Ionization type fire detector

Details Ionization type fire detector Ionization type fire detector

1981-09-02

1983-12-27

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

250381, G08B 1710

Patent

active

044234112

ABSTRACT:
A single chamber ionization-type fire detector. The ionization current is directly amplified to provide a usable analogue signal by means of an operational amplifier which has a minimal effect in the ionization current. The operational amplifier is simultaneously employed to maintain a constant potential difference in the chamber so that the ionization current is not subjected to a fluctuating voltage. The amplified analogue signal drives a recorder and through analysis of the recorder output genuine fire alarm conditions can be distinguished from false alarm conditions.

REFERENCES:
patent: 2954474 (1960-09-01), Lawrence
patent: 3676678 (1972-07-01), Takahashi
patent: 3795904 (1974-03-01), Beyersdorf et al.
patent: 3964036 (1976-06-01), Adachi et al.

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