德国*SCHMERSAL光电式接近开关利用光电效应做成的开关叫光电开关。将发光器件与光电器件按一定方向装在同一个检测头内。当有反光面（被检测物体）接近时，光电器件接收到反射光后便在信号输出，由此便可“感知”有物体接近。

    在SCHMERSAL接近开关内设有振荡器谐振电路，它是利用一个开放式的线圈产生定向高频电磁（ RF ）场，穿透传感器工作端面传出来。如果一个金属目标进入这一区域，开关感应产生的涡电流因此降低。感应涡电流从 LC电路中吸收能量（L：线圈 C ：电容器） 。振荡电路中的负载在振幅上产生一个衰减值，振荡减弱。

    上海维特锐直接从德国SCHMERSAL原厂家拿货，直接供应各种SCHMERSAL感应传感器，施迈赛磁性开关，施迈赛安全开关

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