Fire detector and fire receiver

Details Fire detector and fire receiver Fire detector and fire receiver

1995-03-07

1997-05-06

Mullen, Thomas

Communications: electrical

Condition responsive indicating system

With particular system function

340500, 340505, 340506, 340511, 340588, 340589, 340514, G08B 2900

Patent

active

056275145

ABSTRACT:
A fire detector is capable of self-detecting its own malfunction and is also capable of quickly announcing a failure of high-level emergency in the fire detector. A plurality of determining values are established for the output level of a physical quantity detector for detecting the physical quantity of a fire phenomenon such as smoke, and a different time is set for each of the determining values. A shorter time is set for greater deviation from the normal value of the output level. It is determined that the physical quantity detector is faulty if it is detected that the output level of the physical quantity detector continuously exceeds any of the established determining values for not less than the time which has been set for that particular determining value.

REFERENCES:
patent: 4611197 (1986-09-01), Sansky
patent: 5084825 (1992-01-01), Kelly et al.

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