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Configuration and Use Manual 133
Troubleshooting
Measurement Performance DefaultsTroubleshootingCompensation
Erratic non-zero flow rate under
no-flow conditions
Leaking valve or seal • Check pipeline.
Slug flow • See Section 11.14.
Plugged flow tube • Check drive gain and tube frequency.
Purge the flow tubes.
Incorrect sensor orientation • Sensor orientation must be
appropriate to process fluid. See the
installation manual for your sensor.
Wiring problem • Check the sensor circuitry. See
Section 11.21.
Vibration in pipeline at rate close to
sensor tube frequency
• Check environment and remove
source of vibration.
Damping value too low • Check configuration. See Section 8.4.
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.
Erratic non-zero flow rate when flow
is steady
Slug flow • See Section 11.14.
Damping value too low • Check configuration. See Section 8.4.
Plugged flow tube • Check drive gain and tube frequency.
Purge the flow tubes.
Excessive or erratic drive gain • See Section 11.20.3
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.
Wiring problem • Check the sensor circuitry. See
Section 11.21.
Inaccurate flow rate Bad flow calibration factor • Verify characterization. See
Section 6.2.
Inappropriate measurement unit • Check configuration. See
Section 11.16.
Bad sensor zero • Rezero the flowmeter or restore the
factory zero or prior zero. See
Section 10.5.
Bad density calibration factors • Verify characterization. See
Section 6.2.
Bad flowmeter grounding • See Section 11.7.3.
Slug flow • See Section 11.14.
Wiring problem • Check the sensor circuitry. See
Section 11.21.
Table 11-3 Process variables problems and remedies continued
Symptom Cause Suggested remedy