EN
27WIKA operating instructions, models TRxx and TCxx
14150915.08 04/2024 EN/DE/FR/ES
Faults Causes Measures
No signal/cable break Mechanical load too high or
overtemperature
Replace probe or measuring insert
with one of a suitable design
Erroneous measured
values
Sensor drift caused by
overtemperature
Replace probe or measuring insert
with one of a suitable design
Sensor drift caused by chemical
attack
■
Analyse the medium
■
Select a more suitable material
or replace thermowell/protec-
tion tube regularly
Erroneous measured
values (too low)
Entry of moisture into cable or
measuring insert
Replace probe or measuring insert
with one of a suitable design
Erroneous measured
values and response
times too long
Wrong mounting geometry, e.g.
insertion depth too small or heat
dissipation too high
The temperature-sensitive area
of the sensor must be inside the
medium, and surface measure-
ments must be ungrounded
Deposits on the sensor or
thermowell/protection tube
Remove deposits
Erroneous measured
values (of thermocou-
ples)
Parasitic voltages (thermoelec-
tric voltages, galvanic voltage)
or wrong compensating cable
Use suitable compensating cable
Display of measured
value jumps
Cable break in connection cable
or loose contact caused by
mechanical overload
Replace probe or measuring insert
with a suitable design, for example
equipped with a bend protection
spring or a thicker conductor
cross-section
Corrosion Composition of the medium not
as expected, modified or wrong
thermowell/protection tube
material selected
■
Analyse the medium
■
Select a more suitable material
or replace thermowell/protec-
tion tube regularly
Signal interference Stray currents caused by
electric fields or ground loops
Use shielded connection leads,
and increase the distance from
motors and power cables
Ground loops Eliminate potential differences by
using galvanically isolated repeat-
er power supplies or transmitters
6. Faults
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