Maintenance, Cleaning And Calibration - WIKA TR21 Mode D'emploi

10. Faults / 11. Maintenance, cleaning and calibration
Faults
Not possible to insert
the temperature
EN sensor into the
thermowell
Leakage of process
media
at the connection
■
between the process
and the thermowell
on the junction of
■
the thermowell with
the temperature
sensor or on the
temperature sensor

11. Maintenance, cleaning and calibration

For contact details see chapter 1 "General information" or the back page of
the operating instructions.
11.1 Maintenance
The resistance thermometers described here require absolutely no maintenance and
contain no components which could be repaired or replaced.
In general, thermowells are maintenance-free.
We recommend a visual check of the thermowell for leaks and damages at regular
intervals. Make sure that the seal is in perfect condition!
Repairs must only be carried out by the manufacturer.
22
Causes
Foreign bodies in the
thermowell
Damaged or contaminated
fastening threads of thermowell
or temperature sensor
Sensor dimension and those
of the inner diameter of the
thermowell do not match
Thermowell or sensor has
been bent or damaged during
installation
Error during installation or
defective seals
Damage, e.g. caused by
operating the thermowell under
a resonant vibration load
Measures
Remove foreign bodies
Clean or recut the thread
Check order documentation
Return for repair
Check the seal, check the tightening
torques (see chapter 5.1.1 and 5.1.2)
Safe operation of the plant can no
longer be guaranteed
(in the worst case, this might result in
a complete rupture of the thermowell)
WIKA operating instructions model TR21