| 摘要 |
Disclosed is a detector having a smoke density detection vs. time characteristic and a gas concentration detection vs. time characteristic which are displaced from each other, thereby having the advantages of both early detection of a fire and prevention of a false report of a fire. Specifically disclosed is a detector (10) provided with: a labyrinth (32) for shielding against external light to prevent the light from directly entering the detector; and a smoke detection unit for receiving on a light reception unit (30) light diffused by the smoke flowing into a chamber (26) which is provided with an insect net (34) covering the periphery of the labyrinth (32), wherein the light reception unit (30) is disposed in the chamber (26) so as not to directly receive the light emitted from a light emitting unit (28). A cover (12) of the detector (10) receives a thermal air current and has an opening (20) in the surface thereof. An electrochemical gas sensor (36), which brings gas generated by a fire into contact with an electrolyte solution through the opening (20) and thereby detects the gas by use of electrodes, is disposed within the cover (12) behind the opening (20). |
