Apparatus for measuring the pH of a liquid

Details Apparatus for measuring the pH of a liquid Apparatus for measuring the pH of a liquid

1981-10-13

1983-09-27

Kaplan, G. L.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204422, 324438, G01N 2730

Patent

active

044067666

ABSTRACT:
An electrode for measuring the pH of a liquid at high temperatures and pressures comprises a first hollow electrode formed of the ceramic which exhibits a pH-dependent potential thereacross and a second electrode provided with a porous ceramic junction. Two flexible-walled members are in fluid communication with the hollow interior of the two electrodes and are surrounded by a chamber whose pressure is kept substantially the same as that to which the electrodes are exposed. However, the chamber is thermally insulated from the hot solution whose pH is being measured. The interiors of the hollow electrodes and the flexible-walled members are filled with the same buffered solution and measuring electrodes are disposed within each of the flexible-walled members. The construction enables the measuring electrodes to be kept at substantially room temperature, thereby reducing chemical attack thereon and eliminates errors in potential measurement due to streaming and thermal diffusion potentials.

REFERENCES:
patent: 4273637 (1981-06-01), Macdonald et al.

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