Metered carbon di:oxide injection - by continuous sampling and using analyser to adjust metering valve

摘要

A plant for the continuous control of the injection of carbon dioxide in a liquid such as a beverage is based on an injector with a nozzle fed with the liquid, and a vacuum chamber connected to a carbon dioxide source. A sampling cylinder is connected to an automatic CO2 analyser which controls a metering valve in the carbon dioxide supply. This requires only a small sample to determine to CO2 content. The control quality is so good that the fluctuations of the CO2 content are held within plus-or-minus 0.07-0.08 vol.%.