| 摘要 |
For the taking of liquid from large-volume, deep vessels by means of sucking vessels having short suction elements, a metered stand-by volume of liquid, which is accessible from above, is sucked from a volume of liquid of changing depth in the deep vessel and a defined sample of liquid is sucked from said stand-by volume at the same time. The auxiliary sucking device comprises a tube, which is adapted to be introduced into the deep vessel, and a check valve, which prevents a flow to the open bottom end of the tube. The tube is mounted on a bowl, which is adapted to be placed on the mouth of the deep vessel. The bowl preferably constitutes a portion of a housing in which the open top end of the tube is disposed close to the top wall of the housing. The top portion of the bowl contains an entrance opening, which is disposed above the stand-by volume of liquid, at least part of which is contained in the bowl. The entrance opening is adapted to receive the tip of a sample-taking vessel, which is provided with a piston. During the taking of each sample, a stand-by volume of liquid having a defined depth is provided in the housing.
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