Measuring and testing – Instrument proving or calibrating – Gas or liquid analyzer
Reexamination Certificate
2006-12-26
2006-12-26
Williams, Hezron (Department: 2856)
Measuring and testing
Instrument proving or calibrating
Gas or liquid analyzer
Reexamination Certificate
active
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.
De Carteret Steven S.
Nagy Donald B.
DeVries Christopher
West Paul M.
Williams Hezron
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