13
WIKA operating instructions, pressure transmitter, model MH-1
EN
2009211.08 10/2017 EN/DE/FR/ES
Faults
Causes
Measures
Constant output signal upon
change in pressure
Mechanical overload caused
by overpressure
Replace instrument; if it
fails repeatedly, contact the
manufacturer.
Signal span too small/drops
Mechanical overload caused
by overpressure
Replace instrument; if it
fails repeatedly, contact the
manufacturer.
Diaphragm damaged, e.g.
due to impacts, abrasive/
aggressive medium; corrosion
at diaphragm or process
connection; transmission
medium missing
Replace instrument; if it
fails repeatedly, contact the
manufacturer.
Sealing/sealing face damaged
or soiled, sealing does not
have a tight fit, threads
jammed
Clean the sealing/sealing
face, replace sealing if appli-
cable
Signal span varies/inaccurate
EMC interference sources
in the environment; e.g.
frequency converter
Shield instrument; cable
shield; remove source of
interference
Operating temperature too
high/low
Lower/increase the
temperature
Instrument not grounded
Ground the instrument
Strongly fluctuating pressure
of the process medium
Damping; consulting by the
manufacturer
Deviating zero point signal
Operating temperature too
high/low
Lower/increase the
temperature
Other mounting position
Adjust the zero point
Overpressure limit exceeded
Reduce the pressure
If complaint is unjustified, we will charge you the complaint processing fees.
6. Faults