KS C IEC 61779-2-2003 可燃性气体的检测·测量的电气装置.第2部分:1组装置指示空气中甲烷含量达到容量的5%时的性能要求
Electrical apparatus for the detection and measurement of flammable gases-Part 2 : Performance requirements for group Iapparatus indicating a volume fraction up to 5% methane in air