Endress+Hauser TMT122, Operating Instructions Manual

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9 Trouble-shooting Temperature DIN rail transmitter
28 Hauser
Application faults for TC connection
9.4 Returns
Returns Please follow the return Authorization Policy at the end of these instructions.
9.5 Disposal
Disposal Due to its construction, the DIN rail transmitter cannot be repaired. When disposing of the DIN rail
transmitter please take note of the local disposal regulations.
Fault Cause Action/cure
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 cor-
rect 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 ‘Operation’ and ‘Techni-
cal data’
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