SCHMERSAL無源接近開關不需要電源，通過磁力感應控制開關的閉合狀態。當磁 或者鐵質觸發器靠近開關磁場時，和開關內部磁力作用控制閉合。特點：不需要電源，非接觸式，免維護，環保。 因為SCHMERSAL位移傳感器可以根據不同的原理和不同的方法做成，而不同的位移傳感器對物體的“感知”方法也不同，所以常見的施邁賽接近開關有以下幾種： 德國施邁賽渦流式接近開關有時也叫電感式接近開關。它是利用導電物體在接近這個能產生電磁場接近開關時，使物體內部產生渦流。這個渦流反作用到接近開關，使開關內部電路參數發生變化，由此識別出有無導電物體移近，進而控制開關的通或斷。這種接近開關所能檢測的物體必須是導電體。 SCHMERSAL霍爾接近開關當磁性物件移近霍爾開關時，開關檢測面上的霍爾元件因產生霍爾效應而使開關內部電路狀態發生變化，由此識別附近有磁性物體存在，進而控制開關的通或斷。這種接近開關的檢測對象必須是磁性物體。 德國*SCHMERSAL光電式接近開關利用光電效應做成的開關叫光電開關。將發光器件與光電器件按一定方向裝在同一個檢測頭內。當有反光面（被檢測物體）接近時，光電器件接收到反射光后便在信號輸出，由此便可“感知”有物體接近。 上海維特銳直接從德國SCHMERSAL原廠家拿貨，直接供應各種SCHMERSAL感應傳感器，施邁賽磁性開關，施邁賽安全開關
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