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US 7,195,229 B2Granted
Automatic sampler
AssigneeShimadzu Corporation
InventorYoshiaki Maeda
Life of this patent
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Abstract
In a direct injection type automatic sampler, a sampling needle having a liquid sample collected from a sample vessel by using suction force of a pump is inserted into an injection port. Then, a flow path-switching valve is rotated to switch a flow path to make a flow of mobile phase liquid pass through a loop to thereby introduce the collected sample into a column. The injection port is directly incorporated in the flow path-switching valve.
Claims8
An automatic sampler comprising:
- a sampling needle for drawing in and collecting a liquid sample;
- an injection port having a needle seal with a through-hole in its center and into which said liquid sample is injected by said sampling needle;
- a flow path-switching valve for performing switching of a flow path;
- a first pump for communicating a suction force to said sampling needle when said flow path-switching valve is in a first position so as to draw in and collect the liquid sample with the sampling needle;
- a second pump for pressurizing the collected liquid sample so as to inject the liquid sample from said needle into said sample port when said flow path-switching valve is in a second position, wherein, when said flow path-switching valve is in said second position said second pump is connected to both said sampling needle and said injection port by a flow path through said flow path-switching valve,
- wherein said injection port is incorporated in said flow path-switching valve, and a front end of the sampling needle and the needle seal are fitted to one another.
3 more elements
Dependencies are inferred from the claim text.