抄録
A calibration system of industrial pH meter used in chemical production process is optimized based on the Japanese lndustrial Standard Z 9090 "Measurement-General rules for calibration system" . When measuring instrument used inproduction process is calibrated,it is usually removed from the process after the process is terminated. The calibration system is changed to realize that instrument can be inspected without removed from the process by using auxiliary standard solution. Error of determining standard value of auxiliary standard solution and its influence on measurement error are estimated by orthogonal array experiments. lt is confirmed that the error variance of standard value is one five of that of pH meter measurement,and the new calibration system with inspection using auxiliary standard solution is effective.
