METHOD AND APPARATUS FOR PROVIDING DILUTED EXHAUST GAS TO EXHAUST EMISSION ANALYZER

摘要

An apparatus for analyzing exhaust emissions by passing a fraction of a continuously extracted exhaust sample (122) combined with a pollutant-free diluent (156) through a system of critical flow orifices (140, 176, 202) at a predetermined and precisely controlled flow ratio. A diluted sample is produced having a dew point below ambient air temperature and satisfying the flow requirements of the analysis system.