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|1. (WO2017033910) AUTOMATIC ANALYSIS DEVICE, DISPENSING METHOD, AND LIQUID SURFACE DETECTION METHOD|
|Applicants:||HITACHI HIGH-TECHNOLOGIES CORPORATION
|Title:||AUTOMATIC ANALYSIS DEVICE, DISPENSING METHOD, AND LIQUID SURFACE DETECTION METHOD|
The present invention realizes an automatic analysis device which can improve accuracy of dispensing a specimen and a reagent by detecting a liquid surface position with high accuracy irrespective of presence/absence of a specimen or of a reagent container lid. A nozzle is lowered toward the liquid surface, a capacitance value detected during the lowering operation is stored in a memory, and when the nozzle is determined to have been lowered by a set lowering amount, the lowering operation is stopped (steps S10-S20). Whether a liquid exists or not is determined on the basis of the capacitance value, which is stored in the memory, at the height of the reagent container lid, and when a liquid exists, an abnormality process is performed (steps S20b, S80a). When it is determined at step S20b that a liquid does not exist, an operation of sucking a reagent is performed, a determination process of a pressure value by a pressure sensor and a determination process of the capacitance value are performed, and only when an abnormality such as air suction is determined, on the basis of a pressure waveform, to have not occurred and a liquid surface is determined to exist, normality is determined (step S50a). If an abnormality is determined at step S50a, an abnormality process such as generation of an alarm is performed (step S80).