Method and apparatus for gas dosing for linearization

Details Method and apparatus for gas dosing for linearization Method and apparatus for gas dosing for linearization

1979-11-16

1981-09-22

Kreitman, Stephen A.

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

G01N 3100

Patent

active

042902967

ABSTRACT:
A combustion analyzer for the analysis of the carbon and sulfur content in steel includes a gas flow system whereby a carrier gas flows through a combustion chamber and gaseous by-products of combustion flow through one or more infrared cells for analysis. In order to correct for the inherent nonlinearity of the measurement of concentration by the infrared cell or cells, a linearity correction system is provided. In the linearity correction system, discrete levels of concentration of known gases are dosed into the system and the detected concentration measured. Scaling factors are determined by an iterative process employing a microprocessor which scaling factors are then employed to correct for the nonlinearity in sample measurements. In one embodiment of the invention, the flow of the specimen gas employed for dosing the system is measured as a function of the pressure differential across a given size flow restrictor using an improved control valve and dosing manifold.

REFERENCES:
patent: 3776023 (1973-12-01), Budd et al.
patent: 3882713 (1975-05-01), Nishida et al.
patent: 3948281 (1976-04-01), Strain et al.
patent: 4177835 (1979-12-01), Paley
patent: 4191215 (1980-03-01), Gonner
K. J. Parkinson et al., "A New Method for Calibrating Infrared Gas Analysers", Journal of Physics E, pp. 598-600, vol. 4, Aug. 1971.

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