WIKA operating instructions models TR10-0, TC10-0 (FM, CSA)
14503941.01 11/2021 EN/DE/FR/ES
17
EN
Faults
Causes
Measures
No signal/line break
Mechanical load too high or
overtemperature
Replacement of the sensor or the
measuring insert with a suitable version
Erroneous measured
values
Sensor drift caused by
overtemperature
Replacement of the sensor or the
measuring insert with a suitable version
Sensor drift caused by chemical
attack
Use of a suitable thermowell
Erroneous measured
values (too low)
Entry of moisture into cable or
measuring insert
Replacement of the sensor or the
measuring insert with a suitable version
Erroneous measured
values and response
times too long
Wrong mounting geometry, for
example mounting depth too deep
or heat dissipation too high
The temperature-sensitive area of the
sensor must be inside the medium, and
surfaces must be ungrounded
Deposits on the sensor or
thermowell
Remove deposits
Erroneous
measured values (of
thermocouples)
Parasitic voltages (thermal
voltages, galvanic voltage) or
wrong equalisation line
Check polarity
Use of a suitable equalisation line
Indication of the
measured value jumps
Cable break in connection cable
or loose contact caused by
mechanical overload
Replacement of the sensor or measuring
insert with a suitable design, for example
fitted with strain relief or a thicker
conductor cross-section
Corrosion
Composition of the medium not
as expected or modified or wrong
thermowell material selected
Analyse medium and then select a more
suitable material or replace thermowell
regularly
Signal interference
Stray currents caused by electric
fields or earth circuits
Use of screened connection cables,
increase in the distance to motors and
power lines
Earth circuits
Elimination of potentials, use of
galvanically isolated transmitter supply
isolators or transmitters
8. Faults
