High Pressure pH Sensor for Oceanographic Applications

Abstract

A high pressure p_H sensor has been developed and tested in the laboratory to a pressure of 150 kg/cm² and in the ocean to a depth of 270 m. The sensor is composed of specially designed glass membrane and reference electrodes. A pressure equalizing technique is used to prevent pressure gradients across the walls of the electrodes. Seawater buffer was used to calibrate the sensor for oceanographic application resulting in 0.02 p_H units reproducibility.