Measuring and testing – Gas analysis – Moisture content or vapor pressure
Patent
1991-11-04
1993-09-07
Williams, Hezron E.
Measuring and testing
Gas analysis
Moisture content or vapor pressure
G01N 2526
Patent
active
052418510
ABSTRACT:
The present invention provides a method of performing an instantaneous moisture concentration measurement of a gas having a rapidly changing moisture concentration. This method has direct application to a method of determining the drydown characteristics of an environment in which a series of instantaneous moisture concentration measurements are made during the drying of the environment. In accordance with the present invention, a standard gas is generated having a known moisture concentration estimated to be essentially equal to the instantaneous moisture concentration of the gaseous fluid (which could be a purge gas used in drying an environment) at a selected instant of its rapidly changing moisture concentration. The standard gas is then sampled. At the selected instant, the gaseous fluid is sampled and its instantaneous moisture concentration is compared with the known moisture content of the standard gas. If essentially no difference exists, the known moisture will be essentially equal to the instantaneous moisture concentration. If a difference exits, the standard gas can be successively reformed with the known moisture concentration adjusted to eliminate the difference and thus provide an indirect measurement of the moisture concentration within the gas.
REFERENCES:
patent: 3665748 (1972-05-01), Mator
patent: 4131011 (1978-12-01), Ling
Berger Henry
Tapp Frederick
Cassett Larry R.
Rosenblum David M.
Roskos Joseph W.
The BOC Group Inc.
Williams Hezron E.
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