| 摘要 |
PURPOSE:To miniaturize a sample to be measured which is attached to a nozzle by detecting the liquid level in a sample container, and lowering the nozzle at the same speed as that of the descent of the liquid level. CONSTITUTION:A controller 9 generates pulses and drives a pulse motor 8. A sample nozzle 1 is lowered into a sample container 3. At this time, the nozzle 1 detects the liquid level of a sample 4 in the container 3 with a liquid-level detecting electrode 2. The result is transmitted to the controller 9. The motor 8 is stopped by the controller 9 at a position where the interval between the tip of the nozzle and the liquid level becomes a specified distance. The controller 9 drives a pulse motor 6 and sucks the sample 4 through a sample syringe 5. At the same time, pulses are imparted to the motor 8 so that the nozzle 1 is lowered at the same speed as the descending speed of the liquid level. At the same time when the sucking of the preset capacity of the sample is completed, the motors 6 and 8 are stopped. Thereafter, an arm 10 is moved to a reaction line, and the sample is separately injected. Then, measuring opera tion is started. In this way, the amount of the sample which is attached to the sample nozzle and the detecting electrode can be miniaturized to the mini mum degree. |
