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7. Faults / 8. Maintenance, cleaning and calibration
14150915.07 11/2020 EN/DE/FR/ES
WIKA operating instructions, models TRxx and TCxx24
Faults Causes Measures
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 connecting 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
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 shielded connecting cables,
and increase the distance to
motors and power cables
Earth loops Eliminate potential differences by
using galvanically isolated barriers
or transmitters
8. Maintenance, cleaning and calibration
For contact details, please see chapter 1 “General information” or the back
page of the operating instructions.
8.1 Maintenance
The thermometers described here are maintenance-free.
Repairs must only be carried out by the manufacturer.
8.2 Cleaning
CAUTION!
Physical injuries and damage to property and the environment
Improper cleaning may lead to physical injuries and damage to property and
the environment. Residual media in the dismounted instrument can result in a
risk to persons, the environment and equipment.
϶
Carry out the cleaning process as described below.
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