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    SCHMERSAL無源接近開關(guān)不需要電源，通過磁力感應控制開關(guān)的閉合狀態(tài)。當磁 或者鐵質(zhì)觸發(fā)器靠近開關(guān)磁場時，和開關(guān)內(nèi)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(guān)有以下幾種：

    德國施邁賽渦流式接近開關(guān)有時也叫電感式接近開關(guān)。它是利用導電物體在接近這個能產(chǎn)生電磁場接近開關(guān)時，使物體內(nèi)部產(chǎn)生渦流。這個渦流反作用到接近開關(guān)，使開關(guān)內(nèi)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(guān)的通或斷。這種接近開關(guān)所能檢測的物體必須是導電體。

    SCHMERSAL霍爾接近開關(guān)當磁性物件移近霍爾開關(guān)時，開關(guān)檢測面上的霍爾元件因產(chǎn)生霍爾效應而使開關(guān)內(nèi)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(guān)的通或斷。這種接近開關(guān)的檢測對象必須是磁性物體。

    德國*SCHMERSAL光電式接近開關(guān)利用光電效應做成的開關(guān)叫光電開關(guān)。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(nèi)。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(guān)，施邁賽安全開關(guān)

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