Smoke detector

Details Smoke detector Smoke detector

1978-01-12

1980-06-03

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

250574, 250205, 356438, G08B 1710, G01J 132, G01N 2126

Patent

active

042064562

ABSTRACT:
A photo-electric smoke detector operating on the reflected light principle which has a rate detector for detecting the rate of increase of smoke concentration. When the rate exceeds a predetermined value, the rate detector causes the intensity of the smoke detector light source to increase, thereby increasing the sensitivity of the detector. In one embodiment of the invention, after the intensity of the light has been increased by the rate detector, it is maintained at the higher intensity for a predetermined time, even if the rate of increase of smoke concentration falls below the predetermined value.

REFERENCES:
patent: 2912685 (1959-11-01), Thomas
patent: 3562534 (1971-02-01), Jarrett et al.
patent: 3715720 (1973-02-01), Jehle
patent: 3789383 (1974-01-01), Vasel

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