Temperature Measurement Problems - Emerson Micro Motion 4200 Configuration And Use Manual

Troubleshooting
April 2019
15.10.7 mAO correct at lower current, but incorrect at higher
current
Cause
The mA loop resistance may be set too high.
Recommended actions
Verify that the mA Output load resistance is below the maximum supported load.
See the installation manual for your transmitter.
15.10.8 mAO goes in and out of fault conditions
Cause
There is a problem with the interaction between the Output Saturated alert and the fault action configured
for the output.
Recommended actions
1. Change the severity of the Output Saturated alert from Fault to another option.
2. Configure the transmitter to ignore the Output Saturated alert or the relevant conditions.
3. Change the configuration of Fault Action from Downscale to another option.

15.11 Temperature measurement problems

15.11.1 Temperature reading significantly different from process
temperature
Cause
• RTD failure
• Wiring problem
• Incorrect calibration factors
• Line temperature in bypass does not match temperature in main line
Recommended actions
1. For sensors with a junction box, check for moisture in the junction box.
2. Check the sensor coils for electrical shorts. If you find problems, replace the sensor.
3. Ensure that all of the calibration parameters have been entered correctly.
See the sensor tag or the calibration sheet for your meter.
4. Refer to status alerts (especially RTD failure alerts).
5. Disable external temperature compensation.
6. Verify temperature calibration.
7. Check the wiring between the sensor and the transmitter.
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Configuration and Use Manual
MMI-20048166
Micro Motion 4200 Transmitters