Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1995-11-02
1997-01-28
Hofsass, Jeffery
Communications: electrical
Condition responsive indicating system
Specific condition
340628, 250573, 250574, G08B 1710
Patent
active
055981470
ABSTRACT:
A smoke detecting apparatus for a fire alarm has a smoke chamber into which smoke to be detected is introduced, a light emitting lamp disposed in the smoke chamber, a light receiving element disposed in the smoke chamber so as to receive the light emitted from the light emitting lamp, an amplification device for amplifying an output signal from the light receiving element, a detection device for detecting the density of the smoke on the basis of an output signal from the amplification device, a comparison device for comparing the value of the output signal from the amplification device with a fixed value, an abnormality output device for outputting an abnormality indication when the value of the output signal from the amplification device is judged to be smaller than the fixed value by the comparison device, an augmentation command switch for commanding augmentation of the value of the output signal from the amplification device, and an augmentation device for augmenting, in accordance with a command from the augmentation command switch, the value of the output signal of the amplification device which is input to the comparison device.
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Ito Hideo
Kobayashi Ryousaku
Mochizuki Mikio
Hofsass Jeffery
Mannava Ashok
Nohmi Bosai Ltd.
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