Trouble-shooting TMT180
16 Endress+Hauser
9 Trouble-shooting
9.1 Trouble-shooting instructions
If faults occur after commissioning or during measurement always start any fault finding sequence
using the following checklists. The user is guided to the possible fault cause and its removal by
question and answer.
9.2 Application errors without messages
9.2.1 General application errors
9.2.2 Application errors for RTD connection (Pt100)
Error Cause Action/cure
No communication
2 wire connection incorrect Re-connect correctly (see connection
diagram)
No power supply on the 2-wire
connection
Check the current loop
Power supply too low (< 10 V) Check power supply
Defective interface cable Check interface cable
Defective interface Check PC interface
Defective device Replace device
Error Cause Action/cure
Fault current
(≤ 3.6 mA or ≥ 21 mA)
Defective sensor Check sensor
Incorrect connection of RTD Connect cables correctly to terminal
schematic
Incorrect connection of the 2-wire cable Connect cables correctly to terminal
schematic (polarity)
No power supply on the 2-wire
connection
Check current loop; the supply should be
> 10 V
Incorrect transmitter programming
(number of wires)
Change device function ’Connection
mode’ (see chap. ’Commissioning’)
Defective device Replace device
Error Cause Action/cure
Measured value incorrect/
inaccurate
Faulty sensor installation Install sensor correctly
Heat conducted by sensor Take note of sensor installation point
Transmitter setup faulty (number of wires) Change device function ’Connection
mode’
Transmitter setup faulty (scale) Change scale
Incorrect RTD setup Change device function ’Sensor type’
Sensor connection (2-wire) Check sensor connection
Sensor cable resistance (2-wire) not
compensated
Compensate cable resistance
Offset incorrectly set Check offset
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