Abstract: This paper analyzes the technical defects existing in the monitoring of water vapor system of generator set between traditional potentiometric pH detection equipment and current computational pH equipment in the market, and applies a number of self-developed technologies such as automatic electrical regeneration ion exchange, nonlinear temperature measurement of conductivity, variable monitoring circuit, profbus DP communication method to the computational pH detection system. A new intelligent multi-parameter calculation pH detection system is proposed, which can simultaneously monitor a number of key indicators such as electrical conductivity, hydrogen conductivity, pH and ammonia content. On the basis of ensuring the accuracy of measurement, the intelligence level is further improved and the application range is wider. It is suitable for accurate and continuous measurement of key indicators such as the conductivity of water vapor system, hydrogen conductivity, pH and ammonia content of all kinds of generator sets to improve the level of corrosion prevention and control of units.