Emerson Micro Motion 9739 MVD, Руководство по конфигурации и использованию

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Troubleshooting
Table 10-3 Flow problems and recommended actions
continued
Problem Possible causes Recommended actions
Erratic non-zero flow
rate when flow is
steady
• Slug flow
• Damping value too low
• Plugged flow tube
• Excessive or erratic drive gain
• Output wiring problem
• Problem with receiving device
• Wiring problem
• Verify that the sensor orientation is
appropriate for your application (refer to
the sensor installation manual).
• Check the drive gain and the pickoff
voltage. See Section 10.25 and Section
10.26 .
• For installation with 9-wire cabling,
verify that the 9-wire cable is correctly
grounded.
• Check the wiring between the sensor and
transmitter. See Section 10.10.
• 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
configured correctly for your application.
• Check for slug flow. See Section 10.24.
• Check for radio frequency interference.
See Section 10.12.
• Contact Micro Motion.
Inaccurate flow rate
or batch total
• Bad flow calibration factor
• Inappropriate measurement unit
• Bad sensor zero
• Bad density calibration factors
• Bad flowmeter grounding
• Slug flow
• Problem with receiving device
• Wiring problem
• Verify characterization parameters.
• Verify that the measurement units are
configured correctly for your application.
• Zero the meter.
• Check grounding. See Section 10.11.
• Check for slug flow. See Section 10.24.
• Verify that the receiving device, and the
wiring between the transmitter and the
receiving device
• Check the wiring between the sensor and
transmitter. See Section 10.10.
186 Micro Motion 9739 MVD Transmitters