| 摘要 |
[Problem to be Solved] To advantageously ensure both early detection of a fire and prevention of a false alarm by giving a time lag between temporal detection properties of smoke density and gas concentration. [Solution] A detector 10 includes a smoke detecting section that includes a light-receiving unit 30 at a position at which the light-receiving unit 30 does not directly receive light emitted by a light-emitting unit 28 in a chamber 26 in which a labyrinth 32 for preventing light from directly entering from the outside and an insect net 34 covering the rim of the labyrinth 32 are provided, the light-receiving unit 30 receiving light scattered by smoke flowing into the chamber 26. An opening hole 28 is formed open in the surface of the cover 12 receiving hot air current, of the detector 10. In the cover 12 behind the opening hole 28, an electrochemical gas sensor 36 is placed to bring gas generated by a fire through the opening hole 28 into contact with an electrolyte solution to detect the gas by an electrode. |
