低压开关设备和控制设备.第5-2部分:控制电路装置和开关元件.近接开关

[中文适用范围]： IEC 60947的这一部分适用于感测金属和/或非金属物体存在的电感式和电容式接近开关、感测声音反射物体存在的超声波接近开关、感测物体和非金属物体存在的光电接近开关。机械磁性接近开关，通过磁场感应物体的存在。这些接近开关是独立的，具有半导体开关元件，旨在连接到额定电压不超过 250 V 50 Hz/60 Hz ac 或 300 V dc 的电路。覆盖带模拟输出的接近开关。本标准的目的是规定接近开关： – 定义； - 分类; - 特征; - 产品信息; – 正常服务、安装和运输条件； – 结构和性能要求； – 验证额定特性的测试。 [外文原描述]： This part of IEC 60947 applies to inductive and capacitive proximity switches that sense the presence of metallic and/or non-metallic objects, ultrasonic proximity switches that sense the presence of sound reflecting objects, photoelectric proximity switches that sense the presence of objects and non-mechanical magnetic proximity switches that sense the presence of objects with a magnetic field. These proximity switches are self-contained, have semiconductor switching elements(s) and are intended to be connected to circuits, the rated voltage of which does not exceed 250 V 50 Hz/60 Hz a.c. or 300 V d.c. This Standard is not intended to cover proximity switches with analogue outputs. The main changes with respect to the previous edition are as follows:-modification of Table 3;-modifications of voltage dips and voltage interruptions immunity tests, in Table 8;-modification of status of Annex A, now informative.