Install a pH meter for the circulating water

If the pressure of the circulating water used as the heat transfer medium is higher than that of the corrosive medium, it is generally unlikely that the medium with higher pressure will be contaminated by the one with lower pressure; therefore, in theory, there may be no need to install an additional pH meter in the circulating water used for heat transfer. However, to better monitor the system’s condition and detect potential leaks or corrosion issues promptly, it is still recommended to install pH meters in the system, especially in environments with a risk of corrosion. This allows for more comprehensive control and ensures the safety and operational efficiency of the equipment. .

Firstly, the pH measurement value is not a quantity that is related to pressure; changes in medium pressure have little effect on pH. From the perspective of medium conduction, it is theoretically impossible for the medium on the low-pressure side to enter the high-pressure side through small channels; this is only theoretical or apparent. However, the leakage of substances is related not only to pressure but also to the chemical potential after contact with the material. In other words, a system with a higher chemical potential will tend to diffuse or permeate into a system with a lower chemical potential. If, under certain conditions, the pH-related components in the system with a higher chemical potential can be transferred to the system with a lower chemical potential, this will result in a change in pH. Such examples are common in chemical processes, such as oxygen in the atmosphere penetrating into pure water with very low dissolved oxygen concentrations, or water vapor in humid air penetrating into pipelines under high pressure. The same phenomenon can occur with pH as well; it is recommended to install an online pH analyzer as required, so as to monitor the changes in the pH value of the circulating water in real time.