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Diagnostics and troubleshooting iTEMP TMT71/72
Faulty connection to the fieldbus host system
Problem Possible cause Remedy
Device is not
responding.
Supply voltage does not match that
specified on the nameplate.
Connecting cables are not in contact with
the terminals.
Check the voltage at the transmitter
directly using a voltmeter and correct.
Check the contacting of the cables and
correct if necessary.
Electronics unit is defective. Replace the device.
Signal line is not wired correctly. Check wiring.
Electronics unit is defective. Replace the device.
HART
communication is
not working.
Missing or incorrectly installed
communication resistor.
Install the communication resistor (250 Ω)
correctly.
Error messages in the configuration software
→ 38
Application errors without status messages for RTD 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
Measured value is incorrect/
inaccurate
Device programming is incorrect
(number of wires).
Device programming is incorrect
(scaling).
sensor.
Change the Connection type device
function.
Change scaling.
Incorrect RTD configured. Change the Sensor type device function.
Sensor connection. Check that the sensor is connected
The cable resistance of the sensor (2-
wire) was not compensated.
correctly.
Compensate the cable resistance.
Offset incorrectly set. Check offset.
Faulty sensor. Check the sensor.
RTD connected incorrectly. Connect the connecting cables correctly
Failure current (≤ 3.6 mA or
≥ 21 mA)
Device programming is incorrect (e.g.
number of wires).
(terminal diagram).
Change the Connection type device
function.
Incorrect programming. Incorrect sensor type set in the Sensor
type device function. Set the correct
sensor type.
36 V. 1, Rev. 2, 4-10-2018 Endress+Hauser
Commubox is connected incorrectly. Connect Commubox correctly.
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