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Grainger offers a wide selection of popular infrared, acoustic, capacitive and inductive proximity switches and proximity sensors to meet your manufacturing, robotics, and security application needs. A proximity switch opens or closes an electrical circuit when sensors detect objects within a certain distance. The type of material to be detected often requires the use of a specific type of proximity sensor. For example, an inductive proximity sensor is preferred for accurate, non-contact detection of metallic objects in machinery or automation equipment. A capacitive sensor can detect both conductive and non-conductive materials, but is most commonly used for sensing plastics, liquids, powders and granular materials. No matter what type of proximity switch or sensor you need, count on Grainger to carry it.