| 摘要 |
When dispensing from one specimen is repeated, the cleaning liquid adhering to an outer wall of a cleaned dispensing nozzle is likely to be moved into a sample vessel during aspiration of the sample and result in reduced sample concentration or deteriorated analytical accuracy. Thus, the cleaning mechanism has a cleaning range of the dispensing nozzle outer wall which is changed according to a range in which dirt adheres to the nozzle. Additionally, an ejector effect acting between the dispensing nozzle and a cleaning liquid flow prevents a decrease in the concentration of the sample by reducing the amount of cleaning liquid which adheres to the dispensing nozzle outer wall. The cleaning mechanism also uses a liquid level detection function of the dispensing nozzle and a nozzle pipe internal-pressure change detection function to determine a discharge state of the cleaning liquid flow and obtain an appropriate cleaning range.
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