Endress+Hauser iTEMP TMT162 Operating Instructions Manual page 35

iTEMP TMT162
Endress+Hauser
Application errors without status messages for RTD sensor connection
Problem
Failure current (≤ 3.6 mA or
≥ 21 mA)
Application errors without status messages for TC sensor connection
Problem
Measured value is incorrect/
inaccurate
Failure current (≤ 3.6 mA or
≥ 21 mA)
Possible cause
Device programming is incorrect
(number of wires).
Device programming is incorrect
(scaling).
Incorrect RTD configured.
Sensor connection.
The cable resistance of the sensor
(two-wire) was not compensated.
Offset incorrectly set.
Faulty sensor.
Incorrect sensor connection.
Device programming is incorrect (e.g.
number of wires).
Incorrect programming.
Possible cause
Incorrect sensor orientation.
Heat conducted by sensor.
Device programming is incorrect
(scaling).
Incorrect thermocouple type (TC)
configured.
Incorrect comparison measuring
point set.
Interference via the thermocouple
wire welded in the thermowell
(interference voltage coupling).
Offset incorrectly set.
Faulty sensor.
Sensor is connected incorrectly.
Incorrect programming.
Diagnostics and troubleshooting
Solution
Change the Connection type device
function.
Change scaling.
Change the Sensor type device function.
Check that the sensor is connected
correctly.
Compensate the cable resistance.
Check offset.
Check the sensor.
Connect the connecting cables correctly
(terminal diagram).
Change the Connection type device
function.
Incorrect sensor type set in the Sensor
type device function. Set the correct
sensor type.
Solution
Install the sensor correctly.
Observe the face-to-face length of the
sensor.
Change scaling.
Change the Sensor type device function.
Set the correct comparison measuring
point .
Use a sensor where the thermocouple
wire is not welded.
Check offset.
Check the sensor.
Connect the connecting cables correctly
(terminal diagram).
Incorrect sensor type set in the Sensor
type device function. Set the correct
sensor type.
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