Measuring and testing – Sampler – sample handling – etc. – Withdrawing through conduit or receptacle wall
Patent
1990-09-04
1991-10-22
Raevis, Robert
Measuring and testing
Sampler, sample handling, etc.
Withdrawing through conduit or receptacle wall
G01N 100
Patent
active
050584405
ABSTRACT:
A gas sampling device includes a dilution tunnel of particularly effective construction that reduces contamination or soiling of the ducting leading to a filter assembly and improves the accuracy of the results. The gas sampling device has a sampling probe disposable in the gas stream of an engine or the like, and a controlled source of clean and pressurized diluent air. The dilution tunnel includes an air distribution tube defining a plurality of distribution holes therethrough, a collar defining a first annular chamber about the air distribution tube that is connected to the air source, and a porous center tube having a plurality of micron-sized pores connected between the sampling probe and the filter assembly. A second annular chamber is defined between both tubes, and the diluent air supplied thereto is uniformly passed through the porous center tube to effect good mixing of the exhaust gas and diluent air while providing a boundary layer of diluent air that keeps the center tube clean. An alternate embodiment gas sampling device employing master and slave mass flow controllers is also disclosed.
REFERENCES:
patent: 3699814 (1972-10-01), Kaufman
patent: 4228676 (1980-10-01), Myers
patent: 4361028 (1982-11-01), Kamiya et al.
patent: 4586367 (1986-05-01), Lewis
patent: 4660408 (1987-04-01), Lewis
Mott Metallurgical Corporation Brochure entitled, "Precision Porous Metal Filter Elements", publlished cira: 1989.
Sierra Instruments Brochure entitled, "Process Gas Mass Flow Controllers and Meters", published circa: 1988.
Article in Advances in Instrumentation, vol. 29, Part 3, Paper No. 708, by: Paul M. Giever, published: 1974.
Blumenshine J. Wesley
Caterpillar Inc.
Lanchantin, Jr. Charles E.
Raevis Robert
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