Technical Data
CompareOxygen
| Measuring Principle | Optical oxygen measurement |
| Application | Aeration tank, river monitoring, water treatment, fish farming |
| Characteristic | Digital, optical measurement of dissolved oxygen based on fluorescence quenching Measurement possible in still water |
| Measuring range | 0 to 20 mg/l 0 to 200 %SAT 0 to 400 hPa |
| Measuring principle | Oxygen-sensitive molecules (marker) are integrated in an optical active layer (fluorescence layer). The fluorescence layer surface is in contact with the medium. The sensor optics are directed at the back of the fluorescence layer. The sensor optics transmit green light pulses to the fluorescence layer. The markers respond (fluoresce) with red light pulses. The duration and intensity of the response signals depend directly on the oxygen contents or partial pressure. |
| Design | Calibration data saved in sensor High degree of EMC protection |
| Material | Sensor shaft: stainless steel 1.4571 Membrane cap: POM |
| Dimension | Diameter: 40 mm (1.57 inch) Shaft length: 186 mm (7.32 inch) |
| Process temperature | -5 to 60 °C (20 to 140 °F) |
| Process pressure | Max. 10 bar abs (Max. 145 psi) |
| Temperature sensor | NTC 30K |
| Connection | Process connection: G1, NPT 3/4" Cable connection: fixed cable or TOP68 plug-in-head |
The Oxymax COS61D is a high-performance digital dissolved oxygen sensor that provides fast, precise and drift-free measurement, with low maintenance, high suitability and simple operation. The long-term stable fluorescence layer of the sensor is oxygen-selective (interference-free), ensuring always reliable measurement. Using Memosens digital technology, the Oxymax COS61D also offers maximum process and data integrity and is easy to operate. Laboratory calibration and device predictive maintenance are possible.
Advantages
Minimum maintenance requirements, maximum suitability
Fast, drift-free measurement for precise aeration control and process monitoring
Long-term stable measurement increases process safety
Optimum measurement performance for various aeration processes (SBR, Anammox, etc.)
No chemical reagents: no electrolyte handling
Areas of application
The Oxymax COS61D is used for dissolved oxygen concentration measurement:
Wastewater treatment plants:
- O2 aeration basin control
- Process water treatment and monitoring
Waterworks:
- Drinking water status monitoring (oxygen enrichment, corrosion protection, etc.)
- Water quality monitoring of rivers, lakes or seawater
Utilities:
- O2 biological treatment control
- Process water treatment and monitoring
Fish ponds:
- O2 control for optimum growth conditions
Spare Parts & Accessories 16
16 spare parts · click to collapse
| Order code | Description | |
|---|---|---|
| COV61- | COV61 Maintenance kit COS61/COS61xMaintenance parts for COS61/COS61x. Include membrane caps, o-rings and further materials for maintenance. | Enquire |
| 51518598 | Sensor membrane cap, COS61, COS61D, 1 pcSuccessor kit COV61 | Details |
| 51518597 | Sealing set, sensor COS61, COS61D, 2 piecesSealing set, Sensor COS61, 2 pieces | Details |
| 71495128 | Kit COSxx Standard Protective Cap | Details |
| 50053276 | Protective cage for COS31/41/51D/61/71protection cage | Details |
| 71495130 | COSxx Dissolved Oxygen Sensor Protective Cap for Fish Farm Aquaculture Applications | Details |
| 50081787 | COY 3-SK membrane protective basketfor immersion of diss. oxygen sensors COS31/41/51D/61 in fish ponds. | Details |
| 71495126 | COSxx 8.5 mm aperture cage-type dissolved oxygen sensor protective cap | Details |
| 51518599 | COS31/41/51D/61/71 calibration capCalibration cap, COS31/41/61/71 | Details |
| 71110801 | Cleaning head COS61/61D 6/8mm | Details |
| 71110802 | Cleaning head COS61/61D 1/4" | Details |
| 71072583 | *** cleaning unit, 230V air compressor | Details |
| 71194623 | Output Air Purification | Details |
| COY8- | Zero-Point Gel COY8Zero point: Verification, calibration, adjustment at zero point of oxygen and disinfection sensors ::Amperometric and optical sensors ::12, 25 and 40mm diameter ::Application in the lab, in the field | Enquire |
| 51500832 | Terminal box RMto lengthen the cable for Memosens/CUS31/41. Protection class IP 65, with 2x Pg 13.5 | Details |
| 50001041 | DO/Chlorine Sensor Zero-Point Calibration PowderChemical producing water free of oxygen or chlorine for test purposes. | Details |
Configurator / Comparison
Measuring principle video
Click to playSource:Endress+Hauserwebsite public information
Manuals & Documents 6
All documents for this modelCase Studies
Municipal Wastewater Treatment · dissolved oxygen — Application Case
Site Conditions
This is a Municipal Wastewater Treatment customer whose plant is at the inlet, biological and outlet stages of a municipal plant. The main task was measuring dissolved oxygen for biological processes and deaeration control.
