Automatic sample injector and method of operating same

Details Automatic sample injector and method of operating same Automatic sample injector and method of operating same

1997-03-12

1999-01-19

Ludlow, Jan

Chemistry: analytical and immunological testing

Including sample preparation

Volumetric liquid transfer

73 2341, 73 2342, 7386301, 7386487, 95 89, 96105, 422 89, 422100, 436161, G01N 124, G01N 3018, G01N 3024

Patent

active

058613170

ABSTRACT:
An automatic sample injector for injecting a liquid sample into a vaporization chamber of a gas chromatograph includes a syringe, a plunger adapted to move inside the barrel of this syringe, a stepping motor having a plurality of magnetic poles for moving the plunger up and down inside the barrel, a power source for supplying excitation currents to these magnetic poles, switches for these magnetic poles, and a control unit for controlling the switches or the power source such that the excitation current to one of a pair of the magnetic poles corresponding to a rotary angular position is increased and the excitation current to the other of the pair is simultaneously decreased.

REFERENCES:
patent: 3855129 (1974-12-01), Abrahams et al.
patent: 4336484 (1982-06-01), Marinko
patent: 4658194 (1987-04-01), Richter et al.
patent: 4671123 (1987-06-01), Magnussen, Jr. et al.
patent: 4905526 (1990-03-01), Magnussen, Jr. et al.
patent: 5352963 (1994-10-01), Garand et al.
patent: 5359271 (1994-10-01), Husher

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