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6. Faults / 7. Maintenance and cleaning
Faults
Contact is no longer
switching in line with
the specification.
Residual current pro-
tection device for the
circuit is tripped.
Contact chatter (re-
peated, short-duration
opening and closing).
Switching state
remains unchanged
despite reaching the
switch point/reset
point.
No pointer movement
despite change in
pressure.
For the exchange of the instrument chapters 8 "Dismounting, return and disposal" and 5
"Commissioning, operation" must be observed.
7. Maintenance and cleaning
The instruments are maintenance-free.
The indicator and switching function should be checked once or twice every year.
For this the instrument must be disconnected from the process to check with a
pressure testing device.
Repairs must only be carried out by the manufacturer.
Clean the instrument with a moist cloth.
Operating instructions pressure gauges with switch contact models 821, 851 or 830 E
Causes
Electrical connection is
interrupted.
Electrical load unsuita-
ble for the switch contact
model.
Contact contaminated.
Insulation failure
Vibrations
Contacts defective (e.g.
fused contact zone).
Movement blocked.
Measures
Carry out a continuity test on the
electrical connection lines.
Maintain the permissible electrical
loads for the switch contact model.
Replace instrument
Decouple the instrument
mechanically.
Replace instrument Before recom-
missioning the new instrument,
provide a protective circuit for the
contact.
Replace instrument
EN
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