Toxic gas detector system having convenient battery and sensor r

Details Toxic gas detector system having convenient battery and sensor r Toxic gas detector system having convenient battery and sensor r

1992-12-21

1994-01-18

Hofsass, Jeffrey

Communications: electrical

Condition responsive indicating system

Specific condition

340693, 340628, 429 96, 429 99, G08B 1710

Patent

active

052802736

ABSTRACT:
A detector system for sensing the presence of a toxic gas, such as carbon monoxide, and sounding an alarm. The presence of the gas is detected by passing light through a biomimetric sensing material that darkens in the presence of the gas. The system includes a housing containing a light emitter, a light detector and a mechanism for sounding an alarm. The sensing material is contained in a cell, which, together with a battery to power the system, are mounted in a drawer insertable into the housing, which has openings permitting ambient air to reach the sensing material. When fully inserted, the drawer positions the cell between the emitter and detector and brings battery contacts into connection with contact s for the light emitter and alarm. Both the battery and sensing material must be replaced periodically, typically about once every three years. The drawer is configured so that it cannot be inserted without a battery in place. Both the battery and cell are easily replaced in the drawer. A microporous filter is preferably placed between the cell and ambient air to prevent contamination by large airborne particles.

REFERENCES:
patent: 4152551 (1979-05-01), Hiller
patent: 4959640 (1990-09-01), Hall
patent: 5063164 (1991-11-01), Goldstein

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