| 摘要 |
PROBLEM TO BE SOLVED: To provide a dispensing device capable of discriminating the suction state of a liquid sample regardless of a dispensation amount, when dispensing the liquid sample. SOLUTION: This dispensing device equipped with a dispensing means for sucking/discharging the liquid sample by a sample probe by connecting a dispensing pump to the sample probe through a pipe, and by allowing the dispensing pump to perform suction/discharge operation, and a pressure detection means for detecting the pressure of the pipe including the sample probe, is provided with a temporary discharge section for discharging quantitatively the liquid sample after suction and before discharge of the liquid sample by the dispensing means, and is equipped with a suction state discrimination means for discriminating the suction state of the liquid sample based on output from the pressure detection means in the temporary discharge section. In the case of empty suction, a negative pressure is generated by suction of air just after discharge resulting from discharge of the air not receiving viscosity of the liquid sample, and a pressure change in the temporary discharge section becomes large compared with normal suction. Namely, empty suction can be discriminated stably and accurately by observing the large pressure change. In addition, since the discharge amount is always constant in the temporary discharge section, the change of the interval or the number of integration sections or the change of a threshold range is not required. COPYRIGHT: (C)2007,JPO&INPIT |
