Long-life leak standard assembly

Details Long-life leak standard assembly Long-life leak standard assembly

1980-11-12

1982-08-10

Levy, Stuart S.

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

G01N 100, G12B 1300

Patent

active

043431763

ABSTRACT:
The present invention is directed to a portable leak standard assembly which is capable of providing a stream of high-purity reference gas at a virtually constant flow rate over an extensive period of time. The leak assembly comprises a high pressure reservoir coupled to a metal leak valve through a valve-controlled conduit. A reproducible leak valve useful in this assembly is provided by a metal tube crimped with a selected pressure loading for forming an orifice in the tube with this orifice being of a sufficient size to provide the selected flow rate. The leak valve assembly is formed of metal so that it can be "baked-out" in a vacuum furnace to rid the reservoir and attendent components of volatile impurities which reduce the efficiency of the leak standard.

REFERENCES:
patent: 2981091 (1961-04-01), Roberts
patent: 3209579 (1965-10-01), Roberts
patent: 3290920 (1966-12-01), Novak
patent: 3516278 (1970-06-01), Klein et al.
patent: 3614855 (1971-10-01), Van Luik, Jr.
patent: 3760773 (1973-09-01), Christensen
patent: 3776023 (1973-12-01), Budd et al.
patent: 4142860 (1979-03-01), Mayeaux
patent: 4164861 (1979-08-01), Schlereth et al.
patent: 4172378 (1979-10-01), Limp

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