The classic sensor for detecting metal objects: maintenance-free measuring principle, high frequencies and very small dimensions. Baumer inductive proximity switches are non-contact electronic sensors. Inductive sensors will recognize any conducting metal target. The oscillator creates a high frequency electromagnetic field, which radiates from the sensing face of the switch. When a conductive metal object enters this electromagnetic field, eddy currents are induced within the metal, causing a change in the amplitude of the oscillations. The result is a voltage change at the output of the oscillator, which causes the trigger to change state and alter the output state.