The accuracy of pH measurement of boiler water with caustic treatment is badly influenced by temperature.Appropriate STC(Solution Temperature Coefficient)was needed in order to obtain accurate pH measurement when the sample temperature is much beyond 25 ℃(reference temperature).The theoretical derivation process of STC was complicated and the result uncertainty was great.Therefore,an efficient and reliable experimental method to determine the STC was presented,and the setting methods of STC value for common...