Output Problems - Emerson Micro Motion 2700 Configuration And Use Manual

Troubleshooting
6.7

Output problems

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.
Unusual values for process variables may indicate a variety of different problems. Table 6-3 lists
several possible problems and remedies.
Table 6-3 Output problems and possible remedies
Symptom
No output or incorrect process
variable
Steady non-zero flow rate under
no-flow conditions
Configuration and Use Manual
Cause
CHANNEL parameter set incorrectly
Misaligned piping (especially in new
installations)
Open or leaking valve
Bad sensor zero
Bad flow cal factor
Possible remedies
Verify the CHANNEL parameter in the AI
block matches the correct transducer
block measurement channels.
Correct the piping.
Check or correct the valve mechanism.
Rezero the flowmeter. See Section 3.6.
Verify characterization. See Section 6.7.4.
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