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(tài)。當磁 或者鐵質觸發(fā)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(huán)保。 因為SCHMERSAL位移傳感器可以根據(jù)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(chǎn)生電磁場接近開關時，使物體內部產(chǎn)生渦流。這個渦流反作用到接近開關，使開關內部電路參數(shù)發(fā)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(chǎn)生霍爾效應而使開關內部電路狀態(tài)發(fā)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(fā)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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