Fire alarm system

Communications: electrical – Condition responsive indicating system – With particular system function

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Details

340506, 340531, 340537, 340505, G08B 2900

Patent

active

048810606

ABSTRACT:
An improved alarm system and method for use in a fire detection system of the type including at least one sensor for sensing the level of a parameter of a fire condition such as heat or smoke density and which transmits electrical signals indicative of the sensed levels over a communication link. The alarm system and method provides for indicating a first alarm condition by receiving electrical signals from the sensor, keeping time from the time that the parameter reaches a first level, and indicating the first alarm condition when the parameter reaches a second level within a first predetermined time period. The second level has a magnitude greater than the first level. The alarm system and method also indicates a first alarm condition corresponding to a third level of the parameter prior to the third parameter level being reached. A clock keep time from the time that the parameter reaches the first level and alarm means indicates the first alarm condition when the parameter reaches the second level from the first level within a first predetermined time period. The second level has a magnitude greater than the first level and less than the third level.

REFERENCES:
patent: 4459583 (1984-07-01), van der Walt et al.
patent: 4517554 (1985-05-01), Moser et al.
patent: 4668939 (1987-05-01), Kimura et al.

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