Forced dilution system and method for emissions measurement syst

Details Forced dilution system and method for emissions measurement syst Forced dilution system and method for emissions measurement syst

1996-08-23

1998-04-14

Raevis, Robert

Measuring and testing

Gas analysis

Gas of combustion

G01N 2126

Patent

active

057394130

ABSTRACT:
The combination of ambient air, exhaust and premeasured calibration gases is used according to this invention in the analysis of either low or high pollutant concentration 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, DR.sub.ref, iterative calculations are made to find the Raw Sample Concentration value, C.sub.raw. 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.

REFERENCES:
patent: 3833305 (1974-09-01), Porter et al.
patent: 4160373 (1979-07-01), Fastaia et al.
patent: 4586367 (1986-05-01), Lewis
patent: 5337595 (1994-08-01), Lewis

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