Emerson Micro Motion 2400S Configuration And Use Manual page 128

Troubleshooting
Table 11-3 Process variables problems and remedies continued
Symptom
Erratic non-zero flow rate under
no-flow conditions
Erratic non-zero flow rate when flow
is steady
Inaccurate flow rate or batch total
120
Cause
Leaking valve or seal
Slug flow
Plugged flow tube
Incorrect sensor orientation
Wiring problem
Vibration in pipeline at rate close to
sensor tube frequency
Damping value too low
Mounting stress on sensor
Sensor cross-talk
Slug flow
Damping value too low
Plugged flow tube
Excessive or erratic drive gain
Output wiring problem
Problem with receiving device
Wiring problem
Bad flow calibration factor
Inappropriate measurement unit
Bad sensor zero
Bad density calibration factors
Bad flowmeter grounding
Slug flow
Wiring problem
Suggested remedy
• Check pipeline.
• See Section 11.14.
• Check drive gain and tube frequency.
Purge the flow tubes.
• Sensor orientation must be
appropriate to process fluid. See the
installation manual for your sensor.
• Check the sensor circuitry. See
Section 11.20.
• Check environment and remove
source of vibration.
• Check configuration. See Section 8.4.
• 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.
• Check environment for sensor with
similar (±0.5 Hz) tube frequency.
• See Section 11.14.
• Check configuration. See Section 8.4.
• Check drive gain and tube frequency.
Purge the flow tubes.
• See Section 11.19.3
• Verify wiring between transmitter and
receiving device. See the installation
manual for your transmitter.
• Test with another receiving device.
• Check the sensor circuitry. See
Section 11.20.
• Verify characterization. See
Section 6.2.
• Check configuration. See
Section 11.16.
• Rezero the flowmeter or restore the
factory zero or prior zero. See
Section 10.5.
• Verify characterization. See
Section 6.2.
• See Section 11.7.2.
• See Section 11.14.
• Check the sensor circuitry. See
Section 11.20.
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Micro Motion Model 2400S Transmitters for DeviceNet
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