GB 20936.2-2009 可燃性气体探测用电气设备 第2部分:显示空气中甲烷体积含量至5%的I类探测器的性能要求 Electrical apparatus for the detection and measurement of flammable gases—Part 2:Performance requirements for group I apparatus indicating a volume fraction up to 5 % methane in air
Electrical apparatus for the detection and measurement of flammable gases—Part 2:Performance requirements for group I apparatus indicating a volume fraction up to 5 % methane in air