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US 10,371,674 B2Granted
Chromatograph sampler and method for operating chromatograph sampler
AssigneeHORIBA STEC, Co., Ltd.
InventorsTomohiro Sasaki, Tomotaka Yoshimura, Shoji Narukami, Tsuneaki Maeda
Life of this patent
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Abstract
In order to, in a chromatograph sampler, regulate the pressure of a sample fluid filled in a constant volume tube to be as constant as possible and ensure the reproducibility of measurement, the chromatograph sampler is configured to provide a bypass line between a sample introduction line and a sample discharge line in parallel with the constant volume tube, and when filling the sample fluid in the constant volume tube, flow the sample fluid also through the bypass line in parallel.
Claims8
A chromatograph sampler configured to supply a sample fluid as a measurement target to a column of a chromatograph, the chromatograph sampler comprising:
- a constant volume tube having a pair of fluid inlet/outlet ports;
- a sample introduction line into which the sample fluid is introduced from a supply source of the sample fluid;
- a sample discharge line from which the sample fluid is discharged to a discharge space for the sample fluid;
- a multiport valve configured to switch between a first mode in which any one of the fluid inlet/outlet ports of the constant volume tube is connected to the sample introduction line, the other is connected to the sample discharge line, and the sample fluid is filled in the constant volume tube while circulating, and a second mode in which both of the fluid inlet/outlet ports are respectively disconnected from the sample introduction line and the sample discharge line and any one of the fluid inlet/outlet ports is connected to the column;
- a controller configured to keep the multiport valve in the first mode to fill the sample fluid in the constant volume tube, and then switch the multiport valve to the second mode to introduce the sample fluid in the constant volume tube into the column;
- and
- a bypass line of which one end is connected to the sample introduction line and the other end is connected to the sample discharge line;
- and
- the chromatograph sampler is configured to switch between a state where the sample fluid flows only through the constant volume tube, and a state where the sample fluid flows through both the constant volume tube and the bypass line in parallel.
6 more elements
A method for operating a chromatograph sampler comprising:
- a constant volume tube having a pair of fluid inlet/outlet ports;
- a sample introduction line into which a sample fluid as a measurement target is introduced from a supply source of the sample fluid;
- a sample discharge line from which the sample fluid is discharged to a discharge space for the sample fluid;
- and
- a bypass line of which one end is connected to the sample introduction line and the other end is connected to the sample discharge line, the method:
- connecting any one of the fluid inlet/outlet ports of the constant volume tube to the sample introduction line and connecting the other to the sample discharge line to thereby flow the sample fluid through the constant volume tube and through the bypass line in parallel;
- then
- disconnecting both of the fluid inlet/outlet ports of the constant volume tube respectively from the sample introduction line and the sample discharge line;
- and
- connecting any one of the fluid inlet/outlet ports to a column of a chromatograph to introduce the sample fluid in the constant volume tube into the column.
7 more elements
A chromatograph sampler configured to supply a sample fluid as a measurement target to a column of a chromatograph, the chromatograph sampler comprising:
- a constant volume tube having a pair of fluid inlet/outlet ports;
- a sample introduction line into which the sample fluid is introduced from a supply source of the sample fluid;
- a sample discharge line from which the sample fluid is discharged to a discharge space for the sample fluid;
- a multiport valve configured to switch between a first mode in which any one of the fluid inlet/outlet ports of the constant volume tube is connected to the sample introduction line, the other is connected to the sample discharge line, and the sample fluid is filled in the constant volume tube while circulating, and a second mode in which both of the fluid inlet/outlet ports of the constant volume tube are respectively disconnected from the sample introduction line and the sample discharge line and any one of the fluid inlet/outlet ports is connected to the column;
- a controller configured to keep the multiport valve in the first mode to fill the sample fluid in the constant volume tube, and then switch the multiport valve to the second mode to introduce the sample fluid in the constant volume tube into the column;
- and
- a bypass line configured to at least immediately before switching from the first mode to the second mode, keep pressure of the constant volume tube at a predetermined value;
- and
- the chromatograph sampler is configured to switch between a state where the sample fluid flows only through the constant volume tube, and a state where the sample fluid flows through both the constant volume tube and the bypass line in parallel.
6 more elements
Dependencies are inferred from the claim text.