Combined smoke and gas detection apparatus

Details Combined smoke and gas detection apparatus Combined smoke and gas detection apparatus

G - Physics

08

B

340/102, 340/147

G08B 19/00 (2006.01) G01N 27/12 (2006.01) G08B 17/10 (2006.01) G08B 17/11 (2006.01) G08B 17/117 (2006.01)

Patent

CA 1272262

COMBINED SMOKE AND GAS DETECTION APPARATUS ABSTRACT OF THE INVENTION A combined smoke and gas detector utilizes a conventional smoke detector IC (44) which is operable to drive a piezo element (46) and an LED (94) to provide indication of a smoke or gas detection. An ionization chamber (58) is operable to detect smoke and a gas detector (98) is operable to detect gas. A comparator (104) detects the output of the gas detector (98) for input to the logic circuitry of the IC (44). The LED (94) is modulated to provide a distinction between gas detection and smoke detection in addition to the tone output from the piezo element (46)

531630

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