Capacitive Proximity Sensor is designed to detect, and react to any object which moves into the operating zone. The sensor contains an oscillator. The capacitance of this oscillator is linked with the sensing face and when any object moves into the operating zone, its capacitance activates the oscillator. The sensor can detect conductive as well as non conductive material. It is advisable to have an object with permittivity more than one. The conductive objects are generally to be earthed for better results.