EN
14327097.02 09/2019 EN/DE/FR/ES
24
WIKA operating instructions models TGS55, TGS73 with 831 (Ex)
Faults
Causes
Measures
Dial has become
coloured
Ambient temperature
too high
Isolate against radiant
heat
Window cracked
If necessary, secure
thermometer via the
case
Exchange the instrument
Contact is no
longer switching in
accordance with the
specification
Electrical connection is
interrupted
Carry out a continuity
test on the electrical
connection lines
Electrical load
unsuitable for the
switch contact type
Maintain the permissible
electrical loads for the
switch contact model
Contact contaminated
Residual current
protection device for
the circuit is tripped
Insulation failure
Replace instrument
Contact chatter
(repeated, short-
duration opening and
closing)
Vibrations
Decouple the instrument
mechanically
No pointer movement
despite change in
pressure
Movement blocked
Replace instrument
6. Faults
