Panametrics Sentinel LCT, User Manual

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Sentinel LNG User’s Manual 197
Chapter 9. Troubleshooting
Chapter 9. Troubleshooting
9.1 Introduction
The
Sentinel LNG
flow transmitter is a reliable, easy to maintain instrument. When properly installed and operated, as
described in Chapter 2, Installation , the meter provides accurate flow rate measurements with minimal user
intervention. However, if a problem should arise with the electronics enclosure or transducers, this chapter explains
how to troubleshoot the
Sentinel LNG
. Indications of a possible problem include:
• display of an error message on the LCD 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 occur, proceed with the instructions presented in this chapter.
Note: For high electrical noise areas, it is recommended to use the CE Installation methods in Appendix B.
9.2 Error Codes
If a problem occurs with the electronics or transducers, a built-in error code message system greatly simplifies the
troubleshooting process.
All of the possible
Sentinel LNG
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 in the lower right corner of the LCD screen,
as discussed in Chapter 3.
If an error message appears on the display screen during operation of the
Sentinel LNG
, refer to the appropriate
section of this chapter for instructions on how to proceed. You may be asked to consult the factory. It would be very
helpful to capture all of the diagnostic data and parameter information for each channel on the Data Records in
Appendix C prior to calling your local sales or service center.
9.2.1 E0: No Error
Problem: No error condition currently exists.
Cause: This message appears briefly to confirm that the response to another error message has corrected the
problem.
Action: No action is required.
9.2.2 E1: Low Signal
Problem: Poor ultrasonic signal strength or the signal exceeds the limits entered via the User Program.
Cause: Poor signal strength may be caused by a defective cable, a flowcell problem, a defective transducer or a
problem in the electronics console. A signal that exceeds the programmed limits is probably caused by
the entry of an improper value in the Error Limits option of the User Program.
Action: Using the procedures in Chapter 1, check the components listed above. Also, check the value entered into
the Signal Strength Error Limits option , as described on page 46.
9.2.3 E2: Soundspeed Error
Problem: The soundspeed exceeds the limits programmed in the Error Limits option of the User Program.
Cause: The error may be caused by incorrect programming, poor flow conditions or poor transducer orientation.
Action: Compare the measured soundspeed to tabulated nominal values for the process fluid and correct any
programming errors. Refer to the sections on Fluid and Pipe Problems (page 202) and Transducer
Problems (page 203) to correct any problems.
9.2.4 E3: Velocity Range Error
Problem: The velocity exceeds the limits programmed in the Error Limits option of the User Program.