The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 18, 1992
Filed:
Sep. 12, 1990
Walter A Johnson, Big Bend, WI (US);
Other;
Abstract
A method for providing a real time measurement of the purity of one gas in a binary mixture of two known gases, which mixture also contains water vapor, applies principles of the fan laws and ideal gas laws in a manner whereby the volume percent purity of the gas may be calculated directly from measured fan differential pressure. The calculted purity is preferably corrected for variations in temperature and pressure. The method requires the determination and use of an appropriate fan constant based on the gas whose purity is to be measured and specific to the fan being used to circulate the gas mixture and the speed at which it operates. An appropriate adjustment factor for differences between design and measured speed may also be applied in acordance with the fan laws. The method is particularly well adapted to provide real time measurement of hydrogen gas purity in the cooling gas circulated inside a large synchronous AC generator and utilizing a microprocessor to provide a real time output of hydrogen gas purity. The principles underlying the method of the invention are also utilized to develop a correction factor to convert hydrogen purity measured from a dry gas mixture sample using a thermal gas analyzer to a true hydrogen purity. The method may further to applied to calculate actual water vapor content in a sample from which hydrogen purity was measured by a thermal gas analyzer.