Endress+Hauser COS41-4F The Advanced Optical Dissolved Oxygen Sensor

The Endress+Hauser COS41-4F is a high-performance, optical dissolved oxygen sensor designed for continuous monitoring in challenging water and wastewater treatment processes. Utilizing advanced luminescent technology, it delivers exceptional reliability and accuracy where traditional sensors fail. This robust sensor is the ideal solution for aeration control, process optimization, and compliance monitoring in municipal and industrial settings.

Key Technical Parameters

Measurement Principle: Luminescence quenching (optical)

Measurement Range: 0 … 50 mg/l O₂ / 0 … 500% saturation

Accuracy: ±0.1 mg/l (< 20 mg/l) / ±1% of reading (> 20 mg/l)

Response Time (t90): Typically < 40 seconds

Pressure Range: 0 … 16 bar abs

Temperature Range: Process: 0 … 60 °C (32 … 140 °F); Storage: -20 … 60 °C (-4 … 140 °F)

Sensor Body Material: PVDF (Kynar®), optionally stainless steel 1.4404 / 316L

Membrane Cap Material: Special FEP

Communication & Output: Integrated sensor electronics with digital Memosens protocol; analog 4…20 mA HART® 7 option

Certifications: ATEX, IECEx, FM, CSA, NEPSI for hazardous areas

Core Advantages and Benefits

1. Unmatched Reliability with Optical Technology

Unlike conventional electrochemical sensors, the COS41-4F requires no electrolytes, membranes, or anode/cathode cleaning. It eliminates polarization time, features minimal maintenance, and is unaffected by typical wastewater sulfides or flow variations, ensuring stable, drift-free measurements.

2. Memosens Digital Technology for Future-Proof Operation

Memosens ensures contactless, corrosion-free signal transmission. It enables comprehensive data storage (calibration, process conditions, sensor history) directly in the sensor head for predictive maintenance and superior process documentation.

3. Extreme Durability in Harsh Environments

Constructed with chemical-resistant PVDF and a robust FEP membrane cap, the sensor withstands abrasive and fouling conditions. Its design features a self-cleaning mechanism that reduces maintenance intervals significantly.

4. Simplified Operation and Reduced Lifetime Cost

The "plug and measure" capability thanks to Memosens allows for easy pre-calibration and sensor replacement without process interruption. The lack of consumables and extended service intervals dramatically lower the total cost of ownership.

5. Seamless Integration and Versatility

The sensor integrates perfectly with Endress+Hauser transmitters and automation systems. It is suitable for a wide range of applications, including activated sludge basins, oxidation ditches, and industrial effluent monitoring.

Conclusion

The Endress+Hauser COS41-4F sets the standard for reliable dissolved oxygen measurement. By combining maintenance-free optical technology with robust digital design, it provides unparalleled accuracy, reduces operational workload, and ensures optimal process control for improved efficiency and regulatory compliance. Choose the COS41-4F for a smarter, more reliable approach to critical oxygen monitoring.