Patent ID: 6035697
Filing Date: 2000-03-14
Classification: G01N

Abstract:
An interface coupling for gas supplied to a mass spectrometer comprising:a coupling body having an internal passage accommodating a flow of a gas between first and second ends thereof and having a constriction of substantially narrowed diameter within said passage at a central location;the first end of said body adapted for connection of said body, via a capillary duct insertable within said passage into said constriction, in a press-fit to form a gas-tight seal along an elliptical juncture of said capillary duct and said passage into said constriction, to a low pressure environment of a mass spectrometer to provide gas flow between said passage and said spectrometer;the second end of said body adapted to provide coupling and decoupling of said body to a supply of gas to be analyzed by said mass spectrometer and to provide gas flow between said supply and said mass spectrometer; andsaid passage, with said capillary duct, and said constriction providing an impedance to the loss of said low pressure environment during coupling and decoupling.