Emerson MICRO MOTION 2700 Instrukcja Instalacji Strona 132

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122 Transmitter Configuration and Use: Series 1000 and 2000 Transmitters
Troubleshooting continued
10.12 Checking process variables
Micro Motion suggests that you make a record of the process variables listed below, under normal
operating conditions. This will help you recognize when the process variables are unusually high or
low.
Flow rate
Density
•Temperature
Tube frequency
Pickoff voltage
•Drive gain
For troubleshooting, check the process variables under both normal flow and tubes-full no-flow
conditions. Except for flow rate, you should see little or no change between flow and no-flow
conditions. If you see a significant difference, record the values and contact the Micro Motion
Customer Service Department for assistance. See Section 10.3.
Unusual values for process variables may indicate a variety of different problems. Table 10-6 lists
several possible problems and remedies.
Table 10-6 Process variables problems and possible remedies
Symptom Cause Possible remedy
Steady non-zero flow rate under
no-flow conditions
Misaligned piping (especially in new
installations)
Correct the piping.
Open or leaking valve Check or correct the valve mechanism.
Bad sensor zero Rezero the flowmeter. See Section 5.5.
Bad flow calibration factor Verify characterization. See
Section 6.2.
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