Endress+Hauser COS61-A2F0 – Optical Dissolved Oxygen Sensor | Oxymax COS61 Platform
Engineering Background: The Oxymax COS61 is Endress+Hauser’s luminescence-based optical dissolved oxygen sensor engineered for continuous, reliable DO measurement in demanding industrial and municipal water treatment processes. Unlike traditional Clark-cell electrochemical sensors, the COS61 eliminates electrolyte replacement and membrane fouling concerns, delivering a fundamentally lower total cost of ownership.
Product Positioning: The COS61-A2F0 variant is configured for immersion/flow-through installation with a standard Memosens digital interface, making it the preferred choice for procurement engineers specifying low-maintenance, high-accuracy DO instrumentation in aeration basins, effluent polishing, aquaculture, and process water monitoring.
Complete Technical Specifications
- Model / SKU: COS61-A2F0
- Manufacturer: Endress+Hauser (E+H)
- Series / Platform: Oxymax COS61
- Measurement Principle: Optical luminescence quenching (fluorescence-based)
- Measuring Range: 0–20 mg/L (ppm) dissolved oxygen
- Accuracy: ±0.1 mg/L or ±1% of reading (whichever is greater)
- Temperature Range: 0–50 °C (process); –20–60 °C (storage)
- Pressure Rating: Up to 10 bar (145 psi)
- Interface / Signal Output: Memosens digital (inductive, galvanically isolated)
- Sensor Cap / Membrane: Optical cap with luminophore coating (replaceable)
- Housing Material: POM / stainless steel 316L
- Process Connection: Immersion / flow-through assembly compatible
- Ingress Protection: IP68
- Cable Length: Configurable (Memosens digital cable)
- Approvals / Certifications: CE, ATEX (zone-dependent variants), WHG
- Compatible Transmitters: Liquiline CM442/CM444/CM448, Mycom S COM253
- Weight: ~300 g
- Country of Origin: Germany
Proven Application Environments
- Municipal wastewater treatment – aeration basin DO control
- Industrial effluent monitoring – pharmaceutical, food & beverage, chemical plants
- Aquaculture – fish farm oxygen management
- Drinking water production – process water quality assurance
- Biogas / fermentation – bioreactor dissolved oxygen monitoring
- Power generation – cooling water and boiler feed water monitoring
Engineering Advantages
- Maintenance-free operation: No electrolyte, no polarization time — optical principle eliminates consumables except the replaceable sensor cap.
- Memosens digital protocol: Sensor data (calibration, diagnostics, traceability) stored on-chip; hot-swap capability without recalibration at the transmitter.
- Long sensor cap lifetime: Luminophore cap rated for 12+ months in typical municipal applications.
- Drift-free baseline: Optical measurement is immune to H₂S, chlorine, and heavy metal interference that degrades electrochemical sensors.
- Plug-and-play integration: Fully compatible with E+H Liquiline platform; HART/Profibus/Modbus available via transmitter.
- Traceable calibration history: On-sensor EEPROM stores up to 10 calibration records for audit compliance.
System Architecture & Signal Flow
The COS61-A2F0 operates within the Endress+Hauser Memosens ecosystem:
- Sensor → Memosens Cable → Transmitter (CM442/CM444/CM448): Inductive, galvanically isolated digital link; immune to moisture ingress and connector corrosion.
- Transmitter → DCS/PLC: 4–20 mA HART, Profibus PA/DP, Modbus RTU/TCP, or EtherNet/IP depending on transmitter configuration.
- Asset Management: Compatible with Endress+Hauser FieldCare / DeviceCare and W@M Device Viewer for lifecycle management.
Sourcing & Quality Verification
- All units sourced through authorized E+H distribution channels or verified surplus with full traceability documentation.
- Each sensor inspected for physical integrity, connector condition, and optical cap status prior to dispatch.
- Calibration certificates and factory test reports available upon request.
- Genuine E+H part — verified against E+H W@M serial number database where applicable.
- Konmask.com specializes in industrial automation components with rigorous incoming quality inspection protocols.
Procurement Process
- Step 1: Confirm model number COS61-A2F0 matches your transmitter and installation assembly.
- Step 2: Submit RFQ via support@konmask.com or place order directly on Konmask.com.
- Step 3: Receive proforma invoice with lead time confirmation (typically 3–7 business days for in-stock units).
- Step 4: Payment via T/T, PayPal, or agreed terms; shipment with DHL/FedEx Express with full tracking.
- Step 5: Receive sensor with inspection report; 12-month warranty against manufacturing defects.
Technical FAQ
- Q: Is the COS61-A2F0 compatible with my existing Liquiline CM442 transmitter?
- A: Yes. The COS61 with Memosens interface is fully plug-and-play compatible with all Liquiline CM4xx transmitters. No additional configuration is required beyond standard sensor assignment.
- Q: How often does the optical sensor cap need replacement?
- A: Under typical municipal wastewater conditions, the luminophore cap lasts 12–18 months. Harsh chemical environments (high H₂S, strong oxidizers) may reduce cap life to 6–9 months.
- Q: Can I calibrate the COS61 in the lab before installation?
- A: Yes. Memosens sensors store calibration data on-chip. Calibrate in the lab, then install — the transmitter reads the stored calibration automatically.
- Q: What is the difference between COS61-A2F0 and other COS61 variants?
- A: The suffix encodes configuration options including cable length, process connection, and approval class. A2F0 denotes a standard immersion configuration with Memosens digital output. Contact us to cross-reference your exact application requirements.
- Q: Do you provide ATEX-certified units?
- A: ATEX variants are available within the COS61 family. Please specify your hazardous area classification (Zone 1/Zone 2) when requesting a quote.
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