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Proximity sensors Proximity sensors are pilot devices used to detect the presence of an object without making any physical contact and are widely used in industrial automation for the detection of objects at a position. Proximity sensors are a non-contact type of solid-state electronic devices and are normally of eddy current type or inductive, capacitive or photoelectric proximity sensor. Inductive proximity sensor An inductive proximity sensor is a non-contact proximity sensor that can detect ferrous objects that contain iron, ideally mild steel thicker than one millimeter. Construction: An inductive proximity sensor is a non-contact proximity sensor that detects ferrous objects that contain iron, ideally mild steel thicker than one millimeter.  An inductive proximity sensor consists of four major components: a ferrite core with coils , an oscillator , a detector or signal conditioner , and an output amplifier all packed in a compact housing.   The oscillator creates a symmetrical