KS C IEC 61779-2-2003(2023) Electrical devices for detecting and measuring combustible gases - Part 2 Performance requirements for Group I devices for detecting methane volume fraction below 5%
2003KS C IEC 61779-2:2003 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