Patent ID: 6856248

Claim:
An alarm system, comprising a control panel; a local warning system electrically connected to said control panel; at least two sensors which are respectively installed at a plurality of detecting areas and electrically connected to said control panel; and a digital verification control, comprising: first means for verifying a single zone verification time in said control panel, wherein said single zone verification time is a single senor time del to delay an activation of said local warning system while one of said sensors is trigger; and second means for verifying a multiple zone verification time in said control panel corresponding to a distance between each two sensors at two different detecting areas, wherein said multiple zone verification time is a multiple senor time delay to delay said activation of said local warning system while said two sensors at two different detecting areas are triggered, wherein said multiple zone verification time is longer than said single zone verification time; thereby, when one of said sensors detects at least two triggered signals in said respective detecting area within said single zone verification time, said control panel is activated to activate said local warning system for producing a local warning signal and when two sensors detect two triggered signals in said detecting areas respectively within said multiple zone verification time, said control panel is activated to activate said local warning system for producing said local warning signal.