Endress+Hauser CCS51-AA11AD03 | Analog Free Chlorine Sensor, 0-5 ppm, 3m Cable

Endress+Hauser CCS51-AA11AD03 analog free chlorine sensor. Measures 0-5 mg/L HOCl (trace range), amperometric principle, 3m fixed cable, IP68, for drinking & process water.

Product Overview

The Endress+Hauser CCS51-AA11AD03​ is an analog amperometric sensor​ for precise measurement of free chlorine (HOCl)​ in water treatment. It covers the 0–5 mg/L (ppm) trace range, ideal for monitoring low residual levels in drinking water and disinfection processes. The sensor features a PVDF membrane, integrated 10 kΩ NTC temperature sensor, and a 3-meter fixed cable​ for direct connection to compatible transmitters like the Liquisys series.

Technical Specifications (Measurement & Electrical)

Technical Specifications (Mechanical & Process)

Key Features

• Trace-Level Accuracy:​ Optimized for low-range 0–5 ppm free chlorine​ measurement, critical for drinking water disinfection compliance and residual monitoring.

• Robust Membrane Design:​ PVDF membrane cap​ and POM body​ provide high chemical resistance to chlorine, ozone, and aggressive water matrices, reducing fouling.

• Integrated Temperature Compensation:​ Built-in NTC 10 kΩ​ sensor ensures accurate readings across the operating temperature range.

• Ready-to-Install:​ 3-meter fixed cable​ simplifies field wiring and reduces connection failure points compared to separate plug systems.

Applications

• Drinking Water Treatment:​ Residual free chlorine monitoring in municipal waterworks and distribution networks.

• Swimming Pool & Spa:​ Disinfection control and dosing optimization.

• Process Water & Cooling Towers:​ Biofilm and legionella prevention in industrial water systems.

• Wastewater Reuse:​ Effluent disinfection monitoring.