Multi-Parameter Drinking Water Analyzer

pH:
The pH value is determined by collecting the potential difference between a reference electrode and a glass hydrogen ion-selective electrode, along with the thermistor value. The temperature is obtained from the thermistor, and the potential is converted to a pH value using the Nernst equation:
E = E₀ − 2.303 × t × log(C_H⁺)

Residual Chlorine:
A constant potential is applied between the measuring and reference electrodes. Two platinum electrodes (working and counter electrodes) form a micro-current measurement system with the reference electrode. Hypochlorous acid undergoes a redox reaction on the surface of the working electrode, and the resulting current is measured. The residual chlorine concentration is then calculated based on the correlation between current intensity and chlorine concentration. Simultaneously, temperature and pH of the water are measured and used for signal compensation to obtain an accurate residual chlorine concentration.

Low Turbidity:
A laser beam is directed vertically from air into the water, where it is scattered by suspended particles. A photodetector positioned at a 90-degree angle to the incident light captures the scattered light. The turbidity analyzer converts the intensity of the scattered light into a turbidity value based on a calibration curve that correlates light intensity with turbidity concentration.