Fire detector system and method

Details Fire detector system and method Fire detector system and method

G - Physics

08

B

G08B 17/113 (2006.01) G08B 17/11 (2006.01) G08B 29/18 (2006.01)

Patent

CA 2056768

ABSTRACT OF THE DISCLOSURE A fire detector system including ionization smoke detectors (7) is provided with improved false-alarm protection. The system includes an ionization chamber (1) with a radioactive source (10), connected in series with a resistor (2) between power supply lines (8, 9), and circuitry (11, 28) for switching the operating voltage of the ionization chamber between a normal operating value (Ut) chosen for maximized detector sensitivity, and an elevated value (Uh) for operation at current saturation. Comparisons involving the ionization currents through the ionization chamber at the two operating voltages are used not only to recognize a condition of partial shielding of the radio- active source (due to condensation, for example), but also to detect smoke under such conditions. 1432 -23-

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