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96 Model 2700 Transmitter with PROFIBUS-PA
Troubleshooting
Erratic non-zero flow rate under
no-flow conditions
Wiring problem Verify all sensor-to-transmitter wiring and
ensure the wires are making good
contact. Refer to the installation manual.
Incorrectly grounded 9-wire cable
(only in 9-wire remote and remote
core processor with remote
transmitter installations)
Verify 9-wire cable installation. Refer to
the installation manual.
Noise in PROFIBUS wiring Verify that the wiring is properly shielded
against noise.
Vibration in pipeline at rate close to
sensor frequency
Check the environment and remove the
source of vibration.
Leaking valve or seal Check pipeline.
Inappropriate measurement unit Check measurement units using a
PROFIBUS host or configuration tool.
Inappropriate damping value Check damping. See Section 6.7.1.
Slug flow Section 6.10.
Plugged flow tube Check drive gain and frequency. Purge the
flow tubes.
Moisture in sensor junction box (only
for 9-wire remote and remote core
processor with remote transmitter
installations)
Open junction box and allow it to dry. Do
not use contact cleaner. When closing,
ensure integrity of gaskets and O-rings,
and grease all O-rings.
Mounting stress on sensor Check sensor mounting. Ensure that:
• Sensor is not being used to support
pipe.
• Sensor is not being used to correct
misaligned pipe.
• Sensor is not too heavy for pipe.
Sensor cross-talk Check environment for sensor with similar
(±0.5 Hz) tube frequency.
Improper sensor grounding Check the sensor grounding. Refer to the
installation manual.
Incorrect sensor orientation Not all orientations work with all process
fluids. See the installation manual for your
sensor.
Erratic non-zero flow rate when flow
is steady
Output wiring problem Verify PROFIBUS wiring.
Inappropriate measurement unit Check measurement units using a
PROFIBUS host or configuration tool.
Inappropriate damping value Check damping. See Section 6.7.1.
Excessive or erratic drive gain See Sections 6.12.3 and 6.12.4.
Slug flow See Section 6.10.
Plugged flow tube Check drive gain and tube frequency.
Purge the flow tubes. Sensor may need to
be replaced.
Wiring problem Verify all sensor-to-transmitter wiring and
ensure the wires are making good
contact. Refer to the installation manual.
Table 6-3 Output problems and possible remedies (continued)
Symptom Cause Possible remedies