FIRE SMOKE DETECTOR Russian patent published in 2011 - IPC G08B17/107 

FIELD: fire safety.

SUBSTANCE: radiators and radiation receivers are installed into optical channels made at least from plastic with various sizes of their installation along channel length, at the same time radiators and radiation receivers are pairwise installed in two planes arranged at least perpendicularly to each other so that they form a single working zone, where radiation patterns of radiators and radiation receivers cross, at the same time each of radiation receivers is used both to determine level of room smoke in combination with a radiator arranged in plane of this radiation receiver and to determine limit permissible level of dust concentration on surface of a protective transparent disc in combination with an additional radiator. At the same time the protective transparent disc is arranged in the form of at least two transparent plates, which cover the following: one plate - two optical channels with radiators installed in them; and the second plate - two optical channels with installed radiation receivers and one optical channel with an additional radiator installed in it.

EFFECT: improved noise immunity.

2 cl, 3 dwg