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

Problem Possible causes
Unusually high densi- •
ty reading •
•
•
•
•
Unusually low density •
reading •
•
9.4

Temperature measurement problems

Problem Possible causes
Temperature reading •
significantly different •
from process temper- •
ature
Temperature reading •
slightly different from •
process temperature
Configuration and Use Manual
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
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
RTD failure
Incorrect compensation factors
Line temperature in bypass does not
match temperature in main line
Sensor temperature not yet equalized
Sensor leaking heat
Recommended actions
• 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.
• 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.
Recommended actions
• Verify that the temperature compensation
factors match the value on the sensor tag
or calibration sheet.
• If Alert A004, A016, or A017 is active, per-
form the actions recommended for that
alert.
• If the error is within the temperature speci-
fication for the sensor, there is no prob-
lem. If the temperature measurement is
outside the specification, contact custom-
er support.
• The temperature of the fluid may be
changing rapidly. Allow sufficient time for
the sensor to equalize with the process flu-
id.
• The electrical connection between the RTD
and the sensor may be damaged. This may
require replacing the sensor.
Troubleshooting
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