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:
Jul. 09, 1985
Filed:
Oct. 31, 1983
Kenneth R Hall, College Station, TX (US);
James C Holste, Bryan, TX (US);
Precision Machine Products, Inc., Dallas, TX (US);
Abstract
An improved proportional gas flow sampler having a combined arrangement of channeled plugs in a main flow line and a sample flow line for obtaining proportionally constant flow samples. The channels in the main line plug have relatively equivalent hydraulic diameters and a substantially greater average cross-sectional area than the channels in the sample line plug. The hydraulic diameter of the sample line plug channels are, however, within an order of magnitude of the hydraulic diameter of the main line plug channels and in certain configurations, relatively equivalent. The pressure drop across the main line and sample line plugs is held constant to impose an equivalent flow impedance, even with proportionally greater flow through the main line plug. In this manner, the arrangement extracts a fixed fraction of the flow into the sample line regardless of overall flow rate. Downstream of the plugs, a control valve is disposed which is responsive to a differential pressure transducer to provide the equal pressure drop as the sample flow is extracted. The sample flow rate typically is a very small percentage of the flow in the main line which, in the present invention, is independent of the relative cross-sectional areas of the channels in the plugs. An advantageously high split is therefore possible in a manner independent of flow rate.