| 摘要 |
PROBLEM TO BE SOLVED: To obtain a liquid-amount reader in which the readout position of an ultrasonic displacement sensor can be made to coincide with the center of the diameter of all graduated cylinders, even if the size of the graduated cylinders is changed. SOLUTION: A positioning plate 14, which is installed at the bottom part of a graduated cylinder 4, is provided. A V-groove which is formed at a common angle with reference to respective kinds of graduated cylinders is formed on the positioning plate 14. A positioning protrusion member 13, which is fitted to the face of the V-groove which is formed at the common angle, is installed. The V-groove which is formed at the common angle and the positioning protrusion member 13 are arranged, in such a way that a position in which they are fitted becomes the center of the diameter which is common to the respective kinds of graduated cylinders. In addition, a constitution wherein a reference diameter 28 whose diameter is smaller than an erect holding diameter 29 and the erect holding member 29 are made to coincide substantially with the bottom diameter of the graduated cylinder 4, and the respective diameters are made to coincide with concentric axes so as to be fixed and bonded is available. |
