Vorrichtung zur Erzeugung eines Prüfgases

摘要

A device for generating a test gas e.g., ethanol has at least two series-connected containers, which are filled with a calibration solution. A carrier gas, which is enriched with the calibration substance present in the solution corresponding to the vapor pressure of the calibration substance at the given temperature, is passed through these calibration containers. To prevent or to reduce the depletion of the components necessary for the gaseous calibration substance in the calibration solution, a defined amount of a stock solution is fed through the calibration containers in counterflow to the direction of delivery of the carrier gas.