BS EN 50545-1-2011 停车场和隧道内毒性和可燃性气体探测和测量用电气设备.一氧化碳和氧化氮探测和测量用通用性能要求和检测方法
Electrical apparatus for the detection and measurement of toxic and combustible gases in car parks and tunnels. General performance requirements and test methods for the detection and measurement of carbon monoxide and nitrogen oxides