Pr
o
Minent
®
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pH/Chlorine
8.9.4
DULCOMETER
®
D2C Measured Variable Chlorine, DULCOTEST
®
CTE
Sensor for Total Chlorine and DULCOTEST
®
Sensor PHEP or PHER for
pH, Maintenance
Controller
The
DULCOMETER
®
controller type D2C for the measured variable pH/chlorine is maintenance-
free.
Sensor
DULCOTEST
®
CTE sensor for total chlorine
IMPORTANT
• Service the sensor regularly to avoid overdosing within a control system, due to in cor-
rect measured value.
• Observe the current national regulations for maintenance intervals.
• Do not touch the electrodes or allow them to come into contact with greasy substances.
• Never attempt to clean the membrane with acid/alkaline solutions, cleaning reagents or
mechanical aids (brushes or similar).
Maintenance interval
based on experience are:
• Potable, industrial, process
and cooling water:
depending on the specifi c conditions (1-4 weeks)
• Swimming pools:
weekly
• Spa pools (whirlpools):
daily
Maintenance
Work
Check the sensor regularly for dirt, algae and air bubbles. As far as possible, avoid contamina-
tion of the membrane with solid particles, deposits etc. Eliminate air bubbles by increasing the
fl ow rate.
Check the displayed sensor value on the controller regularly according to the DPD-4 method
using an appropriate chlorine measurement kit.
If necessary, recalibrate the sensor.
If calibration cannot be carried out properly, the membrane cap must be replaced and cali bra-
tion must be repeated.
DULCOTEST
®
Sensor PHEP or PHER for pH, Maintenance
IMPORTANT
The sensor is to be regularly serviced to avoid any excess metering caused by a sensor
failure!
Observe the valid national regulations for maintenance intervals!
Do not touch the electrodes or bring into contact with greasy substances!
Maintenance interval
monthly
Maintenance Work
The sensor should regularly (once a month) undergo a visual check and be cleaned if necessary.
If deposits on the glass electrode withstand cleaning with a soft, moistened cloth, the following
cleaning agents may be used:
Kind of deposit
Agent and duration of application
General deposits
Non-abrasive household cleaner
Scale or metal hydroxides
Diluted hydrochloric acid (approx. 0.1-3 %, 1-5 minutes)
Oil, grease
Solvents, like alcohol or acetone
Biofouling
Mixture of diluted hydrochloric acid and pepsin, several hours
Solvents (e.g. acetone) must not be used to clean electrodes as
they can demage the plastic stems.
It is essential that the sensor are rinsed thoroughly after having been cleaned.
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