Title: Fluid sampling system

Abstract: Fluid, such as air, flowing through a duct is sampled by a detector in a chamber by withdrawing a portion of the fluid from the duct by an impact tube which connects the duct to an inlet in the sampling chamber. Several openings in the impact tube extend across the duct and face into the direction of fluid flow in order to obtain a cross-sectional and representative sample of the fluid. To insure that an adequate sample is obtained, one or more venturi tubes are also placed into the direction of the flow path of the fluid and these venturi tubes are connected to the outlet of the sampling chamber to exert a pressure in the chamber which is negative with respect to the chamber inlet from the impact tube.

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Inventors: Wolf, Harry (North Hollywood, CA, US)

Application Number: 865115
Filing Date: 1977-12-28
Publication_date: 1979-04-24
Assignee:
Primary Class(es): 73/863.58
Other Classes:
US Patent Ref:

2475857	Jul, 1949	Reinert	73/421.
2518574	Aug, 1950	Skopecek	73/422.
3369346	Feb, 1968	Wildbolz et al.	73/421.
3461727	Aug, 1969	Everhard et al.	73/421.
3538748	Nov, 1970	Linsell et al.	73/422.
3587323	Jun, 1971	Benjaminson et al.	73/421.
3765226	Oct, 1973	Strickland et al.	73/422.
3803921	Apr, 1974	Dieterich	73/422.
3965749	Jun, 1976	Hadden et al.	73/421.
4047437	Sep, 1977	Brooks	73/421.

Other Refs:
Primary Examiner: Gorenstein, Charles
Assistant Examiner:
Attorney: Sternfels; Lewis B.