Maintenance, Cleaning And Calibration - WIKA TR10-A Manual De Instrucciones

7. Faults / 8. Maintenance, cleaning and calibration
Faults
Erroneous measured
values
(of thermocouples)
EN
Display of measured
value jumps
Corrosion
Signal interference

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.
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Causes
Parasitic voltages (thermal
voltages, galvanic voltage) or
wrong equalisation line
Cable break in connecting cable
or loose contact caused by
mechanical overload
Composition of the medium not
as expected or modified or wrong
thermowell material selected
Stray currents caused by electric
fields or earth loops
Earth loops
Carry out the cleaning process as described below.
Measures
Use suitable compensating cable
Replace probe or measuring insert
with a suitable design, for example
equipped with a strain relief or a
thicker conductor cross-section
Analyse medium and then select a
more suitable material or replace
thermowell regularly
Use shielded connecting cables,
and increase the distance to
motors and power cables
Eliminate potential differences by
using galvanically isolated barriers
or transmitters
WIKA operating instructions, models TRxx and TCxx