Patent ID: 6384731
Filing Date: 2002-05-07
Classification: G08B

Abstract:
A fire event detection system, comprising:an alarm; a logic circuit capable of evaluating resistance input data supplied thereto, said circuit including means for generating an output signal to energize said alarm; a pair of electrical conductors spaced apart and extending parallel to one another, each conductor electrically connected to said circuit for providing said resistance input data thereto; a power source for said circuit and alarm; a solid conductive PTCR polymeric tape having opposed longitudinal edges in contact with said pair of electrical conductors and spanning therebetween, said PCTR polymeric tape defining a plurality of temperature sensing cells configured in series therealong, said PTCR polymeric tape being conductive and capable of a sharp increase in electrical resistance at a predetermined temperature at any single sensing cell where said predetermined temperature occurs; said pair of conductors providing said resistance input data to said circuit for evaluation indicative of a resistance of said PTCR polymeric tape, said circuit including means for comparing said resistance with a predetermined parameter, said circuit generating said signal for energizing said alarm if said evaluated resistance input data indicates a resistance greater than said predetermined resistance parameter.