| 摘要 |
PROBLEM TO BE SOLVED: To prevent splashing of a delivered residual liquid while improving a treating speed in the replacing of a nozzle chip of the analyzer for having an automatically dispensing function. SOLUTION: A pressure sensor 70 is provided to measure a pressure in a nozzle base part 52 into which is press-fitted a nozzle chip 54. A control part 80 controls the operation of pulling the nozzle chip 54 out of the nozzle base part 52, based on a pressure value to be outputted from the pressure sensor 70. The control part 80 detects that the pressure value begins to lower and switches the pulling out operation from a high speed to a low speed, which can prevent a sharp drop in the pressure within the nozzle chip 54 to block the fouling of the nozzle base part 52 as caused by the splashing of a delivered residual liquid. When detecting that the pressure value reaches an atmospheric pressure, the control part 80 judges that there is no risk of splashing to accelerate the pulling out operation. This allows a low speed operation only during a period when the risk of splashing remains possible and a high speed operation during the other periods thereby shortening the treating time. |
