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Copyright 2021 Baker Hughes company.
This material contains one or more registered trademarks of Baker Hughes Company and its subsidiaries

in one or more countries. All third-party product and company names are trademarks of their respective

holders.

DigitalFlow™ GM868

Panametrics Multipurpose Ultrasonic Gas Flowmeter

Service Manual

910-193S Rev. F

Jul 2021

Summary of Contents for DigitalFlow GM868

Page 1: ...panametrics com Flow 910 193S Rev F Jul 2021 DigitalFlow GM868 Panametrics Multipurpose Ultrasonic Gas Flowmeter Service Manual...

Page 2: ......

Page 3: ...ore registered trademarks of Baker Hughes Company and its subsidiaries in one or more countries All third party product and company names are trademarks of their respective holders DigitalFlow GM868 P...

Page 4: ...ii no content intended for this page...

Page 5: ...if it is not avoided CAUTION Indicates a potentially hazardous situation which can result in minor or moderate injury to personnel or damage to the equipment if it is not avoided HIGH VOLTAGE This sym...

Page 6: ...ou bought has required the extraction and use of natural resources for its production It may contain hazardous substances that could impact health and the environment In order to avoid the disseminati...

Page 7: ...r Frequency Outputs 13 1 8 1 Accessing the Calibration Menu 13 1 8 2 Entering Frequency 13 1 8 3 Entering Pulse Number 14 Chapter 2 Error Codes and Screen Messages 2 1 Introduction 17 2 2 E0 No Error...

Page 8: ...A Service Record A 1 Introduction 41 A 2 Data Entry 41 Appendix B Optional Enclosures B 1 Introduction 43 B 2 Rack Mount Enclosure 43 B 3 Rack Mount Fuse Replacement 44 B 4 Rack Mount Option Card Ins...

Page 9: ...DigitalFlow GM868 Service Manual vii Contents...

Page 10: ...Contents viii DigitalFlow GM868 Service Manual...

Page 11: ...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 1 2 Menu Map The Calibration Menu is access...

Page 12: ...ale values for each output must be calibrated After calibrating the outputs which have a resolution of 5 0 A 0 03 full scale their linearity should be tested Note The zero point of the analog output m...

Page 13: ...Service Manual 3 Chapter 1 Calibration 1 3 Calibrating the Analog Outputs cont Figure 2 Ammeter Connection for Slots 1 6 Output A Terminal Block Option Card A SIG A RTN B SIG B RTN D SIG D RTN C SIG...

Page 14: ...tance 1 4 2 Calibrating the High End of the Output Range 1 Press F2 to calibrate the high end of the output range 2 Press F1 or F2 to adjust the ammeter reading UP or DOWN until a 20 mA reading is ach...

Page 15: ...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 4 To calibrate test additiona...

Page 16: ...librated 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 hig...

Page 17: ...n 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...

Page 18: ...lected analog input as shown in Figure 3 on page 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...

Page 19: ...UT prompt 1 6 2 2 Slope Point Temperature 1 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...

Page 20: ...number Calculate the slope number with the formula Slope Slope points set points slope temp set temp 2 Enter the RTD slope number and press ENT Procedure Options You have completed calibration of the...

Page 21: ...nal block as shown in Figure 4 below Refer to the menu map in Figure 6 on page 15 as a guide Figure 4 Typical Ohmmeter Connections For this discussion assume that the option card has been installed in...

Page 22: ...rs 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...

Page 23: ...re 6 on page 15 as a guide Figure 5 Frequency Counter Connections For this discussion assume that the option card has been installed in Slot x 1 8 1 Accessing the Calibration Menu 1 Press the CAL key...

Page 24: ...rect value 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 compl...

Page 25: ...ORE F2 ABORT HIGH REF CALIBRATING F1 F2 A B F1 F2 Set Slop F1 F2 Probe Numer F1 F2 SetPt Slope RTD Inputs Set Numer F1 F2 STORE ABORT Set Point Slope Point Set Point Slope Number Temp F1 F3 A C Alarms...

Page 26: ...Chapter 1 Calibration DigitalFlow GM868 Service Manual 16...

Page 27: ...ting process All of the possible Model GM868 error code messages are discussed in this chapter along with the possible causes and the recommended actions When an error code is generated it will appear...

Page 28: ...ve Also check the value programmed into the SETUP SIGNL submenu as described in the Operator s Manual 2 4 E2 Sound Speed Error Problem The sound speed exceeds the limits programmed in the SETUP SIGNL...

Page 29: ...efer to Chapter 3 Diagnostics to correct any flowcell and or transducer problems 2 9 E7 Analog Out Error Problem The current in the analog output circuit exceeds the limits for the analog output port...

Page 30: ...asurement parameter For example choose KSCF M instead of SCF M See the Startup Guide for instructions 2 16 E14 Totals Overflow Problem The totalizers are unable to keep up with the total flow signals...

Page 31: ...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 entering a new name 3 printing a log there...

Page 32: ...ibration Overflow The display value overflowed Reduce the number of decimal digits or change the units P L Enter L again The entered path length P is less than the axial dimension L Enter a new value...

Page 33: ...blems 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 t...

Page 34: ...P Transit S usec Displays the upstream transit time of the ultrasonic signal in microseconds N A N A Tdown DN Transit usec Displays the downstream transit time of the ultrasonic signal in microseconds...

Page 35: ...Pressure psia Displays the gas pressure 4 20 mA input N A N A Mw Molecular Wt Displays the average molecular weight of the gas N A N A AcVOL Act Vol KACF MIN Displays actual volumetric flow N A N A S...

Page 36: ...l of entrained particles may have little effect on the operation of the Model GM868 excessive amounts of solid or liquid particles will absorb or disperse the ultrasound signals This interference with...

