The Boc Group, Inc.

Linde Gmbh

Lesli B Cosey

Shuen-Cheng Hwang

David W Birch

Bruce D Wilson

Andre Micke

Carl W Schmidt

Andr&eacute; Micke

Robert F Phillips

D Bruce Wilson

Andrè Micke

Sheun-Cheng Hwang

Gas mixtures having precise compositions are prepared by separately pumping the components in liquid phase through piping, vaporizing the components, blending the components and analyzing the mixture for composition. A signal sent to a control unit causes any necessary change in the rate of pumping of the liquid components to reduce the difference between the measured concentration and the desired concentration. When the composition is within desired limits it is charged into gas cylinders.

Production of constant composition gas mixture streams

A system for filling gas cylinders with a gas mixture having a desired gas composition which includes (a) a gas conduit whose inlet end is connected to two or more gas component supply lines, each provided with a flow adjustment device, and whose outlet end is connected to a gas cylinder filling system, and which is equipped with a gas analyzer, a cumulative gas flow measuring device and, upstream of the gas analyzer, a gas mixing device; and (b) a controller which has provision for receiving signals from the flow measuring device and the gas analyzer and for sending signals to each flow adjustment device. A method of filling gas cylinders with given quantities of the gas mixtures which includes cumulatively measuring the quantity of gas flowing through the conduit, periodically analyzing the gas mixture flowing through the conduit, periodically sending cumulative gas flow information signals and gas analysis signals to the system controller, and periodically sending flow adjustment signals to the flow adjustment devices to minimize the difference between the actual gas composition and the desired gas composition.

Dynamic gas cylinder filling process

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West Chicago, IL, United States of America

Lesli B Cosey