| 摘要 |
An arrangement for supplying metered quantities of reagent liquid to a test-tube in a clinical analyzing apparatus, includes a cup for reagent liquid and a pipetting pump which is movable between the reagent cup and the test-tube and which is able to withdraw by suction a given volume of reagent liquid from the reagent cup and dispense said volume of liquid into the test tube. The reagent liquid can be supplied to the cup from a storage vessel, by connecting a source of sub-pressure to the reagent cup and by withdrawing reagent liquid from the storage vessel by suction up into said cup through a line connecting the storage vessel with the cup. The sub-pressure is applied to the reagent cup by means of a bellow structure mounted on the pump so as to be moved into sealing abutment with the rim of the reagent cup when the pump is lowered thereinto. The bellow structure is connected to a source of sub-pressure. For the purpose of emptying and cleaning the reagent cup and the line passing thereto, the pump may be arranged to dispense water into said cup, the means arranged for connecting the reagent cup to a sub-pressure source being also arranged to alternatively connect a source of over-pressure to the reagent cup, so that reagent liquid and water can be forced out from the cup and the line connected thereto, to drain. (FIG. 1).
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