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Configuration and Use Manual 99
Troubleshooting
Measurement Performance DefaultsTroubleshootingCompensation
Erratic non-zero flow rate under
no-flow conditions
RF interference Check environment for RF interference.
See Section 11.14.4.
Wiring problem Verify all sensor-to-transmitter wiring
and ensure the wires are making good
contact.
Incorrectly grounded 9-wire cable (in
remote core processor with remote
transmitter installations)
Verify 9-wire cable installation. Refer to
Appendix B for diagrams, and see the
installation manual for your transmitter.
Vibration in pipeline at rate close to
sensor tube frequency
Check environment and remove source
of vibration.
Leaking valve or seal Check pipeline.
Inappropriate measurement unit Check configuration. See
Section 11.19.
Inappropriate damping value Check configuration. See Section 4.5.5
and Section 6.6.
Slug flow See Section 11.17.
Plugged flow tube Check drive gain and tube frequency.
Purge the flow tubes.
Moisture in sensor junction box Open junction box and allow it to dry.
Do not use contact cleaner. When
closing, ensure integrity of gaskets and
O-rings, and grease all O-rings.
Mounting stress on sensor Check sensor mounting. Ensure:
• Sensor is not being used to support
pipe.
• Sensor is not being used to correct
pipe misalignment.
• Sensor is not too heavy for pipe.
Sensor cross-talk Check environment for sensor with
similar (±0.5 Hz) tube frequency.
Incorrect sensor orientation Sensor orientation must be appropriate
to process fluid. See the installation
manual for your sensor.
Erratic non-zero flow rate when flow
is steady
Output wiring problem Verify wiring between transmitter and
receiving device. See the installation
manual for your transmitter.
Problem with receiving device Test with another receiving device.
Inappropriate measurement unit Check configuration. See
Section 11.19.
Inappropriate damping value Check configuration. See Section 4.5.5
and Section 6.6.
Excessive or erratic drive gain See Section 11.23.3
and
Section 11.23.4.
Slug flow See Section 11.17.
Plugged flow tube Check drive gain and tube frequency.
Purge the flow tubes.
Wiring problem Verify all sensor-to-transmitter wiring
and ensure the wires are making good
contact.
Table 11-5 Process variables problems and possible remedies continued
Symptom Cause Possible remedy