10.4
Density measurement problems
Density measurement problems and recommended actions
Table 10-3:
Problem
Possible causes
Recommended actions
Inaccurate density
reading
•
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
•
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.
Unusually high densi-
ty reading
•
Plugged or coated sensor tube
•
Incorrect density calibration factors
•
Incorrect temperature measurement
•
RTD problem
•
In high-frequency meters, this can indicate
erosion or corrosion
•
In low-frequency meters, this can indicate
tube fouling
•
Ensure that all of the calibration parame-
ters have been entered correctly. See the
sensor tag or the calibration sheet for your
meter.
•
Verify all of the characterization or calibra-
tion parameters. See the sensor tag or the
calibration sheet for your meter.
•
Purge the sensor tubes.
•
Check for coating in the flow tubes.
Unusually low density
reading
•
Two-phase flow
•
Ensure that all of the calibration parame-
ters have been entered correctly. See the
sensor tag or the calibration sheet for your
meter.
•
In low-frequency meters, this can indicate
erosion or corrosion
•
Check your process conditions against the
values reported by the device.
•
Check for two-phase flow.
•
Verify all of the characterization or calibra-
tion parameters. See the sensor tag or the
calibration sheet for your meter.
•
Check the wiring between the sensor and
the transmitter.
•
Check for tube erosion, especially if the
process fluid is abrasive.
Troubleshooting
Configuration and Use Manual
77
Summary of Contents for Micro Motion LNG Series
Page 1: ...Configuration and Use Manual MMI 20032809 Rev AA February 2017 Micro Motion LNG Series Meters ...
Page 6: ...Contents iv Micro Motion LNG Series Meters ...
Page 8: ...Getting Started 2 Micro Motion LNG Series Meters ...
Page 12: ...Before you begin 6 Micro Motion LNG Series Meters ...
Page 18: ...Quick start 12 Micro Motion LNG Series Meters ...
Page 20: ...Configuration and commissioning 14 Micro Motion LNG Series Meters ...
Page 50: ...Configure device options and preferences 44 Micro Motion LNG Series Meters ...
Page 56: ...Integrate the meter with the control system 50 Micro Motion LNG Series Meters ...
Page 58: ...Complete the configuration 52 Micro Motion LNG Series Meters ...
Page 60: ...Operations maintenance and troubleshooting 54 Micro Motion LNG Series Meters ...
Page 74: ...Measurement support 68 Micro Motion LNG Series Meters ...
Page 94: ...Using ProLink III with the transmitter 88 Micro Motion LNG Series Meters ...
Page 98: ...Default values and ranges 92 Micro Motion LNG Series Meters ...
Page 99: ...Default values and ranges Configuration and Use Manual 93 ...
