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204 Micro Motion
®
Series 3000 MVD Transmitters and Controllers
Diagnostics and Troubleshooting
Erratic non-zero flow rate under
no-flow conditions
RF interference Check environment for RF interference.
See Section 22.11.5.
Wiring problem Verify all sensor-to-transmitter wiring
and ensure the wires are making good
contact.
Incorrectly grounded 9-wire cable
(remote core processor with remote
transmitter installations)
Verify 9-wire cable installation.
Vibration in pipeline at rate close to
sensor tube frequency
Check environment and remove source
of vibration.
Improper sensor grounding (T-Series
sensors only)
Verify that the sensor is grounded to
earth ground.
Leaking valve or seal Check pipeline.
Inappropriate measurement unit Check configuration. See
Section 22.13.
Inappropriate damping value Check configuration. See Section 7.3.2.
Slug flow See Slug flow alarms in Section 22.7.3.
Plugged flow tube Check drive gain and tube frequency.
Purge the flow tubes or replace the
sensor.
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 Series 3000
device and receiving device. See the
transmitter installation instructions.
Problem with receiving device Test with another receiving device.
Inappropriate measurement unit Check configuration. See
Section 22.13.
Inappropriate damping value Check configuration. See Section 7.3.2.
Excessive or erratic drive gain See Section 22.18.3
and
Section 22.18.4.
Slug flow See Slug flow alarms in Section 22.7.3.
Plugged flow tube Check drive gain and tube frequency.
Purge the flow tubes or replace the
sensor.
Wiring problem Verify all sensor-to-transmitter wiring
and ensure the wires are making good
contact.
Table 22-1 Process variables problems and possible remedies continued
Symptom Cause Possible remedy