Troubleshooting
10.4
Density problems
Table 10-4
Density problems and recommended actions
Problem
Possible causes
Recommended actions
Inaccurate density
reading
•
Problem with process fluid
•
Bad density calibration factors
•
Wiring problem
•
Bad flowmeter grounding
•
Slug flow
•
Sensor cross-talk
•
Plugged flow tube
•
Incorrect sensor orientation
•
RTD failure
•
Physical characteristics of sensor
have changed
•
Verify process conditions.
•
Verify characterization parameters.
•
Check the wiring between the sensor and
transmitter. See Section 10.10.
•
Check grounding. See Section 10.11.
•
Check for slug flow. See Section 10.24.
•
If two sensors with similar frequency are
too near each other, separate them.
•
Purge the flow tubes.
Unusually high
density reading
•
Plugged flow tube
•
Incorrect K2 value
•
Verify characterization parameters.
•
Purge the flow tubes.
•
Check for coating in the flow tubes.
Unusually low
density reading
•
Slug flow
•
Incorrect K2 value
•
Verify process conditions.
•
Verify characterization parameters.
•
Check the wiring between the sensor and
transmitter. See Section 10.10.
•
Check for tube erosion, especially if the
process fluid is abrasive.
10.5
Temperature problems
Table 10-5
Temperature problems and recommended actions
Problem
Possible causes
Recommended actions
Temperature reading
significantly different
from process
temperature
•
RTD failure
•
Wiring problem
•
Refer to status alarms (especially RTD
failure alarms).
•
Disable external temperature
compensation.
•
Verify temperature calibration.
•
Check the wiring between the sensor
and transmitter. See Section 10.10.
Temperature reading
slightly different from
process temperature
•
Sensor leaking heat
•
Perform temperature calibration.
Configuration and Use Manual
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