Can a Divesoft analyzer measure gases other than O2, He and air?
Older Divesoft analyzer firmware is intended for air/nitrogen, oxygen and helium mixtures; other gases can make results unreliable unless specifically supported.
Firmware versions prior to 2.19: No. The analyzer is intended only for mixtures containing air (more precisely, nitrogen with characteristic presence of atmospheric argon), oxygen and helium. The presense of another gas (e.g., a larger amount of CO2) in the mixture causes unreliable results. Under certain conditions, the analyzer can be modified for mixtures containing other gases. More information about the possibilities of modification and calibration can be obtained from the manufacturer.
Firware versions 2.19 and later have special "Gas purity" mode, which can measure any binary gas mixture, if sound velicities in each component are different enough. You have to define physical parameters of each component (both specific heats Cp and Cv and molar mass). If fact, a component can be a mixture, but each must contain different gases. Default setting measures Ar and air.