Density Measurement Problems - Emerson Micro Motion 2700 Configuration And Use Manual

Troubleshooting
Problem Possible causes
Inaccurate flow rate •
or batch total •
•
•
•
•
•
•
•
9.3

Density measurement problems

Problem Possible causes
Inaccurate density •
reading •
•
•
•
•
•
•
•
118
Wiring problem
Inappropriate measurement unit
Incorrect flow calibration factor
Incorrect meter factor
Incorrect density calibration factors
Incorrect grounding
Two-phase flow
Problem with receiving device
Incorrect sensor zero
Problem with process fluid
Incorrect density calibration factors
Wiring problem
Incorrect grounding
Two-phase flow
Plugged or coated sensor tube
Incorrect sensor orientation
RTD failure
Physical characteristics of sensor have
changed
Micro Motion Model 2700 Transmitters with FOUNDATION Fieldbus
Recommended actions
• Check the wiring between the sensor and
the transmitter.
• Verify that the measurement units are con-
figured correctly for your application.
• Verify all of the characterization or calibra-
tion parameters. See the sensor tag or the
calibration sheet for your meter.
• Perform a bucket test to verify batch to-
tals.
• Zero the meter.
• Check the grounding of all components.
• Check for two-phase flow.
• Verify the receiving device, and the wiring
between the transmitter and the receiving
device.
• Check sensor coil resistance and for shorts
to case.
• Replace the transmitter.
Recommended actions
• Check your process conditions against the
values reported by the device.
• Ensure that all of the calibration parame-
ters have been entered correctly. See the
sensor tag or the calibration sheet for your
meter.
• Check the wiring between the sensor and
the transmitter.
• Check the grounding of all components.
• Verify all of the characterization or calibra-
tion parameters. See the sensor tag or the
calibration sheet for your meter.
• Check for two-phase flow.
• If two sensors with similar frequency are
too near each other, separate them.
• Purge the sensor tubes.