Maintenance And Cleaning; Faults - WIKA TR10-L Mode D'emploi

8. Maintenance and cleaning / 9. Faults

8. Maintenance and cleaning

8.1 Maintenance
This thermometer is maintenance-free.
Repairs must only be carried out by the manufacturer.
8.2 Cleaning
CAUTION!
Clean the instrument with a moist cloth.
■
Electrical connections must not come into contact with moisture.
■
Wash or clean the dismounted instrument before returning it, in order to protect
■
personnel and the environment from exposure to residual media.
Residual media in dismounted instruments can result in a risk to persons, the
■
environment and equipment. Take sufficient precautionary measures.
For information on returning the instrument see chapter "10.2 Return".

9. Faults

Faults
No signal/ line breakage
Erroneous measured values
Erroneous measured values
(too low)
Erroneous measured values
and response times too long
Erroneous measured values
(of thermocouples)
Measurement signal -
„comes and goes"
Corrosion
WIKA Operating Instructions Model TR10-L/TC10-L EEx d
Causes
mechanical load too high or
overtemperature
Sensor drift caused by
overtemperature
Sensor drift caused by chemical
attack
Entry of moisture into cable or
measuring insert
Wrong mounting geometry, for
example mounting depth too
deep or heat dissipation too high
Deposits on the sensor or
thermowell
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
Measures
Replace probe or measuring insert
with a suitable design
Replace probe or measuring insert
with a suitable design
Use a design with thermowell
Replace probe or measuring insert
with a suitable design
The temperature-sensitive area of the
sensor must be inside the medium,
and surfaces must be isolated.
Remove deposits
Use a suitable equalisation line
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
GB
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