Abstract: A probe assembly for processing an outlet gas from a gas analyzer. The probe assembly has a thermowell and a heating element mounted in the thermowell connecting to a power connection, wherein the heating element heats the thermowell. The probe assembly has a one piece non-sintered metal probe with an end cap smaller than a tubular body inner diameter, a plurality of upper longitudinal outer grooves and a plurality of longitudinal slots, or a plurality of perforations. The probe assembly has a street tee with an inlet port to receive outlet gas from the gas analyzer and a sintered metal outer housing, through a catalyst cartridge for reaction. This reaction produces water vapor and carbon dioxide while simultaneously allowing ambient air to enter the catalyst cartridge while exhausting water vapor and carbon dioxide at a continuous flow rate.