PH ELECTRODE PERFORMANCE UNDER AUTOMATED MANAGEMENT CONDITIONS

PH is frequently measured in laboratories, but to have confidence in t he results it is necessary to know that it was measured properly. For an electrode to give accurate results it must be treated well and cali brated correctly. In this Paper, an automated system for PH measuremen t is described; the system uses the operational pH scale and calibrate s using two or three buffer solutions, taking proper account of the ef fects of temperature on the system. The system can be programmed with standard methods and procedures to ensure that the electrode gives the best possible performance. Calibrations and measurements within the s ystem are reproducible, and the automated system is more robust than t he manual pH meter, and requires less operator time.