Fire detecting system

Details Fire detecting system Fire detecting system

1989-06-09

1990-12-04

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340522, 340567, 340629, G08B 1700

Patent

active

049756842

ABSTRACT:
A fire detector having a first sensor for emitting a first output signal in response to a fire phenomenon, a second sensor for detecting a source of false alarm conditions generated by man and/or machinery and an evaluating circuit. The evaluating circuit has a mechanism for activating an alarm signal when the value of the output of the first sensor exceeds a threshold value. The threshold value is set by the second sensor in response to the detection of signals generated during normal use of the premises to be protected.

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