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98 Micro Motion
®
Model 1500 Transmitters with the Filling and Dosing Application
Troubleshooting
11.11 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. The meter fingerprinting feature can also provide useful data (see Section 11.12).
• 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 Micro Motion customer
service for assistance. See Section 1.8.
Unusual values for process variables may indicate a variety of different problems. Table 11-5 lists
several possible problems and remedies.
Table 11-5 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 3.5.
Bad flow calibration factor Verify characterization. See
Section 4.2.