DETECTION OF BLOCKAGES AND INTERRUPTIONS IN ASPIRATING SMOKE DETECTOR (ASD) Russian patent published in 2014 - IPC G08B17/10 

FIELD: physics, signalling.

SUBSTANCE: invention relates to an aspirating smoke detector (ASD). The invention relates to a method and a corresponding ASD for detecting blockages and interruptions in a pipe system (1). Air is aspirated by means of a ventilator (3) through the pipe system (1) from rooms and structures to be monitored and monitored for any characteristics of fire. The air flow ( $$\dot{V}$$ , $$\dot{m}$$ ) of at least part of the aspirated air and air temperature (T) is measured. A blockage alarm (V) is output, if the air flow ( $$\dot{V}$$ , $$\dot{m}$$ ) falls below a predetermined lower limit value ( $$\dot{V}$$ -, $$\dot{m}$$ -) and/or an interruption alarm (U) is output, if the air flow ( $$\dot{V}$$ , $$\dot{m}$$ ) rises above a predetermined upper limit value ( $$\dot{V}$$ +, $$\dot{m}$$ +). According to the invention, the number (n) of rotations of the ventilator increases as the air temperature (T) rises and decreases as the air temperature (T) drops.

EFFECT: simplification and providing more dynamic monitoring.

15 cl, 5 dwg