WIKA GDM-100-TA Operating Instructions Manual page 18

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