Flow-limited direct GC/MS interface

Details Flow-limited direct GC/MS interface Flow-limited direct GC/MS interface

1985-03-18

1987-05-05

Spitzer, Robert

Gas separation

With remote fan or pump and unconfined flow to separator

55197, 422 70, B01D 1508

Patent

active

046629149

ABSTRACT:
A capillary-direct interface, suitable for connecting a gas chromatograph to a mass spectrometer, having a flow restrictor that is to be mounted at the entrance to the ionization chamber of the mass spectrometer to prevent damage to the mass spectrometer if the column of the gas chromatograph is removed from the mass spectrometer or breaks inside the interface. A preferred flow restrictor includes a hollow tube, the middle of which is connected to an exhaust port to enable a vacuum pump to remove gas from the middle of the tube. The hollow tube is enclosed by a high thermal conductivity tube that is thermally connected to a heat source to control the temperature of the hollow tube. A capillary GC column can be inserted entirely through the hollow tube into the ionization chamber to produce a capillary direct mode of coupling. Also, an additional capillary tube, inside the hollow tube and extending from the ionization and detection chamber to the end of the GC column, can be used to implement the open-split and jet separator modes of coupling.

REFERENCES:
patent: 3936374 (1976-02-01), Bradley et al.
patent: 4391778 (1983-07-01), Andresen et al.
patent: 4394263 (1983-07-01), Dosch et al.
patent: 4453954 (1984-06-01), Kolb et al.

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