Helium leak detector

Details Helium leak detector Helium leak detector

1992-09-23

1994-08-30

Williams, Hezron E.

Measuring and testing

With fluid pressure

Leakage

G01M 320

Patent

active

053416716

ABSTRACT:
A helium leak detector includes a gas analyzer and a secondary pump having at least on its discharge side a Holweck type stage. The pump is of a type enabling the suction pressure to be reduced to a value at least equal to 10.sup.-4 mbar and a discharge pressure which is sufficiently high to be compatible with the suction pressure of a dry primary pump having at least two stages. The secondary pump is connected to the low-pressure output of a sampling unit on an intermediate point of the secondary pump where the flow conditions are molecular. A sniffer probe is connected to the high-pressure side of the sampling unit. This high-pressure side is further connected to the dry primary pump between its at least two stages.

REFERENCES:
patent: 4294106 (1981-10-01), Gevalid et al.
patent: 4779449 (1988-10-01), Bley et al.
patent: 4893497 (1990-01-01), Danielson
patent: 4919599 (1990-04-01), Reich et al.
patent: 5107697 (1992-04-01), Tallon et al.
patent: 5116196 (1992-05-01), Baret et al.
patent: 5193380 (1993-03-01), Tallon

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