Signalling of exceeding the established threshold values of pre-explosion concentration of combustible gases (methane or propane-butane mixture) in the air in residential, domestic, administrative, public and industrial premises, including boiler rooms of different capacity, equipped with gas burners operating on natural (GOST 5542-2014) or liquefied (GOST 20448-2018) gases. The principle of action is thermochemical.
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