发明名称 |
Combined smoke and gas detection apparatus |
摘要 |
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).
|
申请公布号 |
US4688021(A) |
申请公布日期 |
1987.08.18 |
申请号 |
US19860838469 |
申请日期 |
1986.03.11 |
申请人 |
BDC ELECTRONICS |
发明人 |
BUCK, ROBERT H.;COWAN, KENT G.;DOUGHTY, JOHN P.;MARSHALL, STEPHEN E. |
分类号 |
G01N27/12;G08B17/10;G08B17/11;G08B17/117;(IPC1-7):G08B19/00 |
主分类号 |
G01N27/12 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|