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Configuration and Use Manual 203
Diagnostics and Troubleshooting Specifications – Model 3350/3700Specifications – Model 3300/3500Measurement Performance
Chapter 22
Diagnostics and Troubleshooting
22.1 About this chapter
This chapter explains how to use the diagnostic software to troubleshoot alarm conditions. Diagnostic
software includes:
• Meter fingerprinting
• Sensor simulation mode
• The active alarm log
• Alarm messages
• The diagnostic monitor
This chapter also provides additional information on troubleshooting.
22.2 Checking process variables
Micro Motion suggests that you make a record of basic process variables under normal operating
conditions. This will help you recognize when the process variables are unusually high or low. The
meter fingerprinting feature (see Section 22.3) may be used to record the current levels of twelve
process variables, and to view the recorded levels of these process variables at three other points of
transmitter operation.
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.
Unusual values for process variables may indicate a variety of different problems. Table 22-1 lists
several possible problems and remedies.
Table 22-1 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 16.3.
Inappropriate measurement unit Check configuration. See
Section 22.13.
Cutoff set too low Check configuration. See Section 7.3.2.
Bad flow calibration factor Verify characterization. See
Section 22.16.