The online pH meter electrode should adopt a self-cleaning method
Industrial pH meters are used for continuous measurement of industrial processes, which not only require measurement display functions, but also alarm and control functions, as well as considerations for installation, cleaning, anti-interference, and other issues.
The online pH meter electrodes should be self-cleaning. Along with the widespread use of online pH meter electrodes in the industrial field, the degree of contamination varies depending on the measuring medium, so the cleaning methods used for online pH meter electrodes are also different.
Online acidity meter, if the measuring medium is relatively clean (such as boiler feed water is saltwater free), the pollution level of the pH meter is relatively light. The electrode can be regularly removed for cleaning based on experience. But this method is increasingly being used less and less in online detection. Due to manual cleaning not only being labor-intensive and time-consuming, but also interrupting measurement and affecting automatic detection, it is advisable to use automatic cleaning for online pH meters. Anhui Secco Environmental Protection Technology's online acidity meter and industrial pH meter electrodes adopt an automatic cleaning method combining ultrasonic cleaning and solution spray cleaning.
1. Ultrasonic cleaning
Install a device near the pH meter probe that can generate ultrasonic waves to automatically clean the pH electrode. The strength of ultrasound is achieved by adjusting the oscillation frequency of ultrasound. It is installed vertically, with the ultrasonic probe installed below the electrode.
2. Solution spray cleaning
There is a cleaning nozzle installed near the electrode assembly. According to the cleaning requirements, the nozzle regularly sprays water or other solutions (such as low concentration hydrochloric acid, nitric acid solution) to remove pollutants on the electrode by flushing or dissolving. The self-cleaning system used is equipped with a dilute HNO3 solution with a mass fraction of 1% as the cleaning solution, and the spray pressure is generally higher when using water. The injection of the solution is controlled by a programmable controller. During spraying, the online pH meter needs to be able to control the output to remain unchanged at the value before cleaning, that is, lock the instrument output at this time, and maintain the instrument output unchanged during cleaning. After the pH value of the solution stabilizes after cleaning, the pH meter can then detect and output. In summary, the combination of ultrasonic cleaning and solution spray cleaning is effective in cleaning the electrodes of industrial online pH meters.
