Application requirements
As an alternative for the low-pressure chamber, a solution has to be found at atmospheric pressure where well-defined gas mixtures can be supplied. So air constituents such as oxygen, nitrogen and carbon dioxide have to be supplied independently from each other to a human test subject.
This supply has to be conducted in an accurate, repeatable and well-controlled way, to be sure that the desired N2/O2/CO2 mixture really has been supplied. Furthermore, a possibility to document the test conditions and results is required.