| 摘要 |
PURPOSE:To dispense liquid equally regardless of reduction in number of test tubes to be dispensed, by providing each dispensing nozzle with a by-pass, and allowing the pressurized liquid in a dispensing nozzle on the side where dispensation has been recognized to be unnecessary, to by-pass by the same amount as the amount due to be ejected. CONSTITUTION:In case that three test tubes 8 are set against three dispensing nozzles 7, respectively, the three-way valves 6 generally connect an outlet manifold 5 with three dispensing nozzles 7, respectively. When a valve 4 for washing liquid control is opened in a duration specified by a liquid amount-setting timer T, a prescribed amount of washing liquid is dispensed, respectively. In case that only one or two test tubes 8 are set, the three-way valve 6 which corresponds to the dispensing nozzle 7 on the side where dispensation has been recognized to be unnecessary, turns to a manifold 10 on the side of by-passes simultaneously with turning-on of the timer T. Then a by-pass is formed, and washing liquid is poured into a tank 11 for by-passing liquid, not through the dispensing nozzle 7 as a washing nozzle, but through the by-pass. |
