Endress+Hauser iTEMP TMT82 - Page 38

Diagnostics and troubleshooting iTEMP TMT82
38 Endress+Hauser
Application errors without status messages for RTD sensor connection
Problem Possible cause Remedy
Measured value is incorrect/
inaccurate
Incorrect sensor orientation. Install the sensor correctly.
Heat conducted by sensor. Observe the face-to-face length of the
sensor.
Device programming is incorrect
(number of wires).
Change the Connection type device
function.
Device programming is incorrect
(scaling).
Change scaling.
Incorrect RTD configured. Change the Sensor type device function.
Sensor connection. Check that the sensor is connected
correctly.
The cable resistance of the sensor
(two-wire) was not compensated.
Compensate the cable resistance.
Offset incorrectly set. Check offset.
Failure current (≤ 3.6 mA or
≥ 21 mA)
Faulty sensor. Check the sensor.
RTD connected incorrectly. Connect the connecting cables correctly
(terminal diagram).
Incorrect device programming (e.g.
number of wires).
Change the Connection type device
function.
Incorrect programming. Incorrect sensor type set in the Sensor
type device function. Set the correct
sensor type.
Application errors without status messages for TC sensor connection
Problem Possible cause Remedy
Measured value is incorrect/
inaccurate
Incorrect sensor orientation. Install the sensor correctly.
Heat conducted by sensor. Observe the face-to-face length of the
sensor.
Device programming is incorrect
(scaling).
Change scaling.
Incorrect thermocouple type (TC)
configured.
Change the Sensor type device function.
Incorrect comparison measuring
point set.
Set the correct comparison measuring
point. →  67
Interference via the thermocouple
wire welded in the thermowell
(interference voltage coupling).
Use a sensor where the thermocouple
wire is not welded.
Offset incorrectly set. Check offset.
Failure current (≤ 3.6 mA or
≥ 21 mA)
Faulty sensor. Check the sensor.
Sensor is connected incorrectly. Connect the connecting cables correctly
(terminal diagram).
Incorrect programming. Incorrect sensor type set in the Sensor
type device function. Set the correct
sensor type.