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