Measuring and testing – Gas content of a liquid or a solid – By vibration
Patent
1982-03-11
1984-09-04
Kreitman, Stephen A.
Measuring and testing
Gas content of a liquid or a solid
By vibration
55158, G01N 710
Patent
active
044689489
ABSTRACT:
An apparatus and method for measuring the concentration of a gaseous or volatile substance in a liquid, which comprises passing a carrier gas through a liquid-repellent porous partition tubing, immersed in a liquid, having continuous minute channels extending through the tubing wall, introducing to a gas detector the gaseous volatile substance passing from the liquid into the carrier gas through the continuous minute channels while controlling the flow rate and the pressure of the carrier gas by simultaneously operating both a carrier gas control means and a choking means. Also disclosed is a method for the measurement of the same which is equipped with sterilization, calibration and standby function so that it may be immediately applied to an actual industrial scale process including cultivation of microorganisms, brewing and the like. Further disclosed are various measuring apparatus for the practicing of the foregoing methods. Porous partition tubing made of tetrafluoroethylene resin is used having an average pore size of about 0.1 to 1.0 .mu.m and a porosity of about 20 to 80%. The carrier gas is controlled to produce a specific pressure difference under certain conditions.
REFERENCES:
patent: 3087112 (1963-04-01), Pfefferle
patent: 3879984 (1975-04-01), Welland
patent: 4257257 (1981-03-01), Dairaku et al.
Kazuo Dairaku & Tsuneo Yamane, "Use of the Porous Teflon Method to Measure Gaseous or Volatile Substances Dissolved in Fermentation Liquids", Biotechnology and Bioengineering, vol. 21, 1979, pp. 1671-1676.
Kanegafuchi Kagaku Kogyo & Kabushiki Kaisha
Kreitman Stephen A.
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