Endress+Hauser iTEMP TMT112 - Page 24

Diagnostics and troubleshooting iTEMP TMT112
24 Endress+Hauser
Problem Pausible cause Remedy
Defective DIN rail transmitter Replace DIN rail transmitter
Measured value incorrect/inaccurate Faulty sensor installation Install sensor correctly
Heat conducted via sensor Take note of sensor installation length
Transmitter programming
faulty (wire number)
Change parameter ‘Connection type’
Transmitter programming
faulty (scale)
Change scale
Wrong RTD used Change parameter ‘Sensor type’
Sensor connection (2 wire) Check sensor connections
Sensor cable (2 wire) not
compensated
Compensate cable resistance
Offset incorrectly set Check offset
Application faults for TC connection
Problem Pausible cause Remedy
Fault current (≤ 3.6 mA or ≥ 21 mA) Sensor incorrectly connected Connect sensor correctly to terminal plan
(polarity)
Defective sensor Replace sensor
Programming Sensor type ’RTD’ setup; set up correct
thermocouple
Incorrect 2 wire connection
(current loop)
Connect the cables correctly (see
connection diagram)
Defective DIN rail transmitter Replace DIN rail transmitter
Measured value incorrect/inaccurate Faulty sensor installation Install sensor correctly
Heat conducted via sensor Take note of sensor installation length
Transmitter programming faulty
(scale)
Change scale
Incorrect thermocouple setup Change parameter ‘Sensor type’
Incorrect cold junction setup See chapter →  15‘Operation’ and
→  26
Offset incorrectly set up Check offset
Fault on the thermowell welded
thermo wire (coupling of
interference voltages)
Use sensor where the thermo wire is not
welded