Faults; Maintenance And Cleaning - WIKA TW22 Mode D'emploi

8. Faults / 9. Maintenance and cleaning

8. Faults

Faults
Process-side thread
seized during assembly
Not possible to insert the
temperature sensor into
the thermowell
Leakage of process media
at the connection
■
between the process and
the thermowell
from the interface
■
between the thermowell
and the sensor
In the case of critical installations, we recommend a wake frequency calculation according
to ASME PTC 19.3 TW-2016 or Dittrich/Klotter. This engineering service is offered by WIKA.

9. Maintenance and cleaning

9.1 Maintenance
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 should only be carried out by the manufacturer or, following prior consultation, by
correspondingly qualified skilled personnel.
WIKA operating instructions thermowells
Causes
Unsuitable threaded coupling/
thermowell material pair
Foreign bodies in the thermowell
Damaged or contaminated
thermowell or temperature sensor
fastening thread
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
Select a suitable material pair
or use a suitable lubricant
Remove foreign bodies
Clean or recut the thread
Check order documentation
Return for repair
Check the seal, check the
tightening torques
Safe operation of the plant
can no longer be guaranteed
(in the worst case, this might
result in a complete rupture of
the thermowell)
EN
13