WIKA 54_twintemp - Manual (Page 11)

GB
Thermowell
Stem
Required safety
clearance
14004105.01 05/2011 GB/D/F/E
WIKA operating instructions model 54, Twin-Temp 11
6. Commissioning, ... / 7. Maintenance and ...
CAUTION!
When using thermowells, please
ensure that the stem does not
touch the bottom of the thermowell
since, due to the different
expansion coefficients of the
materials, the stem may become
buckled at the bottom of the
thermowell.
(Formula for the calculation of the
stem length l
1
see the respective
thermowell‘s data sheet)
7. Maintenance and cleaning
7.1 Maintenance
The combined bimetal thermometer is maintenance-free!
The indicator should be checked once or twice every year. To do this
the instrument must be disconnected from the process and checked
using a temperature calibrator.
Repairs must only be carried out by the manufacturer.
7.2 Cleaning
CAUTION!
■ Clean the thermometer with a moist cloth.
■ Wash or clean the disconnected thermometer before
returning it in order to protect personnel and the
environment from exposure to residual media.