Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1993-11-10
1996-09-03
Hofsass, Jeffery
Communications: electrical
Condition responsive indicating system
With particular system function
340501, 340511, 340587, 340588, G08B 2900
Patent
active
055527639
ABSTRACT:
A fire alarm system automatically adjusts sensitivity of individual sensors based on evaluation of background level over a period of time. High sensor signals which do not trigger a fire alarm may, after a delay time, result in decreased sensitivity to avoid false alarms. On the other hand, low peak values stored over a period on the order of months result in an automatic increase in sensitivity of the system. The sensitivity is adjusted by changing the delta threshold of an alarm threshold over a quiescent sensor signal average.
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Hofsass Jeffery
Simplex Time Recorder Company
Wu Daniel J.
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