6. Faults / 7. Maintenance and cleaning
Faults Causes Measures
Not possible to
screw the instrument
into the thermowell
Incorrect thread or stem
diameter or thermowell
stem too long
Exchange thermometer or
thermowell
Dial has become
coloured
Ambient temperature
too high
Isolate against radiated heat
Window cracked If necessary, secure
thermometer via the
case
Exchange the instrument
7. Maintenance and cleaning
Personnel: Skilled personnel or service personnel
Tools: Suitable spanner
For contact details see chapter 1 “General information” or the
back page of the operating instructions.
7.1 Maintenance
These gas-actuated thermometers are 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.
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