| 摘要 |
PURPOSE:To simply measure a density and to eliminate the necessity of management of reference liquid. CONSTITUTION:A density measuring device is provided therein with a paralellepiped cell part 10. A cave part 11 composed of a first cave part 11a having a diameter of 5mm and a second cave part 11b having a diameter of 3mm is formed at a position in the vicinity of the left end part of the cell part. Storage recesses 12a to 12c for receiving a reference electrode 15, a natrium electrode 16 and a kalium electrode 17, are formed in the right surface of the cell part, and they are opened at their front ends to the cave part. A plug 20 is composed of a disc-like lid 10a having a diameter lager than that of the outer diameter of the first cave part, a first cylindrical part 20b having a diameter substantially equal to the outer diameter of the first cave part, and a length shorter than the depth of the first cave part, and a second cylindrical part 20 having a diameter substantially equal to the outer diameter of the second cave part, which reaches the second cave part when it is inserted. When the lid is inserted into the cave part, a space K and a space K2 are defined respectively in the first and second cave parts. With this isolated spaces, the electrodes can be prevented from deteriorating. |
