Patent ID: 6518581
Filing Date: 2003-02-11
Classification: H01J

Abstract:
A gas sampling and inlet device for a mass spectrometer comprising a substantially hollow housing sleeve having a first open inside region and a substantially hollow inner sleeve having a second open inside region having a cross-sectional area, said inner sleeve coaxial to said housing sleeve, said housing sleeve having a first end, a hollow body, and a second end, said inner sleeve having a inlet end, a hollow body, and an outlet end, said first end and said inlet end having a first end cap sealingly connected thereto, said, second end having a second end cap sealingly connected thereto, said outlet end being open such that said second open inside region is in fluid communication with said first open inside region, said first end cap having a small diameter first orifice adapted to receive a gaseous fluid, said small diameter first orifice having a substantially smaller area than the cross-sectional area of the second open inside region to avoid capillary action in said second open inside region, and said second end cap sealingly connected to the mass spectrometer, said second end cap having a second orifice adapted to receive a gaseous fluid into the mass spectrometer, said housing sleeve having a vacuum means in fluid communication with said hollow body of said housing sleeve.