A semiconductor memory device of this invention enables high rate readout of stored data without read failure. In an application of such an electrode, an organic electroluminescent device comprises a first and second conductor layers. A control unit is provided with a processor which controls the pump at a preset first flow rate value, and receives from a pressure sensor a first pressure value, compares the first pressure value with a reference pressure value and, on the basis of this comparison, determines whether or not the extracorporeal circuit is of a pediatric type or of an adult type. In a second embodiment, the rotatable cap may remain closed and the adapter can still dispense liquids through the tap using a pump.