Method of measuring carbon dioxide in a liquid or gas

Details Method of measuring carbon dioxide in a liquid or gas Method of measuring carbon dioxide in a liquid or gas

1980-07-21

1983-03-15

Kaplan, G. L.

Chemistry: electrical and wave energy

Processes and products

204195P, 422 26, G01N 2756, A61L 206

Patent

active

043766811

ABSTRACT:
A carbon dioxide sensor for measuring dissolved carbon dioxide or carbon dioxide in gas is sterilizable with steam under pressure at a temperature of 120-130 degrees Celsius. The sensor comprises an outer tube having on its one end a gas-permeable membrane and a pH electrode disposed in the outer tube and supporting a spacer of poor hydrophobicity so as to be positioned between the distal end of the electrode and the membrane. For measurement of carbon dioxide, a liquid containing sodium bicarbonate is poured into the outer tube to form a layer of electrolyte at the spacer, and the outer tube is mounted on a fermentor. The pH electrode can be removed from the outer tube which is attached to the fermentor, and a membrane protecting rod can be inserted into the outer tube for sterilization of the membrane. The gas-permeable membrane can easily be replaced.

REFERENCES:
patent: 3575836 (1971-04-01), Sternberg
patent: 3649505 (1972-03-01), Strickler et al.
patent: 3764504 (1973-10-01), Arff et al.
patent: 3853731 (1974-12-01), Gray et al.
patent: 4012308 (1977-03-01), Jerrold-Jones et al.
patent: 4078981 (1978-03-01), Neti et al.
John W. Severinghaus et al., J. Appl. Physiology, vol. 13, No. 3, pp. 515-520, (1958).
Richard W. Stow, Arch. Phys. Med. Rehabil., 38, pp. 646-650, (1957).

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