WIKA TW10-P - Manual (Page 10)

11405821.06 09/2010 GB/D/F/E
10 WIKA operating instructions thermowells
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.
9. Dismounting, return and disposal
WARNING!
Residual media on dismounted thermowells can result in a risk to persons, the
environment and equipment. Take sufficient precautionary measures.
9.1 Dismounting
WARNING!
Risk of burns!
Let the instrument cool down sufficiently before dismounting it!
When dismounting it, there is a risk that dangerously hot pressure media may escape.
Only disconnect thermowells once the system has been depressurised!
8. Faults / 9. Dismounting, return and disposal