FORCED DILUTION SYSTEM AND METHOD FOR EMISSIONS MEASUREMENT SYSTEMS

摘要

The combination of ambient air, exhaust and premeasured calibration gases is used according to this invention in the analysis of either low or high pollutantconcentration gases measured by a single range analyzer. By using ambient air as a diluent and employing its concentration values to generate the Reference Dilution Ratio, DRref, iterative calculations are made to find the Raw Sample Concentration value, Craw. The gas diluting/mixing system includes pressure balanced infeed plumbing legs. Each of the legs feeds to respective flow restrictors and a common, downstream mixing "T" fitting. One leg is interconnected to the high concentration emission gas output from the sampling system and high concentration calibration gas. The other leg is interconnected to the diluent gas source, ambient air.