Micro Motion RFT9709 Manual de instrucciones Pagina 73

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Using ProLink
®
Software with Micro Motion
®
Transmitters
59
View Menu: Status
continued
Critical indicators
Configure Menu:
Transmitter Outputs
Configure Menu:
Transmitter Information
Configure Menu: EventsView Menu: Status
Configure Menu:
Characterize
Configure Menu:
Transmitter Variables
Figure 7-4. Test Point Diagnostics dialog box
Table 7-3. Troubleshooting excessive drive gain
3. Disconnect sensor wiring from the intrinsically safe transmitter
terminals (listed in
Table 7-2
, page 58), then use a DMM to measure
resistance between wire pairs.
If open or short circuits are found, or if measured resistance
values are outside the ranges listed in
Table 7-4
, page 60, the
sensor cable could be faulty. See
Table 7-5
, page 60, to
troubleshoot the problem.
If faulty sensor cable is not indicated, go to step 4.
4. Before reconnecting wiring at the transmitter terminals, measure
resistance between wire pairs at the sensor junction box.
If all measured resistance values are within the ranges listed in
Table 7-4
, page 60, either the process is outside acceptable
limits, or the flowmeter calibration needs to be changed. See
Table 7-5
, page 60, to troubleshoot the problem.
If open or short circuits are found, either the sensor junction box
contains moisture, or the sensor is damaged. See
Table 7-6
,
page 61, for corrective actions.
5. If troubleshooting fails to reveal why status indicators have switched
ON, phone the Micro Motion Customer Service Department for
technical assistance.
Symptom Cause Corrective action(s)
Drive gain
exceeds 8 V
Erratic process density (slug flow) has
caused flow tubes to vibrate erratically or
stop vibrating
Monitor density
Change sensor orientation
Plugged flow tube Purge flow tubes
Cavitation or flashing of process fluid If possible, increase inlet pressure and/or back pressure
If pump is mounted upstream from sensor, increase distance
between pump and sensor
Drive board or module failure
Cracked flow tube
Sensor imbalance
Phone the Micro Motion Customer Service Department
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