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Flow measurement problems and recommended actions (continued)Table 10-3:
Problem Possible causes Recommended actions
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 10.10.
• 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.
• Zero the meter.
• Check grounding. See Section 10.11.
• Check for slug flow. See Section 10.25.
• 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 10.28.1.
• Replace the core processor or transmitter.
10.4 Density measurement problems
Density measurement problems and recommended actionsTable 10-4:
Problem Possible causes Recommended actions
Inaccurate density
reading
• Problem with process fluid
• Incorrect density calibration factors
• Wiring problem
• Incorrect flowmeter grounding
• Slug flow
• Plugged or coated flow tube
• Incorrect sensor orientation
• RTD failure
• Physical characteristics of sensor have
changed
• Check the wiring between the sensor and
transmitter. See Section 10.10.
• Check grounding. See Section 10.11.
• Check your process conditions against the
values reported by the flowmeter.
• Verify that all of the characterization parame-
ters match the data on the sensor tag.
• Check for slug flow. See Section 10.25.
• If two sensors with similar frequency are too
near each other, separate them.
• Purge the flow tubes.
Unusually high densi-
ty reading
• Plugged or coated flow tube
• Incorrect K2 value
• Incorrect temperature measurement
• RTD problem
• In high frequency meters, this can be an
indication of erosion or corrosion
• In low frequency meters this can indi-
cate tube fouling
• Verify that all of the characterization parame-
ters match the data on the sensor tag.
• Purge the flow tubes.
• Check for coating in the flow tubes.
Troubleshooting
168 Micro Motion
®
9739 MVD Transmitters