Inficon is short on the details in its brochure and manual. Please help fill in some needed details. CO2-- In this video, it shows CO2 analysis, but in the manual, it says CO2 calculated. Calculated is not the same as analysis. If calculated, using what and how? N2 is not used, not measured, or what? As much H2O is knocked out in the trap as possible and not measured. (sort of a given) So the CO and O2 are measured. The percentages shown are presumed to be "by volume", but what is included in that? Is CO2 (calc), N2 (calc), H2O (would have to be calc), CO2 in the water (calc), CO (measured), O2 (measured)? What is the typical sensor life?