Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1986-03-11
1987-08-18
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular system function
340522, 340511, 340628, 340632, 340691, 340692, 340384E, 34087016, G08B 1900, G08B 1710
Patent
active
046880216
ABSTRACT:
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).
REFERENCES:
patent: 3860919 (1975-01-01), Aker
patent: 4064507 (1977-12-01), Schmitz
patent: 4443791 (1984-04-01), Rissin et al.
patent: 4526028 (1985-07-01), Hubner
patent: 4586143 (1986-04-01), Kaneyasu et al.
Buck Robert H.
Cowan Kent G.
Doughty John P.
Marshall Stephen E.
BDC Electronics
Crosland Donnie L.
Howison Gregory M.
Mills Jerry W.
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