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8 Maintenance and Repair
n
Users' qualifications: instructed persons,
Ä Chapter 1.2 "Users' qualifications "
see
on page 10
Maintenance interval
CAUTION!
–
Maintain the sensor regularly in order
to avoid over-metering in the event of
a sensor failure !
–
Please note the pertinent national
guidelines for service intervals!
–
Do not touch the electrodes or bring
them into contact with substances
containing grease!
Daily/weekly, depending on the application
Maintenance work
1.
Check the display value of the sensor on
the control device using a suitable refer‐
ence method (e.g. DPD-1)
2.
If necessary, recalibrate the sensor
Sand sensor with emery
If the sensor cannot be calibrated then the elec‐
trodes must be cleaned using the supplied
emery.
1.
With the sensor cap screwed on, clean
with the moistened emery (package
supplied) by rubbing with circular move‐
ments
2.
Subsequently, the electrodes and the
visible part of the sensor cap thread must
be cleared of particles clinging to them
under a stream of water
Maintenance and Repair
If rubbing down the electrodes and
ð
replacement of the electrolyte does
not result in successful calibration
under correct calibration conditions
then the senor must be returned for
repairs
8.1 Replacement intervals
The electrolyte has a limited lifetime and must be
replaced as soon as the sensor can no longer be
calibrated.
We recommend you replace the reference
system every 2-3 years, but at the latest when
white and/or silver discolouration is visible on the
reference system. The reference system can
only be replaced by ProMinent.
8.2 Repair
The sensor can only be repaired in the works.
Return it to us in its original packaging. Prepare
the sensor for this, as described above!
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