Maintenance And Cleaning - WIKA MH-3 Operating Instructions Manual

6. Faults/7. Maintenance and cleaning
Faults
Signal span too small/drops
EN
Signal span varies/inaccurate
Deviating zero point signal
If complaint is unjustified, we will charge you the complaint processing fees.

7. Maintenance and cleaning

7.1 Maintenance
This pressure sensor is maintenance-free.
Repairs must only be carried out by the manufacturer.
Regular inspection of the sealing by the operator is necessary.
12
Causes
Mechanical overload caused
by overpressure
Diaphragm damaged, e.g. due
to impacts, abrasive/aggres-
sive medium; corrosion at
diaphragm or process connec-
tion; transmission medium
missing
Sealing/sealing face damaged
or soiled, sealing does not
have a tight fit, threads jammed
EMC interference sources in
the environment; e.g. frequency
converter
Operating temperature too
high/low
Instrument not grounded
Strongly fluctuating pressure of
the process medium
Operating temperature too
high/low
Other mounting position
Overpressure limit exceeded
WIKA operating instructions, OEM pressure sensor, model MH-3
Measures
Replace instrument; if it
fails repeatedly, contact the
manufacturer.
Replace instrument; if it
fails repeatedly, contact the
manufacturer.
Clean the sealing/sealing face,
replace sealing if applicable
Shield instrument; cable shield;
remove source of interference
Lower/increase the tempera-
ture
Ground the instrument
Dampening; consulting by the
manufacturer
Lower/increase the tempera-
ture
Adjust the zero point
Reduce the pressure