Alcatel

Alain Devance

Gilles Baret

Roland Gevaud

A gas analyzer comprising a pump unit and autocalibration means, characterized in that the gas analyzer is connected to a storage tank having a calibrated leak and filled with a mixture of n gases having different masses, and wherein the partial leakage flow of each of said n gases which through said calibrated leak is known.

Gas analyzing apparatus

A tracer gas leak detector that analyzes a test gas for presence of a tracer gas therein, including at least one gas analyzer, a secondary pump whose suction inlet is connected to the gas analyzer, a primary pump connected to the secondary pump outlet via a first pipe fitted with a first valve, and a second pipe connecting the first pipe from a point situated between the first valve and the primary pump to an inlet of the detector for connection to an enclosure via a pre-evacuated flow and said gas analyzer receiving said test gas from a part of said pre-evacuated flow, the second pipe being fitted with a second valve, the primary pump serving to pre-evacuate the enclosure, wherein a sampling member for sampling the flow travelling along the second pipe is situated directly on the wall of the second pipe in direct contact with the flow and is connected via a duct directly to the analyzer, the sampling member having flow conductance enabling the pressure in the duct to be compatible with operation of the gas analyzer while the second pipe is at a pressure greater than 10 mbar.

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Ugine, France

Alain Devance