Electrical apparatus for the detection and measurement of combustible gases; performance requirements for group II apparatus indicating up to 100 % lower explosive limit
国外标准现行
标准号:EN 50057-1991
标准名称: 可燃气体检测用电器.沼气指示范围达100%爆炸下限的第Ⅱ类电器的性能要求
英文名称:Electrical apparatus for the detection and measurement of combustible gases; performance requirements for group II apparatus indicating up to 100 % lower explosive limit