Emerson Micro Motion 2500, Configuration And Use Manual

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Problem Possible causes Recommended actions
Erratic non-zero flow
rate at no-flow condi-
tions • Leaking valve or seal
• Two-phase flow
• Plugged or coated sensor tube
• Incorrect sensor orientation
• Wiring problem
• Vibration in pipeline at rate close to sensor
tube frequency
• Damping value too low
• Mounting stress on sensor
• Verify that the sensor orientation is appro-
priate for your application (refer to the
sensor installation manual).
• Check the drive gain and the pickoff volt-
age.
• If the wiring between the sensor and the
transmitter includes a 9-wire segment,
verify that the 9-wire cable shields are cor-
rectly grounded.
• Check the wiring between the sensor and
the transmitter.
• For sensors with a junction box, check for
moisture in the junction box.
• Purge the sensor tubes.
• Check for open or leaking valves or seals.
• Check for sources of vibration.
• Verify damping configuration.
• Verify that the measurement units are con-
figured correctly for your application.
• Check for two-phase flow.
• Check for radio frequency interference.
• Contact customer support.
Erratic non-zero flow
rate when flow is
steady • Two-phase flow
• Damping value too low
• Plugged or coated sensor tube
• Output wiring problem
• Problem with receiving device
• Wiring problem
• Verify that the sensor orientation is appro-
priate for your application (refer to the
sensor installation manual).
• Check the drive gain and the pickoff volt-
age.
• If the wiring between the sensor and the
transmitter includes a 9-wire segment,
verify that the 9-wire cable shields are cor-
rectly grounded.
• Check for air entrainment, tube fouling,
flashing, or tube damage.
• Check the wiring between the sensor and
the transmitter.
• For sensors with a junction box, check for
moisture in the junction box.
• Purge the sensor tubes.
• Check for open or leaking valves or seals.
• Check for sources of vibration.
• Verify damping configuration.
• Verify that the measurement units are con-
figured correctly for your application.
• Check for two-phase flow.
• Check for radio frequency interference.
• Contact customer support.
Troubleshooting
Configuration and Use Manual 171