Capacitive sensors with extreme long sensing distance

The capacitive sensors with extreme long sensing distance are based on the three electrode measuring principle. This measuring principle allows much larger sensing distances compared to the two electrode principle of common capacitive sensors (KAS), up to 10-times the norm. Although one achieves essentially larger switching distances with these capacitive systems, the size of the sensors is small. These systems are used for applications where the sensing distances of standard sensors are not sufficient. A further feature is the Duplex- or Triplex-operation. With the corresponding evaluation unit it is possible to adjust 1, 2 or 3 switching points with only one sensor.