Why and how to monitor the pH value of circulating cooling water?

Circulating cooling water requires the use of an online pH analyzer to monitor the pH value, because the pH value can affect the corrosion and precipitation of the cooling water. If the pH value of the cooling water is too high or too low, it will lead to increase corrosion of metal pipes and equipment. It will also affect the formation of scale and sediment in the cooling water, reduce the cooling effect, and increase energy consumption and maintenance costs. Therefore, monitoring and adjusting the pH value of cooling water can effectively protect equipment and extend the service life of equipment. It can also improve cooling efficiency and reduce energy consumption and maintenance costs. So how to monitor the pH value of circulating water? An online Ph Controller paired with a Ph Sensor can achieve accurate and stable measurement and provide real-time feedback on the pH value of water quality.

Generally, the pH control range of circulating water is between 7 and 9. If the pH value of circulating water is lower than 7, corrosion will be accelerated. If the pH value of circulating water is higher than 9, scaling will be accelerated. You can use a pH analyzer to monitor circulating water online and find problems in time. Delfino focuses on the R&D, and production of water quality analysis instruments. The main products include Ph Orp Analyzer, Conductivity Analyzer, Turbidity Analyzer, Cod Analyzer, Dissolved Oxygen Analyzer, ammonium analyzer, chlorine analyzer. Based on our many years of practical experience. The reasons for abnormal pH value of circulating cooling waer are:

1. In the circulation system that adds acid to adjust the pH value, too much acid may be added.

2. The amount of chlorine or medicine added is too large.

3. The process medium leaks into the circulating water, directly or indirectly causing abnormal pH value.

4. The influence of the cooling tower operating environment, such as the air entering the cooling tower containing a large amount of chlorine dioxide, ammonia, etc.

5. Poor water quality control allows sulfate bacteria or nitrate bacteria to multiply and cause abnormal pH value.

On the premise of using reliable pH controllers and pH sensors for measurement, the solution is:

adjust the pH value of circulating water to return the pH value to the normal control range as soon as possible; when the pH value of circulating water is less than 2.5, the circulating water can be adjusted to the range of 2.5~3.0 by adding NaOH to the water. Then add sodium carbonate solution toincrease the pH of the circulating water to about 4.5. At this time, the concentration of free inorganic acid in the circulating water decrease to zero. The corrosion rate of carbon steel is greatly reduced.

To remove dirt-forming substances, when the pH value of circulating water reaches above 4.5, the focus is to remove corrosion products from the system. The only way to remove dirt is to blow down, increasing the blowdown rate to maximum. To achieve this kind of automatic pH adjustment and control, you need to use the relay function of online pH controller. Daruifuno pH controller has two settable SPST relays. Users can set the on value and off value according to their own needs. At this time, the controller will control the dosing pump, automatically control the addition of acid or alkali, and control the pH value of the solution within a certain range.