Gas detecting and measuring apparatus

Details Gas detecting and measuring apparatus Gas detecting and measuring apparatus

1980-05-13

1982-04-20

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

73 23, 204195R, 324 71R, G08B 1710, G01N 2746

Patent

active

043262007

ABSTRACT:
A gas detecting device e.g. for detecting CO.sub.2 in air, has a vessel containing water and a layer of ion-exchange resin wetted by the water and sandwiched between air and water-permeable electrode gauze discs. Any CO.sub.2 in the ambient atmosphere dissolves in the water and the dissociated ions lower the resistance between the electrodes which may be connected to a bridge circuit adjusted to be out of balance at a predetermined CO.sub.2 concentration or which may be of dissimilar metal to form a galvanic cell with a measurable output current at a predetermined CO.sub.2 concentration.

REFERENCES:
patent: 3349011 (1967-10-01), Hersch et al.
patent: 3591480 (1971-07-01), Neff et al.
patent: 3776832 (1973-12-01), Oswin et al.
patent: 3852169 (1974-12-01), Kring et al.
patent: 3878080 (1975-04-01), Luck
patent: 4049503 (1977-09-01), Becker et al.
patent: 4149948 (1979-04-01), Peterson et al.
patent: 4202748 (1980-05-01), Kroneisen
patent: 4209299 (1980-06-01), Carlson
British Journal of Anaesthesia, pp. 439-442, (1975) 47; "A New Method for the Measurement of Carbon Dioxide in the Expired Air", by Bushman et al.

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