GB/T 20936.3-2009
可燃性气体探测用电气设备.第3部分:显示空气中甲烷体积含量至100%的I类探测器的性能要求
Electrical apparatus for the detection and measurement of flammable gases.Part 3:Performance requirements for group I apparatus indicating a volume fraction up to 100% methane in air
GBT20936.3-2009, GB20936.3-2009