Endress+Hauser COS61-A1F0 Optical Dissolved Oxygen Sensor

The Endress+Hauser COS61-A1F0 is a high-performance optical dissolved oxygen (DO) sensor engineered for the most demanding water and wastewater monitoring applications. As a core component of Endress+Hauser's Liquiline System, it sets the standard for reliability, accuracy, and low-maintenance operation in process and environmental analytics.

Advanced Technology & Key Technical Parameters

The COS61-A1F0 utilizes state-of-the-art luminescence quenching technology. Its measurement is based on the principle of phase shift detection, where a specific luminophore is excited by a modulated blue light. The phase shift of the returned red light signal, which is inversely proportional to the oxygen concentration, is analyzed to provide an exceptionally stable and accurate reading. This method is free from electrochemical interference and consumes no oxygen.

Key Technical Specifications:

• Measurement Principle: Optical (luminescence quenching)

• Measuring Ranges: 0 – 20 mg/L (ppm) and 0 – 200% air saturation

• Accuracy: Typically ±1% of reading or ±0.01 mg/L, whichever is greater

• Response Time (T90): Typically < 40 seconds

• Pressure Range: Up to 6 bar (87 psi)

• Temperature Range: 0 to 50 °C (32 to 122 °F)

• Sensor Cap Lifetime: Typically > 2 years (depending on application conditions)

• Outputs: Integrated transmitter with various digital (RS485, MODBUS) and analog options

• Certifications: IP68/NEMA 6P housing, suitable for harsh outdoor and submersion environments.

Unmatched Advantages for Your Process

The COS61-A1F0 delivers significant operational and economic benefits over traditional amperometric sensors:

1. Minimal Maintenance, Maximum Uptime: With no membranes to replace, no electrolytes to refill, and no polarization time required, the sensor drastically reduces maintenance cycles and associated costs. Its rugged design ensures long-term stability and reliability.

2. Exceptional Accuracy & No Drift: The optical principle provides a drift-free measurement, eliminating the need for frequent recalibration. It is immune to common interferences like hydrogen sulfide, pH variations, or flow velocity, ensuring consistently trustworthy data for process control and regulatory compliance.

3. Lowest Cost of Ownership: The combination of virtually no consumables, reduced labor for maintenance, and extended sensor cap life translates into the lowest total cost of ownership in the industry.

4. Easy Integration & Smart Diagnostics: Designed for the Liquiline platform, it offers seamless integration and powerful diagnostic functions. Pre-warning for cap wear, fouling detection, and comprehensive self-monitoring features enable predictive maintenance and prevent unexpected process downtime.

Ideal Applications

The Endress+Hauser COS61-A1F0 is the ideal solution for continuous dissolved oxygen measurement in:

• Wastewater Treatment (aeration basin control, effluent monitoring)

• Biological Reactors and Fermentation Processes

• River and Lake Water Quality Monitoring

• Aquaculture and Fish Farming

• Pharmaceutical and Food & Beverage Industries

Choose the Endress+Hauser COS61-A1F0 optical dissolved oxygen sensor to achieve unparalleled measurement integrity, optimize your process efficiency, and ensure compliance with confidence. Invest in a technology that works tirelessly so you don't have to.