推荐回答（3个）
接近开关是一种无 需与运动部件进行 机械直接接触而可 以操作的位置开关
更多图片(10张)
，当物体接近开关 的感应面到动作距离时，不需要机械 接触及施加任何压力即可使开关动作 ，从而驱动直流电器或给计算机（plc )装置提供控制指令。接近开关是种开 关型传感器（即无触点开关）
有行程开关、微动开关的特性，同时 具有传感性能，且动作可靠，性能稳 定，频率响应快，应用寿命长，抗干 扰能力强等、并具有防水、
腐蚀等特点。产品有电感式、
、霍尔式、交、直流型。
称无触点接近开关，是理想的电子开
当金属检测体接近开关 的感应区域，开关就能无接触，无压 力、无火花、迅速发出电气指令，准 确反应出运动机构的位置和行程，即 使用于一般的行程控制，其定位精度 、操作频率、使用寿命、
方便性和对恶劣环境的适用能力，是 一般机械式行程开关所不能相比的。 它广泛地应用于机床、
轻纺和印刷等行业。在自动控制系统 中可作为限位、计数、定位控制和自 动保护环节等。
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