DS DS/EN 50056
DS DSEN 50056 2000-AUG-29 Electrcal apparatus for the detecton and measurement of combustble gases - Performance requrements for Group apparatus ndcatng up to 100 vv methane n ar Replaced by DS DSEN 61779-3
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This European Standard specifies performance requirements for Group I (as defined in European Standard EN 50054) portable, transportable and fixed apparatus for the detection and measurement of methane concentrations in mine air.