Low - voltage switchgear and controlgear assemblies - part 4 : particular requirements for assemblies for construction sites iec 60439 - 4 : 2004 ; german version en 60439 - 4 : 2004 低压开关设备和控制设备组合装置.第4部分:施工现场用
It adopts a device consisting of smoke - sensor and temperature - sensor as fire - signal collection unit . the system can setup the alarm value for temperature and works with a high automatization degree and dependability 它采用感烟传感器及感温传感器的组合装置作为信息采集单元，可根据设定的温度值报警，自动化程度高、可靠性高。
This valve is a combined regulating and flow measurement device and must be installed with five diameters of straight pipe of the same nominal diameter as the valve and without intrusions upstream of the valve 这种阀门是一种调节和流量测量的组合装置，必须安装在与阀门公称通径一致的直线管路，长度为五倍直径的位置，使得阀门上游不会受到侵扰。
Low - voltage switchgear and controlgear assemblies ; part 3 : particular requirements for low - voltage switchgear and controlgear assemblies intended to be installed in places where unskilled persons have access for their use ; distribution boards ; amendment 1 低压开关设备和控制设备组合装置.第3部分:用于安装在非熟练人员可能进入使用的场所的低压开关设备和控制设备组合装置的特殊要求:配电盘.修改件1
Low - voltage switchgear and controlgear assemblies - part 3 : particular requirements for low - voltage switchgear and controlgear assemblies intended to be installed in places where unskilled persons have access for their use ; distribution boards ; amendment 2 低压开关设备和控制设备组合装置.第3部分:用于安装在非熟练人员可能进入使用的场所的低压开关设备和控制设备组合装置的特殊要求:配电盘.修改件2
