Measuring and testing – With fluid pressure – Leakage
Patent
1991-02-08
1992-08-04
Williams, Hezron E.
Measuring and testing
With fluid pressure
Leakage
G01M 320
Patent
active
051348772
ABSTRACT:
A portable counterflow helium leak detector has only one pump. The pump is a secondary vacuum pump including an inlet and an outlet. A gas analyzer is connected to the inlet of the pump. The outlet is connected via an inlet valve to a correction orifice for connection to an installation to be tested, the installation being evacuated or being capable of being connected to a primary pump. The detector further includes electronic power supply and control circuit, a power supply, and a display. The detector further includes a first pressure gauge situated between the inlet valve and the connection orifice and an ON/OFF control switch for controlling detector operation. The electronic control circuits cause the inlet valve to open and the secondary vacuum pump to start whenever the detector is powered. The control switch is in the ON position and the pressure measured by the first gauge is below a determined value. The gas analyzer is automatically switched on when the secondary vacuum pump reaches its nominal speed. A second pressure gauge is situated at the vacuum pump. The detector is powered, putting the control switch into the OFF position to cause the inlet valve to be closed if it was open, while continuing to run the pump providing the pressure measured by the second pressure gauge is below a reference value. The gas analyzer is likewise maintained in operating condition providing the pump is at its nominal speed. The pump is a mechanical rotary pump.
REFERENCES:
patent: 3327521 (1967-06-01), Briggs
patent: 4399690 (1983-08-01), Fruzzetti
patent: 4459844 (1984-07-01), Burkhart
patent: 4583394 (1986-04-01), Murakami et al.
Type 24-120B Leak Detector, in Consolidated Electrodynamics Brochure, pp. 1-16, Mar. 1966.
Technisches Messen, vol. 54, No. 3, 1987, pp. 89-94, Munich, Germany; C. J. Kundig: "Neue Wege beim Bau und der Anwendung von Helium-Lecksuchern".
Technica, Sep. 1982, p. 867, Zurich, Switzerland: "Tragbarer Massenspektrometer-Lecksucher".
Gilles Baret
Roland Gevaud
Alcatel Cit
Roskos Joseph W.
Williams Hezron E.
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