Temperature head transmitter 9 Trouble-shooting
Endress+Hauser 51
Application faults for TC connection
9.4 Spare parts
Spare parts Head transmitter installation set
(4 screws, 6 springs, 10 circlips)
Order No.: 510 01112
9.5 Returns
Returns When returning the unit for repair, please add a description of both the fault and the
application.
9.6 Disposal
Disposal Due to its construction, the head transmitter cannot be repaired. When disposing of the
head 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’ set-up; set up
correct thermocouple
Incorrect 2 wire connection (cur-
rent loop)
Connect the cables correctly
(see connection diagram)
Defective head transmitter Replace head transmitter
Measured value incorrect/inaccu-
rate
Faulty sensor installation Install sensor correctly
Heat conducted via sensor Take note of sensor installation
length
Transmitter programming faulty
(scale)
Change scale
Incorrect thermocouple set up Change parameter ‘Sensor type’
Incorrect cold junction set up See chapter ‘Operation’ and
‘Techn. data’
Offset incorrectly set up Check offset
Fault on the thermowell welded
thermo wire (coupling of interfer-
ence voltages)
Use sensor where the thermo
wire is not welded
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