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:
May. 08, 1984
Filed:
Nov. 27, 1981
William H Clingman, Dallas, TX (US);
Kenneth R Hall, College Station, TX (US);
Precision Machine Products, Inc., Dallas, TX (US);
Abstract
Disclosed is an improved proportional gas flow sampler having a combined arrangement of baffles with orifice plates for obtaining proportional flow sampling. Orifice plates may be used alone for this purpose and baffles also may be used alone, but by combining the two, the disadvantages of each are overcome. A spool piece is inserted in the main gas line. In this spool piece a baffle arrangement extracts a fixed fraction of the flow into a bypass line. Downstream of the baffles there are orifice plates in both the main line and the by-pass line. Just upstream of one orifice plate or the other, depending on the gas flow rate, the sample flow is extracted. The sample flow rate typically is a very small percentage of the flow in the main line. The sample flow line also contains an orifice plate. Just upstream of it is a fan and downstream is a control valve. An electronic controller adjusts this valve and fan so that the upstream and downstream pressures at this orifice plate match the corresponding orifice plate pressures in either the main line or by-pass line. When the pressure match is obtained, the sample line flow rate is a reproducible selected fraction of the flow rate in the main line.