Capacitive Proximity Switches

Introduction  The capacitive proximity switches are used for sensing metallic as well as non metallic material.   The Major Applications of Capacitive Switches   • Liquid level / Plastic Granules/ Component /Sand / Bulk Material Level • Food /Grain / Paper & Rubber/ Glass Industries  Working Principle   The switches works on the principle of resonant oscillator circuit. Two brass plates are used as electrodes of capacitor & the sensing objects acts as a dielectric media. The change in capacitance the object is sensed by a sensing circuit and output signal is generated