Gas chromatograph
In a sample vaporization chamber, a liquid sample is vaporized therein to produce a sample gas. A split flow path is configured to discharge the sample gas in the sample vaporization chamber. A valve is provided in the split flow path and opens/closes to adjust a flow rate of the sample gas flowing through the split flow path. A filler material is provided at a filling position in the sample vaporization chamber or in the split flow path. The controller is configured to control a degree of opening of the valve so that when the sample gas in the sample vaporization chamber is discharged from the split flow path, a pressure in the sample vaporization chamber decreases at a pressure gradient smaller than a pressure gradient at which the filler material is displaced from the filling position.
1 . A gas chromatograph comprising:
a sample vaporization chamber configured to vaporize a liquid sample to produce a sample gas;
a split flow path configured to discharge the sample gas in the sample vaporization chamber;
a valve provided in the split flow path, the valve being configured to open and close to adjust a flow rate of the sample gas flowing in the split flow path;
a filler material provided at a filling position in at least one of the sample vaporization chamber and the split flow path; and
a controller configured to control a degree of opening of the valve so that when the sample gas in the sample vaporization chamber is discharged from the split flow path, a pressure in the sample vaporization chamber decreases at a pressure gradient smaller than a pressure gradient at which the filler material is displaced from the filling position.
2 . The gas chromatograph as recited in claim 1 , further comprising:
a pressure sensor configured to detect the pressure in the sample vaporization chamber,
wherein the controller is configured to control the degree of opening of the valve so that the pressure in the sample vaporization chamber decreases at a first pressure gradient that is smaller than the pressure gradient at which the filler material is displaced from the filling position until the pressure in the sample vaporization chamber detected by the pressure sensor becomes less than or equal to a threshold, and then control the degree of opening of the valve so that the pressure in the sample vaporization chamber decreases at a second pressure gradient that is larger than the first pressure gradient.
3 . The gas chromatograph as recited in claim 2 ,
wherein the second pressure gradient is a pressure gradient that occurs when the degree of opening of the valve is controlled so that a flow resistance of the valve is minimized.
4 . The gas chromatograph as recited in claim 1 ,
wherein the filler material is filled at a filling position in an insert provided in the sample vaporization chamber.
5 . The gas chromatograph as recited in claim 1 , further comprising:
a filter provided at the filling position in the split flow path,
wherein the filler material is filled into the filter.