CONDUCTIVITY MEASURING DEVICE Russian patent published in 1995 - IPC

FIELD: conductivity measuring devices enabling elimination of the effect of polarized resistance of electrodes on electric conductivity measurement results irrespective of whether working surfaces of electrodes are identical or not. SUBSTANCE: measuring channel of conductivity measuring cell has five circuits and two assemblies one of which incorporates one lead of first, second, and third circuits, and second assembly has one lead of fourth and fifth circuits and also other lead of third circuit; electrodes are arranged on remaining leads of first, second, fourth, and fifth circuits. Device switch has four positions in one of which electrodes of first and fifth circuits are connected to impedance active component meter; with switch in second position, electrodes of fifth and fourth circuits are connected to this meter, in its third position, electrodes of fourth and second circuits, and in its fourth position, electrodes of second and first circuits are connected to this meter. EFFECT: improved measurement accuracy. 1 dwg