A Gas Chromatography Dilution Intake Device

Abstract

The invention discloses a gas chromatography based inlet gas diluting device. The device is characterized in that an eight-way valve (16) is connected with a carrier gas connector (1), a diluted gas connector (2), a sample needle (8) and a gas needle (7) in sequence; the sample needle (8) and the gas needle (7) are connected to opposite connectors; the gas needle (7) is connected with a six-way valve (12); besides, the six-way valve (12) is communicated with a cup (15), a six-way valve carrier gas inlet (10) and a six-way valve carrier gas outlet (11) respectively by pipelines; the six-way valve carrier gas inlet (10) and the six-way valve carrier gas outlet (11) are connected with two adjacent connectors of the six-way valve (12); the cup (15) and the gas needle (7) are connected with another two adjacent opposite connectors of the six-way valve (12); and the two remaining connectors are communicated by a quantitative loop (13).

Description

technical field [0001] The invention relates to a gas chromatography dilution air intake device, which belongs to the field of laboratory appliances. Background technique [0002] When using a gas chromatograph to analyze gas samples, it usually involves diluting a certain concentration of standard gas to prepare different concentrations of standard gas for calibration curve analysis. Occasionally, gas samples that exceed the upper limit of quantification are diluted before analysis. The accuracy of gas dilution directly affects the accuracy of the final analysis results. At present, there is no mature gas dilution sampling device for gas chromatography sampling in the market. Most laboratories mainly use two glass syringes to measure a certain amount of carrier gas, standard gas or sample gas when diluting gas, and then Use a rubber tube to connect the two syringes, push and pull back and forth to mix the gas, and finally inject the mixed gas into the six-way valve or the ...

AI Technical Summary

Problems solved by technology

At present, there is no mature gas dilution sampling device for gas chromatography sampling in the market. Most laboratories mainly use two glass syringes to measure a certain amount of carrier gas, standard gas or sample gas when diluting gas, and then Use a rubber tube to connect the two syringes, push and pull back and forth to mix the gas, and finally inject the mixed gas into the six-way valve or the injection port for analysis. During the above dilution process, it is necessary to frequently open the front sealing cap of the syringe , so a small amount of air will enter the syringe during preparation, and a small amount of gas will flow out of the syringe, and the amount of gas entering and leaving cannot be estimated and reproduced. Therefore, it is often difficult to obtain accurate analysis results under this condition result

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