Title:
COMPLEX FIRE SENSOR
Document Type and Number:
Japanese Patent JP3120127
Kind Code:
B2
Abstract:
PURPOSE: To provide the fire sensor which functions to detect a fire and is increased in sensitivity only when watching out to eliminate misalarming.
CONSTITUTION: This fire sensor has a smoke sensing circuit 101 which senses smoke, a flame detecting circuit 11 which detects flames, and a timer circuit 12 which counts a specific time after the flame detecting circuit 11 detects the flames. Further, this sensor has a comparing circuit 13 which increases the sensitivity to the smoke by decreasing the threshold value until the timer circuit 12 counts up to the specific time after the flame detecting circuit 11 detects the flames. Furthermore, the sensor is equipped with a fire signal sending circuit 103 which outputs a fire alarm signal once receiving the fire decision signal outputted by the comparing circuit 13.
Inventors:
Takeshi Wada
Application Number:
JP30679991A
Publication Date:
December 25, 2000
Filing Date:
October 24, 1991
Export Citation:
Assignee:
MATSUSHITA ELECTRIC WORKS,LTD.
International Classes:
G01K7/00; G01N21/53; G08B17/10; (IPC1-7): G08B17/10; G01K7/00
Domestic Patent References:
| JP6381594A | ||||
| JP6092390U | ||||
| JP6092385U |
Attorney, Agent or Firm:
Hiroyuki Nakai
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