Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1997-05-09
2000-11-21
Pope, Daryl
Communications: electrical
Condition responsive indicating system
With particular system function
340507, 340508, 340521, 340523, 340525, G08B 2900
Patent
active
061509353
ABSTRACT:
An alarm system which incorporates a plurality of highly sensitive, early warning, smoke detectors incorporates functionality for distinguishing between detector signals in response to ambient smoke and detector signals in response to the presence of non-smoke, fibrous materials. Detectors are spatially arranged in predetermined regions. Information concerning the arrangement of detectors is stored in the common control unit. Additionally, a performance history for each of the detectors is also stored in the control unit. If one of the detectors exhibits a relatively large output which is large enough to indicate a possible fire, a previously stored history from the outputs of that detector is analyzed. If the previously stored history indicates a fire related profile, such as a relatively gradual increase in smoke level over a period of time, the signal from that detector is regarded as being indicative of smoke and an alarm is indicated. If the signal from the detector shows a relatively fast increase, from a very low level to an alarm level in a short period of time, fibrous material may have entered the detector. The output from at least one other detector in the same region is analyzed. If the second detector confirms the presence of smoke, at least the first detector is regarded as indicating an alarm condition. If the second detector does not indicate the presence of smoke, even a very low level of smoke, the output from the first detector is regarded as being due to a non-smoke condition, such as an intrusive fibrous material. The control unit indicates the presence of a trouble or maintenance condition with respect to that detector.
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patent: 5557262 (1996-09-01), Tice
Pittway Corporation
Pope Daryl
LandOfFree
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