Measuring and testing – Sampler – sample handling – etc. – Automatic control
Patent
1981-11-27
1984-05-08
Swisher, S. Clement
Measuring and testing
Sampler, sample handling, etc.
Automatic control
7386361, G01N 122
Patent
active
044467486
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.
REFERENCES:
patent: 2309625 (1943-02-01), Cantrell, Jr.
patent: 3377867 (1968-04-01), Nitesen
patent: 3930414 (1976-01-01), Russel
patent: 4246788 (1981-01-01), Olin et al.
Clingman William H.
Hall Kenneth R.
Cantrell Thomas L.
Moore Stanley R.
Noland Tom
Precision Machine Products, Inc.
Schley Joseph H.
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