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 (IEC 61779-2:1998, modified); German version EN 61779-2:2000
可燃气体检测和测量用电气设备.第2部分:指示空气中甲烷体积分数不超过5%的I组设备的性能要求(IEC 61779-2-1998 修改);德文版EN 61779-2:2000