Patent ID: 6864487
Filing Date: 2005-03-08
Classification: H01J

Abstract:
1. A device for introducing liquids or gas into a mass spectrometers vacuum comprising: a) a housing encompassing an internal standard reservoir; b) a stepper motor mounted on an outside wall of said housing; c) a guide rod extending through said wall into said housing under control of said stepper motor; d) a sampler rod having engineered leaks for introducing environmental matter into said reservoir, said sampler rod being within said reservoir and slidable out through an opposite wall of said housing engaged to and driven by said guide rod, the sampler rod under the guidance of the stepper motor moving from an engaging position with a predetermined known sample material inside of the internal standard reservoir to an engaging external position with an environmental material to be sampled so as to permit alternate sampling of said known sample material and said environmental material; and e) a pressure compensating bladder mounted in said opposite wall of said housing; and f) means for mounting said device on a mass spectrometer for providing sealed communication between said reservoir and said spectrometer.