WIKA TR31-3 Operating Instructions Manual page 31

11. Faults
Faults
Erroneous measured
values (too low)
Erroneous measured
values and response
times too long
Display of measured
value jumps
Corrosion
Signal interference
CAUTION!
If faults cannot be eliminated by means of the measures
listed above, the instrument must be shut down immediately,
and it must be ensured that signal is no longer present, and
it must be prevented from being inadvertently put back into
service. In this case, contact the manufacturer.
If a return is needed, follow the instructions given in chapter
12.2 "Return".
WIKA operating instructions models TR31-3, TR31-K
Causes
Entry of moisture into
cable
Wrong mounting
geometry, for example
mounting depth too deep
or heat dissipation too
high
Deposits on the
thermowell
Cable break in
connecting cable or
loose contact caused by
mechanical overload
Composition of the
medium not as expected
or modified
Stray currents caused
by electric fields or earth
loops
Earth loops
Measures
Use the appropriate IP
protection
The temperature-sensitive
area of the sensor must
be inside the medium, and
surfaces measurements
must be ungrounded
Remove deposits
Replace the sensor or use
thicker conductor cross-
section
Analyse the medium
Use of screened
connecting cables,
increase in the distance to
motors and power lines
Elimination of potentials,
use of galvanically isolated
transmitter supply isolators
or transmitters
EN
31