• Wiring problem
• Vibration in pipeline at rate close to sensor tube frequency
• Damping value too low
Recommended actions
1. Verify that the sensor orientation is appropriate for your application.
See the installation manual for your sensor.
2. Check the drive gain and the pickoff voltage.
3. If the wiring between the sensor and the transmitter includes either a 4-wire or a 9-wire segment,
verify that all the cable shields are correctly grounded.
4. Check the wiring between the sensor and the transmitter.
5. Verify zero after reviewing all of the above. If an auto is recommended, do so ONCE as close to
normal operating conditions as possible.
6. Check cutoffs and enter an appropriate nonzero value.
7. For sensors with a junction box, check for moisture in the junction box.
8. Purge the sensor tubes.
9. Check for open or leaking valves or seals.
10. Check for sources of vibration.
11. Verify damping configuration.
12. Check for two-phase flow.
13. Check for radio frequency interference.
14. Contact customer service.
16.8.4 Erratic non-zero flow rate when flow is steady
Cause
• Two-phase flow
• Damping value too low
• Moisture in sensor or transmitter junction box
• Wiring problem
• Problem with receiving device
Recommended actions
1. Verify that the sensor orientation is appropriate for your application.
See the installation manual for your sensor.
2. Check the drive gain and the pickoff voltage.
3. If the wiring between the sensor and the transmitter includes either a 4-wire or a 9-wire segment,
verify that all the cable shields are correctly grounded.
4. Check for air entrainment, tube fouling, flashing, or tube damage.
5. Perform a zero verification.
6. Verify measurement unit selection.
7. Check the wiring between the sensor and the transmitter.
8. For sensors with a junction box, check for moisture in the junction box.
9. Purge the sensor tubes.
Configuration and Use Manual Troubleshooting
MS-00809-0200-1600 May2024
Configuration and Use Manual 185
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