WIKA MH-4, Operating Instructions Manual, Page: 13 / 92

13 WIKA operating instructions pressure sensor, model MH-4
14170805.01 06/2020 EN/DE/FR/ES
EN
6. Faults
Faults Causes Measures
Plastic has faded UV irradiation No measures required
Discolouration is harmless
No output signal Cable break Check the continuity, and if neces-
sary exchange the cable
No/wrong power supply Rectify the power supply
No/wrong output
signal
Wiring error Rectify the wiring
Constant output
signal upon
change in pressure
Mechanical overload caused by
overpressure
Replace instrument; if it fails repea-
tedly, contact the manufacturer.
Signal span too
small/drops
Mechanical overload caused by
overpressure
Replace instrument; if it fails repea-
tedly, 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 applicable
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
Overload safety exceeded Reduce the pressure
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