Abstract: The invention relates to a pH measuring device containing a reference cell which includes a tank filled with an electrolyte solution and a platinized platinum reference electrode immersed in the tank. The measuring device also contains a measuring cell. The measuring cell contains a platinized platinum measuring electrode which is immersed in the solution to be measured. The measuring device also contains a temperature regulator to ensure that the temperature is the same in the reference cell as in the measuring cell. The measuring device also contains a particle pressure regulator to ensure that the hydrogen partial pressure is the same in the reference cell as in the measuring cell and a fluid pressure regulator to ensure that the pressure is the same in the reference cell as in the measuring cell.

Abstract: The invention relates to a measuring device (1) for measuring the pH of a solution to be measured comprising: a reference cell (2) including: a tank (20) filled with an electrolyte solution; a platinized platinum reference electrode (21) immersed in the tank (20); a measuring cell (4) including: a platinized platinum measuring electrode (41) to be immersed in the solution being measured; wherein the measuring device (1) also comprises: a temperature regulator (RT) to ensure the same temperature in the reference cell (2) and the measuring cell (4); a partial pressure regulator (RPP) to ensure the same hydrogen partial pressure in the reference cell (2) and the measuring cell (4).