18
WIKA operating instructions, models GDM-100-TI, GDM-100-TA
EN
14300398.01 04/2019 EN/DE/FR/ES
Faults
Causes
Measures
Contact is no longer
switching in line with the
specification
Electrical connection is
interrupted.
Carry out a continuity test on
the electrical connection lines.
Electrical load unsuitable for
the switch contact model.
Maintain the permissible
electrical loads for the switch
contact model.
Contact contaminated.
Switching status remains
unchanged despite
reaching the switch point/
reset point
Contacts defective (e.g. fused
contact zone).
Replace instrument. Before
recommissioning the
new instrument, provide
a protective circuit for the
contact.
No pointer movement
despite change in pressure
Movement blocked.
Replace instrument.
Pointer movement, even
though depressurised
Warming or cooling of the
measuring instrument (no
damage)
Let the instrument settle for 2
hours at 20 °C.
No output signal
Cable break
Replace connection cable
Deviating zero point signal
Overpressure limit exceeded
Observe the permissible
overpressure limit
Too high/low working temper-
ature
Observe the permissible
temperatures
Constant output signal
upon change in pressure
Mechanical overload caused
by overpressure
Replace instrument; if it
fails repeatedly, contact the
manufacturer
Signal span varies
EMC interference sources in
the environment; for example,
frequency converter
Shield instrument; cable
shield; remove source of
interference
Signal span varies/
inaccurate
Too high/low working
temperature
Observe the permissible
temperatures
Signal span drops/too
small
Mechanical overload caused
by overpressure
Replace instrument; if it
fails repeatedly, contact the
manufacturer
For claims, the serial and product numbers must be stated. The serial number is printed
on the dial, the product number on the product label. With claims, the atmospheric
pressure and the temperature during the measurement must be given, as well as the
data on the reference standard (model, class).
6. Faults
