关键词:
控制装置
定义
电气连接件用接口
低压开关设备
近接开关
接近开关
传感器
信号变换器
开关设备
开关操纵元件
测试
标准号:
BS EN 50227-1999
摘要:
This standard applies to proximity sensors connected for operation by a two-wire connecting conductor to the control input of a switching amplifier. The switching amplifier contains a d.c. source to supply the control circuit and is controlled by the variable internal resistance of the proximity sensor. NOTE 1 These devices can be used in an explosive atmosphere if they also comply with EN 50020, Electrical equipment for explosive atmospheres, intrinsic safety "i". NOTE 2 These devices have been defined by the German organization "Normenausschuβ fur Meβ-und Regelungstechnik (NAMUR)".