Chloride ion: it has the ability to destroy the protective film. When the dissolved oxygen in the water is too high, chloride ion will accelerate the corrosion, which is easy to cause perforation and leakage of the pipeline. Hardness of softened water: the reason for scale formation in industrial boilers is that some calcium and magnesium salts react to form insoluble substances during water heating; The solubility of these calcium and magnesium salts decreased with the increase of water temperature, and precipitated after reaching the saturation concentration; After concentration, insoluble salt precipitation is formed.         Wtf2100 boiler softened water multi parameter on-line analyzer adopts dual channel analysis design, with two sample injection valves, which can analyze chloride ion and hardness content in water before and after softening treatment in sequence. Among them, the hardness is analyzed by complexometric titration, and the detection range standard is 0-500mg / L, which can be customized according to the actual water sample; The content of chloride ion in softened water is low, and turbidimetric method is used for analysis (electrode method is suitable for measuring residual chlorine). The instrument displays the pH of the water sample in real time, and automatically analyzes the chloride ion and hardness in sequence, and uploads the analysis results through three-way analog output or communication mode. If the water sample exceeds the standard, the peripheral dosing system can be customized for treatment.