Control of air parameters of the working zone of domestic, administrative, public, industrial premises and outdoor areas when connecting several alarm devices in a loop together with power supply and signalling units BPS-3. For issuing light and sound alarms on exceeding the established threshold values of the mass concentration of harmful substances, volume fraction of oxygen, combustible gases (natural GOST 5542-2014 and liquefied GOST 20448-2018) in the air of the working area. The principle of action is electrochemical and thermochemical.
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