REAGENT SUPPLYING DEVICE

PURPOSE:To select reagents without damaging the reagents so that the reagents can be supplied only to the necessary liquid by adopting means operating on fluid pressure, etc., for means for feeding the reagent liquids and forming a sampling vessel of plural vessels consisting of two vessels which are different in volume. CONSTITUTION:The liquid in a storage tank 1 is discharged to a supply path 4 when a force-feed pump 3 starts force-feeding. A selection valve 7 is held closed with the sampling vessel 5 which is selected as the sampling of the reagent by multipipettes 8 is necessary. The liquid, therefore, flows from a branch path 6 to pickup rooms 51 and flows from an overflow wall 53 to escapement rooms 52. All the liquid levels of the rooms 51 selected in such a manner are maintained constant and the liquid is drawn from a sampling device 9 into the pipettes 8. On the other hand, the liquid passes the branch path 6 and flows into both the rooms 51, 52 with the sampling vessel 5 which is not-selected, i.e., the valve 7 of which is held open. However, the rooms 52 have the large volume and, therefore, the greater part of the liquid flows into the rooms 52. The liquid in the rooms 51 does not, therefore, overflow, and is eventually not sampled by the pipettes 8.