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iTEMP TMT71/72 Diagnostics and troubleshooting
Application errors without status messages for TC sensor connection
Problem Possible cause Remedy
Incorrect sensor orientation. Install the sensor correctly.
Heat conducted by sensor. Observe the face-to-face length of the
Device programming is incorrect
(scaling).
Measured value is incorrect/
inaccurate
Incorrect thermocouple type (TC)
configured.
Incorrect reference measuring point
set.
Interference via the thermocouple
wire welded in the thermowell
(interference voltage coupling).
Change the Sensor type device function.
Set the correct reference measuring
point .
Use a sensor where the thermocouple
wire is not welded.
Failure current (≤ 3.6 mA or
≥ 21 mA)
Offset incorrectly set. Check offset.
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.
9.2 Diagnostic information on local display
1
A
2
1
B
3
A0014837
A Display in the event of a warning
B Display in the event of an alarm
1 Status signal in the header
2 The display alternates between the primary measured value and the status - indicated by the appropriate
letter (M, C or S) - plus the defined error number.
3 The display alternates between "- - - -" (no valid measured value) and the status - indicated by the appropriate
letter (F) - plus the defined error number.
Endress+Hauser V. 1, Rev. 2, 4-10-2018 37
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