Patent ID: 8581575
Filing Date: 2013-11-12
Classification: G01N

Abstract:
1. An inductively working sensor for determining the conductivity of a liquid medium, comprises: at least one transmitting circuit, which is designed to deliver an input signal for a transmitting coil, in order to produce in the transmitting coil an alternating electromagnetic field, which causes a ring-shaped electrical current in the liquid medium; at least one receiving circuit, which is designed to evaluate a received signal produced by the ring-shaped electrical current in a receiving coil; a first coil; and a second coil arranged at a distance from said first coil; and switching means for switching between a first switch state and a second switch state, wherein: in said first switch state, said first coil, serving as a transmitting coil, is coupled with said at least one transmitting circuit, and said second coil, serving as a receiving coil, is coupled with said at least one receiving circuit; and in said second switch state, said second coil, serving as a transmitting coil, is coupled with said at least one transmitting circuit, and said first coil, serving as receiving coil is coupled with said at least one receiving circuit.