Page 37: ...p Guide for a thorough discussion of this topic 3 5 Transducer Problems Ultrasonic transducers are rugged reliable devices However they are subject to physical damage from mishandling and chemical att...

Page 38: ...Chapter 3 Diagnostics 28 DigitalFlow GM868 Service Manual no content intended for this page...

Page 39: ...disconnect device must be marked as such clearly visible directly accessible and located within 1 8 m 6 ft of the Model GM868 The power cord is the main disconnect device An aluminum shroud over the...

Page 40: ...ejected from the fuse holder 4 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 below and on the wiring...

Page 41: ...circuit board remove the two screws or standoffs along the bottom edge of the printed circuit board Note For an LVD compliant meter with the clear plastic shroud over the electrical connectors there w...

Page 42: ...ht 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 co...

Page 43: ...snap rivets or metal hardware in some older meters In either case they may be discarded as new plastic snap rivets will be provided 3 There are six 32 pin option card sockets J41 J46 on the rear of t...

Page 44: ...s 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 Figur...

Page 45: ...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 IMPO...

Page 46: ...Model GM868 Note For compliance with the European Union s Low Voltage Directive this unit requires an external power disconnect device such as a switch or circuit breaker The disconnect device must be...

Page 47: ...number of the Model GM868 at the time of purchase Table 5 Spare Parts List Part Number Description 703 1127 02 Option Card Alarms Hermetically Sealed 703 1127 03 Option Card Alarms General Purpose 703...

Page 48: ...Chapter 4 Parts Replacement 38 DigitalFlow GM868 Service Manual no content intended for this page...

Page 49: ...N4 PIN5 PIN6 PIN7 PIN8 PIN9 CHAN 2 S I G N T R N T R G S I RS 232 T T T R T S N R X X C D R UP DN ANALOG OUT DN CHAN 1 G I S G N N S I R T R T UP X D C R S B A TWIND RWIND RCV GATE DRTN Nuts Washers 4...

Page 50: ...Cable Keypad Cable J2 Connector PC Board Ground Wire Screws or Standoffs Short Standoff 3 places Vertical Components Long Standoff 3 places Metal Bracket Option Card Connectors Fasteners typ Display...

Page 51: ...ter 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 A 2 Data Entry Record complete...

Page 52: ...Appendix A Service Record 42 DigitalFlow GM868 Service Manual Table 6 Service Record Continued Date Description of Service Performed By...

Page 53: ...o that unit Note For compliance with the European Union s Low Voltage Directive this unit requires an external power disconnect device such as a switch or circuit breaker The disconnect device must be...

Page 54: ...e 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 7 below and on the rear panel label 4 Reinstall the black plastic...

Page 55: ...ocket and that the option card is oriented with its external connector positioned in the opening on the rear panel 5 Repeat steps 3 and 4 to install any additional option cards 6 Place the metal brack...

Page 56: ...our 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...

Page 57: ...s Make sure that the LCD display assembly is oriented with the cables pointing toward the left side away from the keypad of the meter 6 Position the LCD display cables between the two mounting studs a...

Page 58: ...ctors Note These connectors should be pulled straight up and off the printed circuit board DO NOT remove the leads from the screw terminals 5 Remove the flat KEYPAD CABLE connector from terminal J50 n...

Page 59: ...d TRANSDUCER connectors onto the printed circuit board at the locations indi cated in Figure 11 on page 52 Make sure the marked pin 1 sides of the connectors face the right side keypad side of the enc...

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Page 61: ...E D 8 F TOTL FREQ RS232 USE ONLY WITH A 250V FUSE BEFORE SERVICING DISCONNECT POWER 100 120 VAC FUSE 1 AMP OFF ON 19 00 483 18 25 464 2 25 57 5 22 133 11 37 289 11 82 300 13 13 333 4 19 106 15 70 399...

Page 62: ...Output Connector CH1 Transducer Connector CH2 Transducer Connector EPROM U4 PCB Mounting Screw typ Printed Circuit Board Option Card Bracket Option Card Socket typ RS232 Connector Ground Lead Green O...

Page 63: ...een Error Message 17 Illustration 17 E EPROM Replacing 32 User Program 32 Error Codes 18 19 Error Message Display Screen 17 Expansion Slots 1 F Flowcell Problems Gas 26 Pipe 27 Fuse Holder 30 Rating 3...

Page 64: ...speed Error E2 18 Gas 26 Spare Parts List 37 Special Input Error E10 19 T Temperature Input Error E8 19 Totalizer Frequency Option Card Testing 13 Totals Overflow Error E14 20 Transducers Corrosion 27...

Page 65: ...urpose and warranties arising from course of dealing or usage or trade Return Policy If a Panametrics Sensing instrument malfunctions within the warranty period the following procedure must be complet...

Page 66: ...Warranty 56 DigitalFlow GM868 Service Manual...

Page 67: ...losure are not permitted The apparatus must be de energized before opening servicing and conducting any routine maintenance Installation shall be in accordance with the installation instructions and t...

Page 68: ...will be remotely mounted for process temperatures exceeding 85 C Markings Markings appear on the instrument label which identifies the product model serial number operating ranges hazardous area rati...

Page 69: ...2 3 2006 EN 61010 1 2012 Overvoltage Category II Other standards Used EN 50014 1997 A1 A2 EN 50018 2000 A1 following the provisions of the 2004 108 EC EMC 2006 95 EC Low Voltage and 94 9 EC ATEX Direc...

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Page 72: ...t and company names are trademarks of their respective holders 910 193S Rev F Customer Support Centers U S A The Boston Center 1100 Technology Park Drive Billerica MA 01821 U S A Tel 800 833 9438 toll...

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