ISO 10396:1993 PDF

The principle of the method specified is representative sampling of gases in a duct using two methods. In extractive sampling, the gases are conditioned to remove aerosols, particulate matter, and other interfering substances. In non-extractive sampling, the measurements are made in-situ, and no sample conditioning except filtering is required. The application is limited to the determination of O₂, CO₂, CO, SO₂, NO, NO₂. Although they are only mentioned briefly, detailed velocity measurements are required to determine the mass flow rates of gases.