Inductive Proximity switches are used to identify the presence of metal objects, speed measurments, position sensing, counting etc., without any physical contact with the objects. It enhances the durability of the switch and ensures maintenance free work. Inductive Proximity switch generates high frequency alternating field at the active face by the oscillator circuit. When any metal object is brought into the field it causes oscillation to stop. Hence the demodulated voltage feeding the trigger disappears.