WIKA TGS55 Mode D'emploi page 24

6. Faults
Faults
Dial has become
coloured
EN
Window cracked
Contact is no
longer switching in
accordance with the
specification
Residual current
protection device for
the circuit is tripped
Contact chatter
(repeated, short-
duration opening and
closing)
No pointer movement
despite change in
pressure
24
Causes
Ambient temperature
too high
If necessary, secure
thermometer via the
case
Electrical connection is
interrupted
Electrical load
unsuitable for the
switch contact type
Contact contaminated
Insulation failure
Vibrations
Movement blocked
WIKA operating instructions models TGS55, TGS73 with 831 (Ex)
Measures
Isolate against radiant
heat
Exchange the instrument
Carry out a continuity
test on the electrical
connection lines
Maintain the permissible
electrical loads for the
switch contact model
Replace instrument
Decouple the instrument
mechanically
Replace instrument