Continuous automatic control of pre-explosive concentrations of combustible gases, vapours and their mixtures in the air of the working zone of premises and open areas and issuance of light alarm on exceeding the set threshold values. For continuous automatic control of pre-explosive concentrations of combustible gases, vapours and their mixtures in the air of the working zone of premises and open areas and issuing light alarms on exceeding the set threshold values. Principle of action - thermochemical.
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