method and device for evacuating a chamber

摘要

The method for evacuating a chamber (104) filled with a protective gas, especially the sealing chamber of a packing machine (102), comprises evacuating a buffer volume (115) of gas. The concentration of one or more components of the gas is then measured. Alternatively the chamber is connected to a vacuum source and the concentration of the components is measured in the gas stream flowing to it : Independent claims are included for apparatus for carrying out the two variants of the method.