E+H Oxymax COS41 Dissolved Oxygen Sensor

Reliable Amperometric Measuring Principle

The Endress+Hauser Oxymax COS41 is a proven potentiostatic amperometric two-electrode dissolved oxygen sensor designed for continuous process control in environmental and water engineering. Operating with a membrane-covered measuring cathode and anode, the sensor selectively reduces dissolved oxygen molecules entering through the membrane to produce a precise electrical current directly proportional to the O2 concentration in the liquid medium. This electro-chemical design ensures stable readings without interference from surrounding process factors.

Durable Design and Low Maintenance Operation

Engineered for harsh operating conditions, the Oxymax COS41 features a high-strength POM sensor body and a protective POM membrane cap fitted with a durable membrane foil. The sensor requires minimal routine maintenance due to its stable electrolyte system and easy-to-replace membrane cartridges. Air calibration is simple and fast, extending operational intervals and keeping maintenance downtime to a minimum in continuous aeration and water treatment loops.

Integrated Temperature Compensation and Flexible Integration

Equipped with an integrated NTC temperature sensor, the COS41 automatically compensates for temperature variations in real-time, ensuring accurate oxygen dissolved saturation and concentration values in mg/L or % SAT. Designed with standard G1 and NPT 3/4 process threads, it seamlessly integrates with flow assemblies, immersion pipes, and Liquisys COM223/253 transmitters across municipal waterworks, industrial wastewater facilities, and aquaculture monitoring stations.

Applications

• Wastewater Treatment Plants: O2 control in aeration basins, biological treatment stages, and outlet discharge monitoring.

• Water Works & Municipal Supply: Status monitoring of drinking water oxygen enrichment and raw water quality in rivers, lakes, or reservoirs.

• Industrial Water Utilities: Biological treatment monitoring and process water quality control across chemical, power, and manufacturing plants.

• Aquaculture & Fish Farming: Continuous DO monitoring and oxygenation control for optimal growth conditions.

Specifications

• Measurement Principle: Closed membrane-covered amperometric 2-electrode sensor.

• Measured Parameters: Dissolved oxygen (mg/L, % SAT, or hPa) and temperature.

• Measurement Range: 0.05 to 20 mg/L (0.05 to 20 ppm).

• Operating Temperature: Max. 50°C (122°F).

• Operating Pressure: Max. 10 bar (145 psi).

• Temperature Sensor: Integrated NTC temperature sensor for automatic temperature compensation.

• Sensor Body Material: POM (Polyoxymethylene).

• Membrane Cap Material: POM with specialized membrane cartridge.

• Process Connection: G1 thread or NPT 3/4 thread.

• Cable Connection: Fixed cable (7 m / 15 m) or TOP68 plug-in head.

FAQ

• Q: How is the Oxymax COS41 calibrated? A: The sensor features simple air calibration in ambient air or air-saturated water, requiring minimal setup time.

• Q: Is the Oxymax COS41 suitable for continuous immersion in aeration tanks? A: Yes, when mounted in an immersion assembly (e.g., CYA611 or swing-chain assembly), it is designed for continuous operation in turbulent aeration basins.

• Q: What transmitters are compatible with the Oxymax COS41 sensor? A: The analog COS41 connects directly to compatible dissolved oxygen transmitters such as the Endress+Hauser Liquisys COM223 and COM253 series.

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