WIKA TR21-C - Manual (Page 16)

14006814.01 05/2011 GB/D/F/E
16 WIKA operating instructions model TR21
GB
8. Faults
Faults Causes Measures
Not possible to insert the
temperature sensor into the
thermowell
Foreign bodies in the thermowell Remove foreign bodies
Damaged or contaminated
thermowell or temperature sensor
fastening thread
Clean or recut the thread
Sensor dimension and those of the
inner diameter of the thermowell do
not match
Check order documentation
Thermowell or sensor has been bent
or damaged during installation
Return for repair
Leakage of process media
■ at the connection between the
process and the thermowell
Error during installation or defective
seals
Check the seal, check the
tightening torques
■ from the interface between the
thermowell and the sensor
Damage, e.g. caused by operating
the thermowell under a resonant
vibration load
Safe operation of the
plant can no longer be
guaranteed
(in the worst case, this
might result in a complete
rupture of the thermowell)
In the case of critical installations, we recommend calculating the harmonic frequency of
the thermowell according to ASME PTC 19.3 or Dittrich/Klotter. This engineering service is
offered by WIKA.
CAUTION!
If faults cannot be eliminated by means of the measures listed above, the
instrument must be withdrawn from use immediately, it must be ensured that
there is no longer any pressure and/or signal and they must be prevented from
being inadvertently put back into service.
In this case, contact the manufacturer.
If a return is needed, follow the instructions given in chapter "9.2 Return".
8. Faults