Patent
Fluid-lock fixed-volume injector
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TLDR
In this paper, an automated micro-valve assembly injects fluid into a destination stream, and a fixed volume of the injected fluid is injected into destination stream (26) by pressurizing injected fluid and opening valve.Abstract:
An automated micro-valve assembly injects fluid into a destination stream. The injected fluid is admitted into chamber (11) via valve (18). The injected fluid is retained in the chamber (11) by valves (13, 14, 17, 18). A fixed volume of the injected fluid is injected into destination stream (26) by pressurizing the injected fluid and opening valve (17). The fluid is pressurized by opening T-valve (14), which admits purge gas at a higher pressure than the injected fluid. The purge fluid flows toward the injection valve (17), forming a fluid-lock which establishes the fixed volume of fluid to be injected. The injected fluid between points (22) and (23) is thereby injected into destination stream (26).read more
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References
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Journal ArticleDOI
A gas chromatographic air analyzer fabricated on a silicon wafer
TL;DR: In this article, a miniature gas analysis system based on the principles of gas chromatography (GC) has been built in silicon using photolithography and chemical etching techniques, which allows size reductions of nearly three orders of magnitude compared to conventional laboratory instruments.
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Miniature gas chromatograph apparatus
TL;DR: In this article, a gas chromatography assembly has a substrate wafer with grooves and a valve seat etched therein, each passing through the valve seat for controlling the flow of sample gas from the sample gas channel into the carrier gas channel.
PatentDOI
Flow injection analysis
TL;DR: FI is an unsegmented continuous flow technique and by manipulating basic operational parameters, a wide variety of analytical conditions can be established in a highly reproducible manner, allowing the routine determination of a diverse range of analytes, sample matrices and concentration ranges.
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Mechanical Gas Chromatography Injection Valves and Column Multiplexing Techniques
Richard Sacks,Anita Jo Peters +1 more
TL;DR: In this paper, a gas chromatography system is described in which multiple columns are used which are time multiplexed with a single detector to produce a complex combined chromatogram from the plural columns.
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System for preparation of samples for analysis
TL;DR: In this article, the authors present an automated sample preparation system for chemical assay of samples of materials, which includes a sample preparation chamber with a removable cup for taking to the location of solid or very viscous samples.