Continuous blending for gas analyzer calibration

Measuring and testing – Instrument proving or calibrating – Gas or liquid analyzer

Reexamination Certificate

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Reexamination Certificate

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07152454

ABSTRACT:
A method for calibrating a plurality of gas analyzers includes providing gas analyzers that measure the concentrations of gases. A span gas includes a mixture of the gases. A calibration mixture is supplied to the gas analyzers that includes the span gas and a non-reactive zero gas. At least one of a concentration of the non-reactive zero gas and a concentration of the span gas is varied in the calibration mixture as a function of time. The gas analyzers generate sets of readings of the concentrations of the gases. A controller generates response functions of the gas analyzers based on the sets of readings. The controller determines exact concentrations of the gases in the calibration mixture based on a set of readings from a gas analyzer with a predetermined response to a gas. The controller calibrates the gas analyzers based on the response functions and the exact concentrations.

REFERENCES:
patent: 3924442 (1975-12-01), Kerho et al.
patent: 5835974 (1998-11-01), Nagy
C.D. Paulsell, P.E., “The Use Of Exponential Dilution Flow in Gas Analyzer Calibrations”, U.S. Environmental Protection Agency, Ann Arbor, MI 48105.

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