| 摘要 |
PURPOSE:To perform the simple quantitative estimation of a sample right after being passed through the small detection hole of a detection pellet and to prevent an error in the plural-time detection of particles by providing a suction pipe at the upper side of the small detection hole of the detection pellet, and providing a cleaning pipe and connecting its upper end to a diluting liquid tank. CONSTITUTION:The detection pellet 2 which has the small hole for detection at the lower end is provided in a cylindrical detector 3 and a particle suspension is sucked through the small hole; and particles are detected on the basis of the difference in electric impedance between the suspension and particles when the particles pass through the small hole and converted into an electric signal by electrodes 4 and 5 provided inside and outside the detector 3. On the other hand, a suction pipe 6 is provided at the upper side of the small hole of the detection pellet 2 so that its lower end is positioned with a slight gap. A communication hole 7 is formed in the detector above the suction pipe 6 and a cleaning pipe 11 is provided in the detector so that its lower end is positioned nearby the detection pellet. The upper end of the cleaning pipe 11 is connected to the diluting liquid tank 8 through an on-off valve 10. Thus, diluting liquid is caused to flow to the suction pipe port and circulates to outside the suction pipe 6 through the communication hole 7. |
