Method of measuring the concentration of a dissolved gas in a fluid

Abstract

The invention pertains to a method for measuring the concentration of dissolved gases in a liquid [(39)], especially of CO.sub.2 in beverages, in which the liquid [(39)] is passed across the retentate side [(140)] of a membrane [(14)] that is at least partially permeable to the dissolved gas, and [in which] the volumetric flow of the permeated gas on permeate side [(16)] of the membrane [(14)] is determined, the temperature of the liquid [(39)] is measured, and the concentration of the dissolved gas in the liquid [(39)] is calculated from these values. In this, the thickness of the membrane [(14)] can be pre-selected as a function of the flow rate of the liquid [(39)] flowing along the retentate side [(140)].