The Problem
The difficulty lies in high solids and corrosive fractions, with large diurnal flow swings; at the same time effluent parameters drift and probes foul with sludge and biofilm. Specification therefore means choosing membrane or optical sensors by basin depth and cleaning method.
What We Did
We took a analyser range approach — selecting as part of a complete water-analysis system. Delivery was built around choosing membrane or optical sensors by basin depth and cleaning method, with point-by-point checks on: stable compliance with Grade 1A discharge limits and online data reporting.
Operating Outcome
In service the system performs as intended — blowing follows oxygen demand, cutting aeration power noticeably, with routine maintenance falling noticeably.
Food & Beverage · dissolved oxygen — Application Case
Application Context
dosing, pasteurising, filling and CIP stages is a typical Food & Beverage duty. The project started from dissolved oxygen, focusing on measuring dissolved oxygen for biological processes and deaeration control.
Process Constraints
frequent cleaning demands instruments that withstand hot CIP/SIP caustic cycles, and syrups, dairy and beverages that scale easily, under strict hygienic requirements only amplify it. The dissolved oxygen specification must therefore cover choosing membrane or optical sensors by basin depth and cleaning method.
Delivery Approach
Delivery was handled as the analyser range — selecting as part of a complete water-analysis system. Execution centred on choosing membrane or optical sensors by basin depth and cleaning method, together with food-safety and hygienic design per 3-A / EHEDG.
Field Results
Operation shows the benefit clearly — blowing follows oxygen demand, cutting aeration power noticeably, with confidence in this measuring point improving markedly.
Chemical & Pharmaceutical · dissolved oxygen — Application Case
Customer Profile
The typical setting in Chemical & Pharmaceutical is reactors, metering vessels and finished-product tanks. The measuring point is dissolved oxygen; the focus is measuring dissolved oxygen for biological processes and deaeration control.
Key Difficulties
Conditions are highly corrosive media with solvents and crystallisation, partly in explosive atmospheres and, on top of that, corrosion plus Ex protection shortens instrument life and makes downtime costly, which a standard configuration cannot handle for long. The design therefore starts with choosing membrane or optical sensors by basin depth and cleaning method.
Implementation
The scope ran through the analyser range: selecting as part of a complete water-analysis system. Technically it hinges on choosing membrane or optical sensors by basin depth and cleaning method, and on these requirements: Ex certification and GMP traceability of records.
Customer Benefit
In practice this means blowing follows oxygen demand, cutting aeration power noticeably, which cut the workload on the site maintenance team.
Power & Energy · dissolved oxygen — Application Case
Project Background
The project covers boiler feedwater, turbine condensate and FGD/DeNOx systems. The work centres on dissolved oxygen and the core task is measuring dissolved oxygen for biological processes and deaeration control.
Operating Challenges
The medium and duty are characterised by high temperature and pressure with both steam and saline water, and drift under high temperature and pressure, with very costly unplanned outages. So dissolved oxygen cannot be specified generically — it calls for choosing membrane or optical sensors by basin depth and cleaning method.
Solution
The Ainstru engineering team worked through the analyser range: selecting as part of a complete water-analysis system. The configuration involves choosing membrane or optical sensors by basin depth and cleaning method, with these requirements in view: compliance with power-industry codes and unit availability targets.
Results
Since start-up the system has run steadily; the practical result is blowing follows oxygen demand, cutting aeration power noticeably.
Related Products
Endress+HauserLiquisys M COM223
Endress+HauserOxymax W COS41
Endress+HauserOxygen sensor OXYMAX-W COS61
Endress+HauserDissolved oxygen sensor
Endress+HauserOxymax W COS51D
Endress+HauserLiquisys M COM253
Endress+HauserMemosens COS51E
Endress+Hauser