ABSTRACT
The measurement of pH is an indicator of an incredibly wide range of extremely dilute acid and base concentrations. The pH measurement system must be designed to prevent violations from spurious readings due to installation effects. The cost of the Glasteel electrode is higher than that of any other pH electrode. Electrolyte contamination causes large shifts of the pH measurement. Process material must work its way up into the innermost wooden dowel where the internal silver-silver chloride element resides to cause a drastic offset in the pH reading. The buffer solution is chosen to be compatible with the process fluids to insure a constant buffer pH and constant reference potential. A pH electrode is usually serviced only if it deviates from the median pH by more than a pH unit for more than several minutes. In pH measurement systems a pH responsive glass takes up hydrogen ions and establishes a potential at the glass surface with respect to the solution.
