7
2 Description
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
conductivity 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.
Measuring sensors
voltage/current
voltage
current/voltage
control
voltage measurement
(1)
(4)
(2)
(3)
Description
M12 connector pin
(1)
Current supply, outer electrode 1
6
(2)
Voltage tap, inner electrode 1
7
(3)
Voltage tap, inner electrode 2
3
(4)
Current supply, outer electrode 2
4
(5)
Pt1000 temperature probe
1, 2 and 5
(2)
(3)
(4)
(4)
(1)
(4)
(1)
(1)
(5)