| 摘要 |
PURPOSE:To prevent the change in the compsn. of an internal liquid and to maintain always stable electrode potential for a long period by forming an internal liquid introducing port and an internal liquid discharge port to a vessel having a liquid junction part and contg. an electrode body. CONSTITUTION:The internal liquid introducing port 2b is formed near the electrode body 5 of the vessel 2 contg. the electrode body 5 consisting of a silver rod 4 and having the aperture 2a for liquid junction connecting to a coated pipe 8 having the top end opened into a liquid 18 to be measured and the internal liquid discharge port 2c is formed near the aperture 2a. The port 2b is connected to a liquid storage tank 11 for the internal liquid 6 by a pipe 12 and a liquid feed pump 13 is disposed to the mid-way of the pipe 12. The liquid 18 is thus prevented by the flow of the liquid 6 shown by an arrow line from arriving at the neighborhood of the body 5 and is discharged through the discharge port 2c even if the liquid 18 enters the internal liquid through the liquid junction part 10. The change in the compsn. of the internal liquid is thus prevented and the stable electrode potential is maintained. |
