JUMO 202931, Руководство по эксплуатации, Страница: 7 / 20

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1 Introduction
1.6 Function
The measuring sensors have two pairs of electrodes. The transmitter applies alternating current at the
outer pair of electrodes. A voltage is released at the inner electrodes - subject to the conductivity of the
measuring material. The transmitter acquires the voltage and uses it to calculate the electrolytic conduc-
tivity value. Functionally, excitation and measurement are kept separate. This has some advantages
compared to 2-electrode measuring sensors, as the effects of polarization recede into the background.
To a large extent, incoming resistances are automatically compensated. Measurement errors as a result
of contamination or deposits, are reduced.
1.7 Arrangement of the electrodes in the sensor measuring insert
voltage/current
voltage
current/voltage
control
voltage measurement
(1) (4)
(2) (3)
Figure Label Function
A2 Outer electrode 2
I2 Inner electrode 2
A1 Outer electrode 1
I1 Inner electrode 1