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 a 9-wire segment, verify that the 9-wire
cable shields are correctly grounded.
4. Check the wiring between the sensor and the transmitter.
5. For sensors with a junction box, check for moisture in the junction box.
6. Purge the sensor tubes.
7. Check for open or leaking valves or seals.
8. Check for sources of vibration.
9. Verify damping configuration.
10. Verify that the measurement units are configured correctly for your application.
11. Check for two-phase flow.
12. Check for radio frequency interference.
13. Contact customer service.
15.8.4 Erratic non-zero flow rate when flow is steady
Cause
•
Two-phase flow
•
Damping value too low
•
Plugged or coated sensor tube
•
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 a 9-wire segment, verify that the 9-wire
cable shields are correctly grounded.
4. Check for air entrainment, tube fouling, flashing, or tube damage.
5. Check the wiring between the sensor and the transmitter.
6. For sensors with a junction box, check for moisture in the junction box.
7. Purge the sensor tubes.
8. Check for open or leaking valves or seals.
9. Check for sources of vibration.
10. Verify damping configuration.
11. Verify that the measurement units are configured correctly for your application.
Troubleshooting
Configuration and Use Manual
April 2019
MMI-20048166
180
Micro Motion 4200 Transmitters
