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Flow measurement problems and recommended actions (continued)Table 12-3:
Problem Possible causes Recommended actions
Erratic non-zero flow
rate when flow is
steady
• Slug flow
• Damping value too low
• Plugged or coated flow tube
• Output wiring problem
• Problem with receiving device
• Wiring problem
• Verify that the sensor orientation is appropri-
ate for your application (refer to the sensor
installation manual).
• Check the drive gain and the pickoff voltage.
See Section 12.26 and Section 12.27.
• If the wiring between the sensor and the
transmitter includes a 9-wire segment, verify
that the 9-wire cable shields are correctly
grounded.
• Check for air entrainment, tube fouling,
flashing, or tube damage.
• Check the wiring between the sensor and
transmitter. See Section 12.10.
• For sensors with a junction box, check for
moisture in the junction box.
• Purge the flow tubes.
• Check for open or leaking valves or seals.
• Check for sources of vibration.
• Verify damping configuration.
• Verify that the measurement units are con-
figured correctly for your application.
• Check for slug flow. See Section 12.25.
• Check for radio frequency interference. See
Section 12.13.
• Contact Micro Motion.
Inaccurate flow rate
or batch total
• Wiring problem
• Inappropriate measurement unit
• Incorrect flow calibration factor
• Incorrect meter factor
• Incorrect density calibration factors
• Incorrect flowmeter grounding
• Slug flow
• Problem with receiving device
• Check the wiring between the sensor and
transmitter. See Section 12.10.
• Verify that the measurement units are con-
figured correctly for your application.
• Verify that all of the characterization parame-
ters match the data on the sensor tag.
• Perform a bucket test to verify batch totals.
• Zero the meter.
• Check grounding. See Section 12.11.
• Check for slug flow. See Section 12.25.
• Verify that the receiving device, and the wir-
ing between the transmitter and the receiv-
ing device.
• Check sensor coil resistance and for shorts to
case. See Section 12.28.1.
• Replace the core processor or transmitter.
Troubleshooting
Configuration and Use Manual 221