EN
14073045.04 03/2019 EN/DE
WIKA operating instructions model TR25 (Ex i)
28
12. Faults
12. Faults
Faults
Causes
Measures
No signal/line break
Mechanical load too high or
overtemperature
Replacement of the resistance
thermometer
Erroneous measured
values
Sensor drift caused by
overtemperature
Replacement of the resistance
thermometer
Erroneous measured
values (too low)
Entry of moisture into cable
Replacement of the resistance
thermometer
Erroneous measured
values and response
times too long
Wrong mounting geometry or
heat dissipation too high
The temperature-sensitive area of the
sensor must be inside the medium.
Beware of the mounting position of the
sensor!
Deposits within the thermowell Remove deposits
Indication of the
measured value
jumps
Cable break in connecting
cable or loose contact caused
by mechanical overload
Check the supply cable
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 loops
Use of screened connecting cables,
increase in the distance to motors and
power lines
Earth circuits
Elimination of potentials, use of
galvanically isolated transmitter supply
isolators or transmitters
CAUTION!
If faults cannot be eliminated by means of the measures listed above, shut
down the instrument immediately, and ensure that pressure and/or signal are no
longer present, and secure the instrument from being put back into operation
inadvertently.
In this case, contact the manufacturer.
If a return is needed, follow the instructions given in chapter 13.2 “Return”.
Содержание TR25
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