Multipoint monitoring of air parameters of the working zone of domestic, administrative, public, industrial premises and open areas, in particular food industry facilities, water treatment and water disposal, with the help of STG-3 signalling devices, power supply of STG-3 and STG-3-I signalling devices when they are connected in a loop, issuing of light and sound alarm when any signalling device in the loop is triggered with simultaneous switching of "dry" relay contacts at two thresholds.
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