The water quality phenolphthalein alkalinity analyzer developed and produced by Erun Group is specially designed for the testing of alkalinity in boiler water and circulating cooling water samples. Based on the principle of acid-base titration, the instrument calculates the phenolphthalein alkalinity value of water samples by neutralizing the standard solution of a certain concentration of acid and the phenolphthalein indicator. Erun intelligent boiler circulating water phenolphthalein alkalinity testing instrument has the characteristics of low maintenance, low reagent consumption, etc. Different reagents can be selected according to the actual working conditions on the site, so as to achieve a full range of matching from low range to high range.