Servicing; Repairs - ProMinent DULCOTEST CDP 1 Betriebsanleitung

Servicing / Repairs
9
Service intervals daily / weekly depending upon application.
Servicing tasks
If it is no longer possible to calibrate the sensor to the D1C you can try to
clean the membrane.
Cleaning the membrane
You can remove small amounts of dirt by rinsing under a gently stream of
tap water. In all other cases you must replace the membrane cap.
Replacing the membrane cap
Firstly, unscrew the old membrane cap and rinse off as much of the
electrolyte gel clinging to it as possible under running water. The rest of the
gel can be removed with the aid of a soft paper handkerchief. Rub lightly
over the sensor, particularly the reference system (brown ring). Then fill a
new membrane cap with electrolyte gel and screw on (see 5 "Assembly").

10 Repairs

The sensor may be repaired only at the factory. Please return in its original
packaging. Prior to return, please carry out instructions as described in 11
"Decommissioning".
28

Servicing

IMPORTANT
• The sensor must be regularly serviced in order to avoid
exceeding dosage due to sensor failure.
• Observe applicable national directives for service
intervals.
Check the sensor display value on the controller using an appropriate
chlorine dioxide measuring system (e.g. Photometer DT 1: observe note
in 7 "Operation/Calibration").
If necessary recalibrate the sensor (see 7.2 "Calibration").
Check the DLG cup at regular intervals for dirt.
IMPORTANT
Never attempt to clean the membrane with acids/alkalis or
mechanical aids (brushes or similar).
If the sensor fails to calibrate after cleaning, you must
replace the membrane cap.
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