Temperature Measurement Problems - Emerson Micro Motion 2500 Configuration And Use Manual

Problem Possible causes
Unusually high densi- •
ty reading •
•
•
•
•
Unusually low density •
reading •
•
12.5

Temperature measurement problems

Problem Possible causes
Temperature reading •
significantly different •
from process temper- •
ature
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
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
• Check junction box for moisture or verdi-
gris.
• Perform RTD resistance checks and check
for shorts to case (see Section
• 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.
Troubleshooting
12.30.1).
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