Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1986-04-21
1987-05-26
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular system function
340505, 340511, 340518, 340525, 3408251, 34082554, G08B 1900, G08B 2600
Patent
active
046689397
ABSTRACT:
An improved apparatus for detecting environmental disturbances such as the occurrence of a fire, a gas leak or the like, includes a central processing unit and a plurality of terminal detectors, wherein an identification code is assigned to each of the detectors and the central processing unit sequentially calls the detectors in rotation requesting them to transmit thereto the data collected on smoke concentration, gas concentration, temperature or the like. The apparatus is provided with a display unit and a memory. Data collected by each detector concerning on the environmental condition of the place where each detector is installed are stored in the memory in time series. When a signal for data exceeding a fixed reference level is received, a provisional alarm is raised for the operator and the stored data for a limited period of time in the past are displayed. The operator, upon noticing the alarm, reads the displayed data and judges whether a disturbance, a fire for instance, has occurred basing his judgment on his interpretation of the pattern of the past data in the light of the specific characteristics of said detector and the place where the detector is installed, and, when he judges that a disturbance has occurred, he manually issues a general alarm.
REFERENCES:
patent: 3665399 (1972-05-01), Zehr et al.
patent: 3676878 (1972-07-01), Linder
patent: 4001785 (1977-01-01), Miyazaki et al.
patent: 4067008 (1978-01-01), Sprowls, III
Kimura Tetsuo
Tanaka Seiichi
Crosland Donnie L.
Nittan Company Limited
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