Pure water pH online determination device and method thereof

The invention discloses a pure water pH online determination device and a method thereof, according to the Collabour ion independent movement law, a model among the pH, conductivity and hydrogen conductivity of a water sample is established, and the model is also applicable no matter whether the sample contains carbon dioxide or not. The invention further provides a pure water pH online measuring device, the pH value of a water sample can be calculated according to the hydrogen conductivity and conductivity measuring results of water and steam samples of a thermal power plant, and the pH value is calculated according to data of the conductivity electrode and the hydrogen conductivity electrode. The invention solves the problems of short service life, unreliable measured value and large maintenance amount when the traditional pH electrode measurement method is used for measuring the pH value of water and steam in a thermal power plant, and can be applied to the measurement of a water vapor sample containing ca