Recommended actions
1. Verify the output wiring.
2. Ensure that Discrete Output Polarity is set correctly.
15.8 Flow measurement problems
15.8.1 Flow rate reported as zero when flow is present
Cause
The process condition is below cutoff.
Recommended actions
Verify the cutoffs.
15.8.2 Flow indication at no flow conditions or zero offset
Cause
• Misaligned piping (especially in new installations)
• Open or leaking valve
• Incorrect sensor zero
Recommended actions
1. Verify all of the characterization or calibration parameters.
See the sensor tag or the calibration sheet for your meter.
2. If the reading is not excessively high, review the live zero. You may need to restore the factory zero.
3. Check for open or leaking valves or seals.
4. Check for mounting stress on the sensor (e.g., sensor being used to support piping, misaligned piping).
5. Contact customer service.
15.8.3 Erratic non-zero flow rate at no-flow conditions
Cause
• Leaking valve or seal
• Two-phase flow
• Plugged or coated sensor tube
• Incorrect sensor orientation
• Wiring problem
• Vibration in pipeline at rate close to sensor tube frequency
• Damping value too low
• Mounting stress on sensor
Configuration and Use Manual Troubleshooting
MMI-20048166 April 2019
Configuration and Use Manual 179
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