| 摘要 |
An automatic sampling device is formed of a syringe with a hollow needle, a plug formed of a soft elastic member and slidably engaging the needle to cover at least an opening of the needle, and a guide mechanism situated between the plug and the syringe. The guide mechanism holds the plug to allow the plug to hold the tip of the needle along a center axis of the syringe and to allow the needle to move through the plug from the tip to a root of the needle. When the tip of the needle is located in the plug, the opening of the needle is closed to prevent passage of a fluid therethrough. Thus, a sample gas does not leak through the opening of the needle due to diffusion. Also, since the mechanism for holding the rubber plug provided at the needle tip also acts as the guide for holding the needle tip on the center axis of the syringe, the needle does not generally bend even if a force in an oblique direction is applied to the needle tip.
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