Maintenance And Cleaning - WIKA 73 Serie Manual De Instrucciones

6. Commissioning, operation / 7. Maintenance ...
Thermowell

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.
WIKA operating instructions models 73, 74 (ATEX)
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
Stem
thermowell data sheet)
required safety
clearance
see the respective
1
GB
15