Emerson Micro Motion 5700 Configuration And Use Manual page 306

Troubleshooting
March 2019
Table 17-7: Velocity measurement problems and recommended actions
Problem Possible causes
Erratic non-zero •
flow rate
•
at no-flow conditions
•
•
•
•
•
•
Erratic non-zero •
velocity reading when
•
velocity is steady
•
•
•
•
306
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
Two-phase flow
Damping value too low
Plugged or coated sensor tube
Output wiring problem
Problem with receiving device
Wiring problem
(continued)
Recommended actions
• Verify that the sensor orientation is
appropriate for your application. See the
installation manual for your sensor.
• Check the drive gain and the pickoff
voltage.
• 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
configured correctly for your application.
• Check for two-phase flow.
• Check for radio frequency interference.
• Contact customer service.
• Verify that the sensor orientation is
appropriate for your application. See the
installation manual for your sensor.
• Check the drive gain and the pickoff
voltage.
• Check for air entrainment, tube fouling,
flashing, or tube damage.
• 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
configured correctly for your application.
• Check for two-phase flow.
• Check for radio frequency interference.
• Contact customer service.
Micro Motion Model 5700 Transmitters with Configurable Outputs
Configuration and Use Manual
MMI-20025166