Emerson Micro Motion 2700 Configuration And Use Manual page 105

Troubleshooting
Table 6-3 Output problems and possible remedies (continued)
Symptom
Inaccurate flow rate
Inaccurate density reading
Temperature reading significantly
different from process temperature
Temperature reading slightly different
from process temperature
Unusually high density reading
Unusually low density reading
Unusually high tube frequency
Unusually low tube frequency
Unusually low pickoff voltages
Unusually high drive gain
Configuration and Use Manual
Cause
Bad flow cal factor
Inappropriate measurement unit
Bad sensor zero
Bad density calibration factors
Bad flowmeter grounding
Slug flow
Wiring problem
Problem with process fluid
Bad density calibration factors
Wiring problem
Bad flowmeter grounding
Slug flow
Sensor cross-talk
Plugged flow tube
RTD failure
Incorrect calibration factors
Incorrect calibration factors
Plugged flow tube
Incorrect K2 value
Slug flow
Incorrect K2 value
Sensor erosion
Plugged flow tube
Several possible causes
Several possible causes
Possible remedies
Verify characterization. See Section 6.7.4.
Check measurement units using a
PROFIBUS host or configuration tool.
Rezero the flowmeter. See Section 3.6.
Verify characterization. See Section 6.7.4.
See Section 6.9.3.
See Section 6.10.
Verify all sensor-to-transmitter wiring and
ensure the wires are making good
contact. Refer to the installation manual.
Use standard procedures to check quality
of process fluid.
Verify characterization. See Section 6.7.4.
Verify all sensor-to-transmitter wiring and
ensure the wires are making good
contact. Refer to the installation manual.
See Section 6.9.3.
See Section 6.10.
Check environment for sensor with similar
(±0.5 Hz) tube frequency.
Check drive gain and tube frequency.
Purge the flow tubes. Sensor may need to
be replaced.
Check for alarm conditions and follow
troubleshooting procedure for indicated
alarm.
Perform temperature calibration. See
Section 3.8.
Verify characterization. See Section 3.3.
Perform temperature calibration. See
Section 3.8.
Verify characterization. See Section 3.3.
Check drive gain and tube frequency.
Purge the flow tubes.
Verify characterization. See Section 6.7.4.
See Section 6.10.
Verify characterization. See Section 6.7.4.
Contact Micro Motion Customer Service.
Check drive gain and tube frequency.
Purge the flow tubes. Sensor may need to
be replaced.
See Section 6.12.5.
See Section 6.12.3.
97