Method and means for blended multi-component gas calibration and

Details Method and means for blended multi-component gas calibration and Method and means for blended multi-component gas calibration and

1994-08-22

1998-11-10

Raevis, Robert

Measuring and testing

Instrument proving or calibrating

Gas or liquid analyzer

G01N 3002

Patent

active

058359745

ABSTRACT:
A gas flow system for an emission analysis bench includes a source of blended calibration span gas using a single span tree connected with all the analyzers so that a method of simultaneous calibration or diagnosis of all the analyzers may be carried out and the need for multiple span trees connected with various separate span gases is avoided. The method includes concurrent delivery of one or more divisions of the span gases to all the analyzers to obtain intermediate data points from the analyzers. A further step of using a precalibrated or linear analyzer, such as the flame ionization detector (FID hydrocarbons analyzer) of the system, to accurately determine the percentage ratio of intermediate divide points obtained by mixing various amounts of zero gas with the span gas simplifies the calibration procedure and eliminates the need for an expensive gas divider.

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patent: 4498496 (1985-02-01), Barcellona et al.
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patent: 5239856 (1993-08-01), Mettes et al.
patent: 5285672 (1994-02-01), Yao
patent: 5333487 (1994-08-01), Kimura et al.
SAE Paper, 930141 "A Sampling System for the Measurement of PreCatalyst Emissions from Vehicles Operating Under Transient Conditions" McLeod et al Mar. 1-5, 1993.

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