Fire detector with a monitor circuit

Details Fire detector with a monitor circuit Fire detector with a monitor circuit

1979-02-05

1981-01-27

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340512, 340587, 340635, G08B 1700, G08B 2900

Patent

active

042478480

ABSTRACT:
In response to oscillator output pulses, a sample pulse generator supplies sample pulses to a fire sensor. In response to the sample pulses, the fire sensor produces a fire sensor signal. A judging circuit receives the fire sensor signals and, if they exceed a predetermined level, produces a judging pulse having a longer pulse duration than the oscillator pulses. This judging pulse is used to trigger an alarm signal. A monitor circuit consists of an AND gate and an OR gate. The AND gate receives as inputs the oscillator pulses and the judging pulses. The OR gate receives as inputs the output of the AND gate and the sample pulses. The output of the OR gate constitutes a monitor pulse that allows the simultaneous monitoring of three conditions, as follows:

REFERENCES:
patent: 3492589 (1970-01-01), Rotier
patent: 3787838 (1974-01-01), Feintuch et al.
patent: 4151522 (1979-04-01), Yamauchi

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