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US5297422A Expired / Lapsed US ⏱️ 0.0 years remaining

Tracer-gas leak detector

Assignee: Alcatel CIT SA
•
Filing: 1992-09-24
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Granted: 1994-03-29
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Expires: 2012-09-24
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Abstract

Abstract A tracer-gas leak detector includes an analysis unit and a primary pump whose inlet is connected to an inlet orifice of the detector via a first pipe equipped with a first valve. A secondary pumping set has an inlet connected to the analysis unit and an outlet connected to the inlet of the primary pump. The primary pump is a dry pump. The secondary pumping set includes two secondary pumps of the mechanical type separated from each other by a second valve. The secondary pump that is proximate to the dry primary pump is the second secondary pump and includes a dynamic seal stage at its outlet. A second pipe connects the inlet of the second secondary pump to the first pipe downstream from the second valve. A third valve is disposed on the first pipe between the outlet of the second secondary pump and the junction where the second pipe meets the first pipe. The third valve is controlled by a pressure sensor placed at the inlet of the second secondary pump.

Inventors

  • 👤 Gilles Baret

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-04 17:07
CPC Classifications
G; G01; G01M; G01M3/00; G01M3/02; G01M3/04; G01M3/20; G01M3/202

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 176 words
A tracer-gas leak detector including an analysis unit, a primary pump having an inlet connected to a first inlet orifice of the detector via a first pipe equipped with a first valve, and a secondary pumping set having an inlet connected to said analysis unit and an outlet connected to the inlet of the primary pump, wherein the primary pump is a dry pump, said secondary pumping set includes two secondary pumps of the mechanical type separated from each other by a second valve, the secondary pump proximate to said dry primary pump being a second secondary pump and including a dynamic seal stage at an outlet thereof, and wherein a second pipe connects the inlet of said second secondary pump downstream from said second valve, to said first pipe, a third valve is disposed on said first pipe between the outlet of said second secondary pump and a junction where the second pipe meets the first pipe, said third valve being controlled by a pressure sensor placed at the inlet of said second secondary pump.
Claim 2
Dependent Claim 176 words
A tracer-gas leak detector including an analysis unit, a primary pump having an inlet connected to a first inlet orifice of the detector via a first pipe equipped with a first valve, and a secondary pumping set having an inlet connected to said analysis unit and an outlet connected to the inlet of the primary pump, wherein the primary pump is a dry pump, said secondary pumping set includes two secondary pumps of the mechanical type separated from each other by a second valve, the secondary pump proximate to said dry primary pump being a second secondary pump and including a dynamic seal stage at an outlet thereof, and wherein a second pipe connects the inlet of said second secondary pump downstream from said second valve, to said first pipe, a third valve is disposed on said first pipe between the outlet of said second secondary pump and a junction where the second pipe meets the first pipe, said third valve being controlled by a pressure sensor placed at the inlet of said second secondary pump.
Claim 3
Dependent Claim 39 words
A leak detector according to claim 1, further including a second inlet orifice connected to said first pipe upstream from said dry primary pump, said second inlet orifice enabling a gas distinct from the tracer gas to be injected.
Claim 4
Dependent Claim 18 words
A leak detector according to claim 2, wherein said second inlet orifice is connected to a gas container.
Claim 5
Dependent Claim 26 words
A leak detector according to claim 1, wherein a third pipe, equipped with a fourth valve, connects said inlet of said detector to the gas analyzer.

References Cited (Backward Citations)

US4773256A Cited
US4919599A Cited
US4984450A Cited
US5107697A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1997-03-28 1997-09-27 1998-03-29 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2001-03-28 2001-09-27 2002-03-29 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2005-03-28 2005-09-27 2006-03-29 $7700.00 Window Closed / Lapsed

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