| 摘要 |
PURPOSE: To allow no bubble in a liquid extracted from a dialytic circuit by providing at least one buffer vessel 1 connected with a dialytic fluid circuit on one end and width a measuring VESSEL on the other end so that the buffer vessel fills the measuring vessel with the fluid therefrom by means of gravity. CONSTITUTION: When sections of a buffer vessel 12 are enlarged at least on a level of detectors 3, 4, a filling speed at the final stage can be slowed down even if the channel to pass the fluid is narrowed at the place where the level detector 4 is placed. By narrowing the channel at the place where the fluid passes during detection, accuracy in measuring a liquid level is improved, and a slowed flow velocity makes detection of liquid levels carried out satisfactorily. When the fluid reaches the level of the detector 4, the detector sends an electric signal to a controlling element 5 and opening and closing of valves 7, 8 are reversed so as to keep a vessel 2 in a liquid discharging state and a vessel 1 in a liquid filling state. The controlling element 5, which stores the capacity of the measuring vessel 2, computes a value of ultrafiltration to be measured with the capacity of the vessel 2.
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