A probe mounted directly to a conduit conveying a process stream of gas to be analyzed, which can condition a continuous sample of the gas before it is analyzed by removing undesirable vapor components of the sample through interaction with a heat exchanger conduit which condenses these components into a liquid such that they precipitate under the force of gravity back into the process stream. The probe uses a Venturi device to motivate the gas through a flow cell chamber where it interacts with light shown through the chamber before ejecting the sample back into the process stream through a sample return conduit.