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Design and function
Fig. 2
Sensor
designs
DPD-1 reagent is normally used to
calibrate the CLE chlorine sensor.
However, this measuring method
always detects the sum of HOCl and
OCl
-
. Therefore the pH value must
be kept constant after calibration. If
the pH value has altered by more
than
±
0.2 since the previous
calibration the sensor must be
recalibrated. If the pH value of the
sample liquid cannot be kept
constant you should use a controller
which can automatically correct the
pH value of the chlorine signal.
4
5
6
7
8
9
10
11
0
20
40
60
80
100
OCl -
HOCl
pH-value
h
ypochlorous acid
HOCl %
Fig. 1
Electrode shaft
Tensioning ring
Membrane cap
Hose seal
Cable bush
PG-7-threaded connector
Adapter
2-wire-connector
Type CLE 3.1-mA
Membrane
cap cover
Vent hole
BA_DT_123_04_12_4spr.p65
20.04.2012, 7:08 Uhr
21