20
WIKA operating instructions model TC52-M
14502900.01 12/2021 EN/DE/FR/ES
EN
6. Faults
CAUTION!
Physical injuries and damage to property and the environment
If faults cannot be eliminated by means of the measures listed, the instrument
must be taken out of operation immediately.
▶
Ensure that pressure or signal is no longer present and protect against
accidental commissioning.
▶
Contact the manufacturer.
▶
If a return is needed, please follow the instructions given in chapter 8.2
For contact details, please see chapter 1 “General information” or the back
page of the operating instructions.
Faults
Causes
Measures
No signal/cable break
Mechanical load too high or
overtemperature
Replace probe with one of a
suitable design
Erroneous measured
values
Sensor drift caused by
overtemperature
Replace probe with one of a
suitable design
Erroneous measured
values (too low)
Entry of moisture into cable or
measuring insert
Replace probe with one of a
suitable design
Erroneous measured
values and response
times too long
Wrong mounting geometry, e.g.
contact pressure too small or
heat dissipation too high
Loosen compression fitting at the
neck tube, press the probe harder
on the surface, hold the probe
in this position and tighten the
compression fitting
Deposits on the sensor
Remove deposits
Erroneous measured
values
(of thermocouples)
Parasitic voltages (thermal
voltages, galvanic voltage) or
wrong equalisation line
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 strain relief or a
thicker conductor cross-section
Signal interference
Stray currents caused by electric
fields or earth loops
Use shielded connection cables,
and increase the distance to
motors and power cables
Earth loops
Eliminate potential differences by
using galvanically isolated repeater
power supplies or transmitters
6. Faults
