The SUP-MCA-CL2 Online Residual Chlorine Analyzer is an intelligent water quality monitoring instrument designed for continuous residual chlorine measurement. Using a reagent-free electrochemical three-electrode amperometric measurement system, it provides stable and accurate chlorine monitoring without chemical consumption or pollutant discharge. The integrated flow-through design with wall-mounted installation simplifies system integration, maintenance, and long-term operation. It is widely used in drinking water treatment, distribution networks, swimming pools, and industrial water quality monitoring applications.