Patent ID: 8721966

Claim:
A chemical analyser, comprising: a container where a sample solution and a reagent are mixed; a sample solution dispensing unit configured to execute a dispensing operation, which includes an aspiration of a sample and a discharge of the aspirated sample into the container by a sample dispensing probe; a detecting unit configured to detect a surface of the reagent; a reagent dispensing unit configured to execute a dispensing operation, which includes an aspiration of the reagent and a discharge of the aspirated reagent into the container by a reagent dispensing probe; and a controller configured to control the reagent dispensing unit to dispense the reagent by the reagent dispensing probe in a first step, and to control the sample dispensing unit to descend and stop in the position where the end of the dispensing probe is at a predetermined depth under the surface of the reagent in the container and to dispense the sample solution in a second step after the first step, and to control the reagent dispensing unit to dispense the reagent by the reagent dispensing probe in a third step after the second step; wherein the controller controls the reagent dispensing unit such that amount of the reagent dispensed in the first step is smaller than amount of the reagent dispensed in the third step and the concentration of the reagent dispensed in the third step is the same as the concentration of reagent in the first step.