Emerson Micro Motion 2700 Configuration And Use Manual page 229

Table 12-3: Flow measurement problems and recommended actions
Problem Possible causes
Erratic non-zero flow •
rate when flow is •
steady •
•
•
•
Inaccurate flow rate •
or batch total •
•
•
•
•
•
•
Configuration and Use Manual
Slug flow
Damping value too low
Plugged or coated flow tube
Output wiring problem
Problem with receiving device
Wiring problem
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
(continued)
Recommended actions
• 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
• 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
• 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
• Check for radio frequency interference. See
Section 12.13.
• Contact Micro Motion.
• Check the wiring between the sensor and
transmitter. See Section
• 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
• Check for slug flow. See
• 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
12.27.
12.10.
Section 12.25.
12.10.
12.11.
Section 12.25.
221