WIKA TGS55 Mode D'emploi page 23

6. Faults
WARNING!
Physical injuries and damage to property and the
environment caused by hazardous media
Upon contact with hazardous media (e.g. oxygen, acetylene,
flammable or toxic substances), harmful media (e.g. corrosive,
toxic, carcinogenic, radioactive), and also with refrigeration
plants and compressors, there is a danger of physical injuries
and damage to property and the environment.
Should a failure occur, aggressive media with extremely high
temperature and under high pressure or vacuum may be
present at the instrument.
▶
For these media, in addition to all standard regulations,
the appropriate existing codes or regulations must also be
followed.
For contact details see chapter 1 "General information" or the
back page of the operating instructions.
Faults
The pointer does
not move on rising
temperature
No readability as a
result of fogged/iced
window
Pointer has fallen off
Blisters in the window
(laminated safety glass)
Not possible to screw
the instrument into the
thermowell
WIKA operating instructions models TGS55, TGS73 with 831 (Ex)
Causes
Break in the bimetal
possibly due to vibration
Operate at
temperatures below the
freezing point
No fill fluid in the case
Too strong vibration or
shock loading
Ambient temperature
too high
Incorrect thread or stem
diameter or thermowell
stem too long
Measures
Remove the instrument
and replace
Wait for the instrument
temperature and the room
temperature to equalise
Replace with a
thermometer with fill fluid
Exchange the measuring
instrument with a
thermometer with filling
Isolate against radiant
heat
Exchange thermometer or
thermowell
EN
23