Endress+Hauser CPS91E-AA7BTH2 Advanced Chlorine Dioxide Sensor

The Endress+Hauser CPS91E-AA7BTH2 is a high-performance amperometric sensor designed for the continuous and reliable measurement of chlorine dioxide (ClO₂) in water disinfection applications. Engineered with Endress+Hauser’s proven field-effect technology, this sensor delivers exceptional accuracy and stability in critical processes across municipal drinking water treatment, pharmaceutical production, food and beverage industries, and industrial wastewater management.

Key Technical Parameters

Measurement Principle: Amperometric, 3-electrode system with gold working electrode

Measuring Range: 0 to 5 mg/l (ppm) ClO₂

Accuracy: Typically ±2% of measured value or ±0.02 mg/l, whichever is greater

Response Time (T90): <90 seconds

Temperature Range: 0 to 50 °C (process); 0 to 45 °C (ambient)

Pressure Range: 0 to 6 bar at 25 °C

pH Range: 2 to 9 pH

Sensor Life: Typically 2 years under normal operating conditions

Output: Compatible with Endress+Hauser Liquiline series transmitters

Mounting Options: Direct immersion or flow-through installation

Core Advantages & Features

1. Unmatched Selectivity and Minimal Interference

The CPS91E-AA7BTH2 utilizes a proprietary membrane and optimized electrode potential to specifically measure chlorine dioxide with minimal cross-sensitivity to free chlorine, chlorite, chlorate, or pH fluctuations. This ensures reliable readings even in complex water matrices.

2. Enhanced Stability with Advanced Technology

The integrated field-effect sensor design significantly reduces zero-point drift and minimizes the need for frequent calibration. This translates to lower maintenance, reduced reagent consumption, and more consistent process control.

3. Robust Construction for Demanding Environments

Featuring a durable, chlorine-resistant PPS body and a PTFE-coated gold measuring electrode, this sensor is built to withstand harsh chemical environments and ensure long-term operational reliability.

4. User-Friendly Operation

With a pre-filled, maintenance-free electrolyte system and a simple membrane cap replacement procedure, the CPS91E-AA7BTH2 simplifies upkeep and reduces total cost of ownership. Its plug-and-play design allows for quick sensor replacement without complex reconfiguration.

5. Seamless System Integration

The sensor is designed for full compatibility with Endress+Hauser’s Liquiline CM44x and other transmitters, enabling easy integration into existing control architectures for comprehensive water quality monitoring and data logging.

Ideal Applications

Drinking Water Treatment: Precise ClO₂ dosing control for safe disinfection.

Food & Beverage: Process water disinfection ensuring product safety.

Pharmaceuticals: High-purity water (HPW) and water for injection (WFI) systems.

Industrial Water: Cooling water and process water disinfection.

Wastewater: Final effluent disinfection before discharge.

Conclusion

The Endress+Hauser CPS91E-AA7BTH2 chlorine dioxide sensor sets the standard for accuracy, reliability, and ease of use in disinfection monitoring. By combining innovative electrochemistry with robust engineering, it provides plant operators with a trusted solution for optimizing disinfection processes, ensuring regulatory compliance, and safeguarding water quality.