapter and the locat
65. tputs option card slots 1 6 E8 Temp In Problem This message indicates a temperature input error Cause The temperature exceeds the specified limits for the analog inputs option card Action Check the temperature transmitter and the connecting cable Refer to Chapter 1 Calibration and recalibrate the analog inputs on the option card Error Codes and Screen Messages 2 3 April 2008 E9 Press In E10 Special Input E11 Not Used E12 Not Used E13 Over Range E14 Totals Overflow E15 Equation Limit Problem Cause Action Problem Cause Action This message indicates a pressure input error The pressure exceeds the specified limits for the analog inputs option card Check the pressure transmitter and the connecting cable Refer to Chapter 1 Calibration and recalibrate the analog inputs on the option card This message indicates a special input error The special input exceeds the specified limits for the analog inputs option card Check the special transmitter and the connecting cable Refer to Chapter 1 Calibration and recalibrate the analog inputs on the option card This error code message is not currently in use This error code message is not currently in use Problem Cause Action Problem Cause Action Problem Cause Action This error code message indicates that the present measurement exceeds the capacity of the meter An internal ma
66. units remove the two mounting screws and lift the clear plastic shroud out of the electronics console Locate the black plastic fuse holder that is mounted on the printed circuit board between the power terminal block TB1 and the RS232 terminal block As shown in Figure 4 1 on page 4 10 the fuse holder extends below the main aluminum shroud and the fuse holder cap is located on the bottom of the fuse holder Using a small standard screwdriver turn the fuse holder cap counterclockwise about 1 4 turn The fuse holder cap with the captive fuse will be ejected from the fuse holder Replace the defective fuse with a new one of the same rating and type Use only 1 1 4 x 1 4 Slo Blo fuses having a rating as indicated in Table 4 1 below and on the wiring diagram label Table 4 1 Line Voltages amp Fuse Ratings Line Voltage Fuse Rating 100 120 VAC 1 0A Slo Blo 220 240 VAC 0 5 A Slo Blo 12 28 VDC 3 0 A Slo Blo Press the new fuse into the fuse holder cap and insert the fuse into the fuse holder While applying a slight pressure with the screwdriver twist the fuse holder cap 1 4 turn clockwise For LVD compliant units place the clear plastic shroud over the standoffs in the electronics console and secure it in place with its two mounting screws Close the cover on the electronics console The Model GC868 flowmeter may now be placed back into service Reconnect the main power and resume taking

Operator`s Manual - GE Measurement & Control

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Operator`s Manual - GE Measurement &amp; Control

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Operator`s Manual - GE Measurement & Control