DCC1 Free Chlorine Sensor: Reliable Monitoring for Public Swimming Pools

Water quality safety is critical in public swimming pools, and free chlorine concentration is a key parameter to ensure proper disinfection. Precise and continuous monitoring is essential.

A large public swimming pool with high daily visitor traffic must maintain free chlorine within an appropriate range to effectively eliminate bacteria and viruses. The pool uses sodium hypochlorite as the disinfectant, with pH typically maintained between 7.2–7.8 and water temperature between 25–28°C.

To meet these monitoring requirements, the DCC1 free chlorine sensor was selected. The DCC1 adopts a membrane-covered amperometric principle with an internal electronic system and a constant-potential 3-electrode design, enabling precise measurement of free chlorine in pool water. Its measuring range fully meets pool requirements. Under calibration conditions (25°C, pH 7.2 drinking water), measurement accuracy is high, with errors below 2% at both 0.4 mg/L and 1.6 mg/L, ensuring reliable data.

The sensor features automatic temperature compensation via an integrated temperature sensor, minimizing the influence of slight temperature fluctuations (sudden temperature changes should be avoided). Installed with a flow cell and retaining ring, it withstands up to 3 bar pressure. In a standard flow cell, recommended flow rate is 15–30 L/h (15–30 cm/s), with low flow dependency.

Initial startup requires approximately 2 hours. Response time (T90) is about 2 minutes. No zero-point calibration is required, and slope calibration can be easily performed using DPD-1 analysis.

With continuous monitoring by DCC1, the pool can adjust disinfectant dosing in real time, ensuring safe and hygienic swimming conditions.