• Physical characteristics of sensor have changed
Recommended actions
1. Check the wiring between the sensor and the transmitter.
2. Check the grounding of all components.
3. Check your process conditions against the values reported by the device.
4. Ensure that all of the calibration parameters have been entered correctly. See the sensor tag or the
calibration sheet for your meter.
5. Check for two-phase flow.
6. If two sensors with similar frequency are too near each other, separate them.
7. Purge the sensor tubes.
8. Perform Smart Meter Verification.
15.6.3 Unusually high density reading
Cause
• Plugged or coated sensor tube
• Incorrect density calibration factors
• Inaccurate temperature measurement
• RTD failure
• In high-frequency meters, erosion, or corrosion
• In low-frequency meters, tube fouling
Recommended actions
1. Ensure that all of the calibration parameters have been entered correctly.
See the sensor tag or the calibration sheet for your meter.
2. Purge the sensor tubes.
3. Check for coating in the flow tubes.
4. Perform Smart Meter Verification.
15.6.4 Unusually low density reading
Cause
• Two-phase flow
• Incorrect calibration factors
• In low-frequency meters, erosion or corrosion
Recommended actions
1. Check your process conditions against the values reported by the device.
2. Verify all of the characterization or calibration parameters. See the sensor tag or the calibration sheet
for your meter.
Configuration and Use Manual Troubleshooting
MMI-20048166 April 2019
Configuration and Use Manual 177
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