Electrical apparatus for the detection and measurement of combustible gases - Performance requirements for Group I apparatus indicating up to 100 % (v/v) methane in air

1.1 This European Standard specifies performance requirements for Group I (as defined in European Standard EN 50054) portable, troansportable 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 and shall meet the general requirements and test methods specified in European Standard EN 50054. NOTE. The use of Group I apparatus may not be permitted without the additional and prior approval of the relevant authority in mines under it juridiction, see Note 1 under Clause 1.1 of European Standards EN 50054. 1.2 This European Standard is restricted to apparatus intended for the detection and measurement of volume ratios of methane in air from 0 % (v/v) up to 100 % (v/v). NOTE. Apparatus covered by this European Standard will normally be intended to operate in volume ratios greater than 5 % (V/V).