Patent ID: 6718817
Filing Date: 2004-04-13
Classification: G01N

Abstract:
A sample injection device for gas chromatography, comprising:a gas sample channel on a side of second layer to connect to inlet valve, outlet valve and injection valve to inject a fixed portion of sample to an analytical column; an inlet valve connecting to inlet at a end of said gas sample channel to introduce sample at normally open condition and closed upon pressurization during sample injection; an outlet valve connecting to outlet at a end of said gas sample channel to release excess sample at normally open condition and closed upon pressurization during sample injection; an injection valve having its seat on one side of a fourth layer to connect near outlet end of said gas sample channel to be closed at normal condition and opened upon pressurization to inject a fixed portion of sample to an analytical column; a carrier gas port on a second layer for same side of said gas sample channel to split into an analytical gas channel and a reference gas channel, wherein said analytical gas channel connected to reference capillary column and said reference gas channel connected to analytical capillary column, said analytical gas channel and said reference gas channel leading to a gaseous detector and being much narrower than said gas sample channel; a solenoid valve connecting a carrier gas tank and said gas sample channel being activated open to pressurize the said gas sample channel and close the said inlet valve and outlet valve and open the said injection valve.