In order to measure pH under high pressure, the writers have made a small type Li glass electrode, ca. 6mm. dia., 130mm. long. Electric insulation at the leading terminal from autoclave is necessary to be maintained as high as possible.
The pressure difference between inside and outside the reference electrode was compensated by using the tripple tube that has 0.5-1mm. dia. holes. Both pressure and electric leakages were prevented by means of a small copper guard and teflon packing.
When pH variation of standard buffer solution of various kinds (N.B.S.) was measured under 0 to 70kg/cm² pressure of N₂, CO₂ and water gas respectively, considerable variation was observed under CO₂ gas, while no variation occurred under N₂ and water gas. By this method, pH was measured under the pressure up to ca. 100kg/cm².

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Process control engineers confront many difficult problems in applying automatic pH control to chemical processes by using conventional controllers.
The method of pH control with pump, which is given in this report, is very useful for solving the difficulties. The validity of the control with pump is also outlined.

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Upon measuring or controlling pH with glass electrode pH meter in chemical plants, care should be taken as to whether or not the measuring solution is grounded. For, the solution in pipe, tank etc., has generally the electric potential against the ground and sometimes A.C. or D.C. leakage current flows through the solution.
By this reason, it becomes difficult to keep the pH indication stable and accurate. The writer, with glass electrode pH meter, measured pH of the solutions under the various conditions as described above, and gave their effects and the method through which stable and accurate pH indication was obtained.

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