Oxymax COS41
Membrane-Covered Amperometric Dissolved Oxygen Sensor with Long-Term Stability
Applications
The Oxymax COS41 is designed for dissolved oxygen measurement in:
• Clean water treatment
• Wastewater treatment plants
• Water quality monitoring (rivers, lakes, oceans)
• Aquaculture/fish farms (oxygen level control)
Key Features
✓ High measurement accuracy
✓ Extended maintenance intervals (up to 12 months)
✓ Intelligent self-monitoring function
✓ Membrane-covered measurement technology:
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Excellent O₂ selectivity
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Low maintenance costs
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Simple air calibration
Measurement Principle
Dissolved oxygen molecules diffuse through the membrane to the cathode where they are reduced to hydroxide ions (OH⁻), while silver at the anode oxidizes to silver ions (Ag⁺), creating a silver bromide layer. The resulting current is proportional to oxygen concentration.
Complete Measurement System Includes:
• DO probe
• Transmitter (e.g., Liquisys M COM 223/253)
• Special measurement cable
• Mounting accessories (flow assembly COA250, submersion assembly CYA611, retractable assembly COA451)
Technical Specifications
| Parameter | Value |
|---|---|
| Measuring Range | 0.05-20 mg/L (ppm), 0-200% SAT, 0-400 hPa |
| Response Time | T90: 3 min (20°C) |
| Accuracy | ±1% of reading (per IEC 746-1) |
| Resolution | 0.01 mg/L |
| Long-term Drift | <1%/month |
| Materials | POM housing, gold cathode, silver/silver bromide anode |
| Process Connection | G1″ or NPT 3/4″ |
| IP Rating | IP68 (30 days @ 10m water column) |
| Temperature Range | -5 to +50°C (process), -20 to +60°C (storage) |
Installation Notes
• Maximum cable length: 50m
• Do not install at extreme angles
• Not suitable for vacuum conditions
