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US 4,985,625 AGranted
Transfer line for mass spectrometer apparatus
AssigneeFinnigan Corporation
InventorJames Hurst
Life of this patent
Estimating the term…
Abstract
A transfer line used between a gas chromatograph and an ion source of a mass spectrometer is constructed with an inner tube, a middle tube and an outer tube. Disposed within the middle tube are a heater unit which extends along the middle tube and a sensor well. The remaining air space in the middle tube is filled with compacted fine thermally conductive powder. Thermal insulation is provided between the middle and outer tubes. End seals are provided to maintain the integrity of the vacuum system of the mass spectrometer.
Claims11
A mass spectrometer apparatus having a gas chromatograph including a gas column and an ion source comprising:
- a transfer line coupled between said gas column and said ion source comprising an assembly of coaxial spaced tubes including an inner tube through which the effluent or eluant from the gas column is directly passed to the ion source, a middle tube and an outer tube;
- a heater unit housed within the and extending along the entire length of said middle tube;
- and thermally conductive material contained between the entire length of said middle tube and the inner tube to fill all of the unoccupied space between the middle tube and inner tube whereby the inner tube is uniformly heated to pass the effluent or eluant from the gas column to the ion source without changing the chemical structure.
Dependencies are inferred from the claim text.