Fluid sampler and gas flow control system and method

Details Fluid sampler and gas flow control system and method Fluid sampler and gas flow control system and method

1983-07-12

1985-08-06

Levy, Stewart J.

Measuring and testing

Sampler, sample handling, etc.

Automatic control

7386321, 7386323, 7386434, G01N 124

Patent

active

045328145

ABSTRACT:
The fluid Sampler is used to sample gases in a collecting device and includes a flow control valve having a manually adjustable flow restricting orifice and a vacuum pump for drawing gas from the atmosphere through the collecting device and flow control valve to form therethrough a primary flow path. A flow controller is used to supply a supplemental flow of gas taken from the discharge end of the vacuum pump and supplied to the suction end of the vacuum pump in response to the differential in pressure across the flow control valve. The supplementary flow rate is automatically adjusted to maintain the differential in pressure constant.

REFERENCES:
patent: 2693114 (1954-11-01), Tapp et al.
patent: 2819774 (1958-01-01), Schmidt et al.
patent: 2982131 (1961-05-01), Rosinski
patent: 3343217 (1967-09-01), Daubenberger
patent: 3501899 (1970-03-01), Allen
patent: 3689197 (1972-09-01), Berle et al.
patent: 3965747 (1976-06-01), McCorkle
patent: 4140436 (1979-02-01), Schumacher et al.
patent: 4246788 (1981-01-01), Olin et al.
patent: 4269059 (1981-05-01), Baker
patent: 4432248 (1984-02-01), Lalin

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