Configuration and Use Manual
MMI-20019053
Troubleshooting
October 2022
12.33 Temperature measurement problems
Problem
Temperature reading significantly different from process temperature
Possible causes
• RTD failure
• Incorrect compensation factors
• Line temperature in bypass does not match temperature in main line
Recommended actions
• Check junction box for moisture or verdigris.
• Perform RTD resistance checks and check
for shorts to case (see Check the sensor coils
).
• Verify that the temperature compensation factors match the value on the sensor tag or calibration sheet.
• If Alert A004, A016, or A017 is active, perform the actions recommended for that alert.
Temperature reading slightly different from process temperature
• Sensor temperature not yet equalized
• Sensor leaking heat
Inaccurate temperature data from external device
• Wiring problem
• Problem with input configuration
• Problem with external device
• Problem with input configuration
• If the error is within the temperature specification for the sensor, there is no problem. If the temperature measurement is outside the specification, contact customer support.
• The temperature of the fluid may be changing rapidly. Allow sufficient time for the sensor to equalize with the process fluid.
• Perform RTD resistance checks and check
for shorts to case (see Check the sensor coils
).
• The electrical connection between the RTD and the sensor may be damaged. This may require replacing the sensor.
• Verify the wiring between the transmitter and the external device.
• Verify that the external device is operating correctly.
• Verify the configuration of the temperature input.
• Ensure that both devices are using the same measurement unit.
Configuration and Use Manual 215
Troubleshooting
October 2022
Configuration and Use Manual
MMI-20019053
216 Micro Motion 2700 Transmitters with Configurable Input/Outputs
