DULCOTEST® Amperometric Sensor The proven diaphragm-covered standard sensor for free chlorine CLE3 is used to monitor or control all types of clear water. The variant CLE3.1 is especially suitable for an excess of combined chlorine, the calculation of combined chlorine from the measurement of total chlorine and free chlorine. Features and Benefits • Measuring range: 0.10 - 10.0 mg/L • Temperature range: 5°C to 45°C • Maximum pressure 1.0 bar • pH range 5.5 to 8.0 • Resistant to salts, acids and alkalis Product Application Information • CLE 3 mA-2.0/10 ppm: Swimming pools Chlorine measurement in potable, swimming pool, cooling, industrial, process, rinsing and waste water as well as seawater and salt water.