Sensor for measuring the electrical conductivity of a liquid medium

A displacement transducer for detecting the electrical conductivity of a liquid medium comprises a probe body (1) with a recess (2) which is at the onset of the probe body (1) from the medium can flow, at least one in the probe body (1) arranged printed circuit board (3) and at least two electrodes (4a, 4b), which are arranged on surfaces of at least one printed circuit board (3) in the recess (2) of the probe body (1) and face each other in this recess, being flow against the medium.