Capacitive sensors, air dielectric as an RC oscillator which generates through the capacitive field. Capacitive field that enters the metal or non-metal objects, causes the change of permittivity levels. In this way, through the sensor to detect the change of oscillation frequency is made. Electrodes in the internal structure of the sensor, oscillator, and output layer consists of triggering. The potentiometer on the rear of the sensor via the sensing distance is adjustable.
*****
