IEC 61779-3 Ed. 1.0 en:1998, Electrical apparatus for the detection and measurement of flammable gases - Part 3: Performance requirements for group I ... a volume fraction up to 100 % methane in air

Specifies requirements for group I (as defined in part 1) portable, transportable and fixed apparatus for the detection and measurement of methane concentrations in mine air. The apparatus, or parts thereof, are intended for use in mines susceptible to firedamp. The requirements and test methods applicable to the apparatus covered by this standard are specified in part 1. This standard is restricted to apparatus intended for the detection and measurement of volume ratios of methane in air from a volume fraction of 0 % up to a volume fraction of 100 %. This title may contain less than 24 pages of technical content.