15.11.2 Temperature reading slightly different from process
temperature
Cause
• Sensor temperature not yet equalized
• Sensor leaking heat
Recommended actions
1. 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 service.
2. The temperature of the fluid may be changing rapidly. Allow sufficient time for the sensor to equalize
with the process fluid.
3. Install thermal installation, up to but not over, the transmitter housing.
4. Check the sensor coils for electrical shorts. If you find problems, replace the sensor.
5. The RTD may not be making good contact with the sensor. The sensor may need to be replaced.
15.11.3 Inaccurate temperature data from external device
Cause
• Wiring problem
• Problem with input configuration
• Problem with external device
Recommended actions
1. Verify the wiring between the transmitter and the external device.
2. Verify that the external device is operating correctly.
3. Verify the configuration of the temperature input.
4. Ensure that both devices are using the same measurement unit.
15.12 Check power supply wiring
If the power supply wiring is damaged or improperly connected, the transmitter may not receive enough
power to operate properly.
Prerequisites
• You will need the installation manual for your transmitter.
• A minimum of 1.5 amps of startup current is required
Procedure
1. Use a voltmeter to test the voltage at the transmitter’s power supply terminals.
• If the voltage is within the specified range, you do not have a power supply problem.
• If the voltage is low, ensure that the power supply is adequate at the source, the power cable is
sized correctly, there is no damage to the power cable, and an appropriate fuse is installed.
Configuration and Use Manual Troubleshooting
MMI-20048166 April 2019
Configuration and Use Manual 187
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