Traditional (plastic-face) proximity sensors detect metal by inducing a high frequency signal on an internal copper coil wound around a ferrite. While high frequencies conduct well on a metal objects' surface, properly calculated low frequencies can penetrate and even pass through non-ferrous metals such as stainless steel. Manufactures are now coating the products with spatter-resistant surfaces to enable their use in welding environments (the ferrous weld spatter would otherwise bond to the stainless steel surface).
automation basics | Proximity sensors More than just a ‘sma
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