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Function of
the sensor The PER sensor is a diaphragm-covered, amperometric two-
Construction of the
ProMinent
®
electrode
2000 ppm) or a carbon dioxide electrode (PER 1-mA-50 ppm,
PER 1-mA-200 ppm) is used as working electrode, a silver halide-
coated anode is used as counter and reference electrode.
The H
O
contained in the sample water diffuses through the dia-
2
2
phragm. The constant polarisation voltage between the two elec-
trodes causes the electrochemical reaction of the H
collector. The resulting current is measured as a primary signal
(amperometric measurement principle). This is proportional to the
concentration of H
electronic amplifier within the sensor converts the primary signal into
a temperature-compensated 4-20 mA output signal, which is
displayed at the DULCOMETER
H
O
.
2
2
Fig. 1
Cable entry M12
threaded connector
sensor
Upper section
2-wire connection
Terminal block
Electrode shaft
O-ring seal
Rubber seal
Diaphragm cap
Construction and function
sensor.
A
gold
O
within the operating range of the sensor. The
2
2
®
Counter and reference
electrode
Working electrode
electrode
(PER
D1C for the measured variable
O-ring seal
1-mA-
O
on the
2
2
29
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