Patent ID: 7908904
Filing Date: 2011-03-22
Classification: A62C,G01M

Abstract:
1. Method for determining the air tightness of enclosed spaces, including the following procedural steps: a) adjusting a concentration gradient between the internal air atmosphere in an enclosed space and the atmosphere of the air surrounding the enclosed space, such that a concentration of oxygen in the internal air atmosphere in the enclosed space is at a value that differs from the concentration of oxygen in the atmosphere of the air surrounding the enclosed space; b) determining a concentration change rate by measuring in the internal air atmosphere in the enclosed space the time-related change of the concentration of oxygen; and c) calculating an air-tightness value of the enclosed space, taking into account the previously determined concentration change rate, whereby in procedural step a) the concentration gradient between the internal air atmosphere in the enclosed space and the atmosphere of the air surrounding the enclosed space is adjusted in that the oxygen content in the enclosed space is reduced by injecting an oxygen-displacing gas, and whereby in procedural step b) the concentration change rate is determined by measuring a time period during which the oxygen content in the internal air atmosphere in the enclosed space changes from a first preselectable value to a second preselectable value.