Respirator cartridge end-of-service life indicator

Details Respirator cartridge end-of-service life indicator Respirator cartridge end-of-service life indicator

1977-08-05

1979-03-27

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

338 34, 340633, 340636, 1281426, 422 96, G08B 1710, H01C 1300

Patent

active

041468872

ABSTRACT:
A gas or vapor sensing and alarm device in an air purifying respirator for warning the wearer of hazardous levels of gases or vapors penetrating through the respirator cartridge. An exothermic sensor which can be fitted in the cartridge adaptor or facepiece cavity of the respirator monitors the heat evolved during adsorption of the vapor or gas into the sensor's adsorbent and triggers in alarm when the respirator cartridge has reached the end of its service life.

REFERENCES:
patent: 2926249 (1960-02-01), Rogoff
patent: 3059443 (1962-10-01), Garner
patent: 3237181 (1966-02-01), Palmer
patent: 3400582 (1968-09-01), Warner
patent: 3476517 (1969-11-01), Smith
patent: 3911413 (1975-10-01), Wallace
patent: 3993983 (1976-11-01), Meiser

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