Patent ID: 7448256

Claim:
A system for determining the leakproofness of an object comprising a first cavity, said system comprising: a closed chamber comprising a second cavity, wherein the chamber is arranged to envelop said object within said second cavity, an evacuator arranged to lower a pressure inside one of said first cavity and second cavity with respect to an ambient pressure of the chamber, a supply of a tracer gas supplying the tracer gas into the one of said first cavity and said second cavity having a higher pressure, wherein the tracer gas comprises hydrogen, a detector being sensitive to said tracer gas, and a supply of a transport gas other than the tracer gas arranged to introduce the transport gas into the one of said first cavity and said second cavity having the lower pressure, wherein said evacuator is further arranged to compress arriving gas comprising the transport gas or the transport gas and the tracer gas to the ambient pressure of the chamber, and wherein said detector is arranged to communicate with the one of said first cavity and said second cavity having the lower pressure via the evacuator and is arranged for operation at the ambient pressure of said chamber.