Technical Data
CompareOxygen
| Measuring Principle | Amperometric oxygen measurement |
| Application | Typical applications are: - Wastewater treatment plants: oxygen control in aeration basin, process water treatment and monitoring . - Water plants: status monitoring of drinking water, water quality monitoring in rivers, lakes or seas . - Utilities of all industries: Oxygen control in biological treatment, process water treatment and monitoring. |
| Characteristic | Digital amperometric 3-electrode longterm-stable sensor to measure dissolved oxygen |
| Measuring range | 0.01 to 100 mg/l 0.00 to 1000 %SAT 0 to 2000 hPa |
| Material | Sensor shaft: POM Membrane cap: POM Working electrode: Gold Counter and reference electrode: silver/silver halide Membrane: ETFE (COS51-TN), FEP (COS51-TF) |
| Dimension | Diameter: 40mm (1.57 inch) Shaft length: 146 mm (5.74 inch) |
| Process temperature | -5 to 60 °C (20 to 140 °F) |
| Process pressure | Max. 5 bar abs (Max. 72.5 psi abs) |
| Temperature sensor | NTC 30k |
| Ex certification | With ATEX, IECEx, CSA C/US, NEPSI, JapanEx and INMETRO approval for use in Zone 0, Zone 1 and Zone 2 hazardous areas. With CSA C/US approval also in Class I Division 1 hazardous areas in the Gas Ex area. Additionally suitable for Class I Division 2. |
| Connection | Inductive, contactless connection head with Memosens 2.0 technology |
| Ingress protection | IP 68 |
Applications
The Memosens COS51E is particularly suitable for all kinds of wastewater treatment and utility applications and can measure in hazardous areas. The sensor offers high measurement accuracy; humid environments do not interfere with the measurement results, making the process safer. The COS51E uses Memosens 2.0 digital technology. A large number of calibration and process parameters are stored in the sensor, making it the perfect basis for predictive maintenance and IIoT technology. Low maintenance and long service life make the sensor extremely cost-effective.
The Memosens COS51E dissolved oxygen sensor is suitable for:
Wastewater treatment plants:
- Oxygen input control in aeration basins (O2)
- Process water treatment and monitoring
Utilities:
- O2 control in biological treatment processes
- Process water treatment and monitoring
Waterworks:
- Drinking water condition monitoring (oxygen enrichment, corrosion protection, etc.)
- Water quality monitoring of river, lake or sea water
The sensor can measure in hazardous areas (ATEX, FM, CSA).
Benefits
Wide measuring range: membrane-covered measuring principle with cathode design; the sensor is suitable for all kinds of wastewater measurement, including industrial and municipal wastewater treatment plants.
High measurement accuracy: membrane-covered three-electrode design for long-term stable measurement with low drift.
Higher plant availability: Memosens technology combined with the Liquiline transmitter enables plug & play, fast sensor commissioning and replacement.
Non-contact inductive signal transmission for high process safety.
The sensor uses Memosens 2.0 digital technology and stores calibration and process parameters, making it the perfect basis for predictive maintenance and IIoT technology.
Spare Parts & Accessories 10
10 spare parts · click to collapse
| Order code | Description | |
|---|---|---|
| COV45- | COS41/COS51x maintenance kit COV45Maintenance parts for Memosens and fixed cable sensors COS51x and COS41. Include membrane caps, o-rings and further maintenance materials. | Enquire |
| 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 |
| 71495128 | Kit COSxx Standard Protective Cap | Details |
| 71495126 | COSxx 8.5 mm aperture cage-type dissolved oxygen sensor protective cap | Details |
| 71495130 | COSxx Dissolved Oxygen Sensor Protective Cap for Fish Farm Aquaculture Applications | Details |
| 71110801 | Cleaning head COS61/61D 6/8mm | Details |
| 71110802 | Cleaning head COS61/61D 1/4" | Details |
| 51518599 | COS31/41/51D/61/71 calibration capCalibration cap, COS31/41/61/71 | Details |
| 71072583 | *** cleaning unit, 230V air compressor | Details |
| 71194623 | Output Air Purification | Details |
Configurator / Comparison
A
Measurement principle video
Click to playSource: Endress+Hauserpublic information from the website
Manuals & Documents 4
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.
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