WIKA 73 - Manual (Page 15)

GB
11591367.02 05/2012 GB/D/F/E
WIKA operating instructions models 73, 74 (ATEX) 15
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 insertion length l
1
see the
respective thermowell data sheet)
6. Commissioning, operation / 7. Maintenance ...
7. Maintenance and cleaning
7.1 Maintenance
These gas actuated thermometers are maintenance-free!
The indicator should be checked once or twice every year. For 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 thermometer before returning it, in
order to protect personnel and the environment from
exposure to residual media.
Thermowell
Stem
Required safety
clearance