Technical Data
CompareOxygen
| Measuring Principle | Optical oxygen measurement |
| Application | • Oxygen control in fermenters, e.g. in the pharmaceutical or biotechnology sectors • Monitoring of explosive atmospheres with an oxygen concentration of ≥ 2% Vol • Quality control in the food industry |
| Installation | Standard process connection Pg 13.5 Installation in standard pH assemblies possible |
| Characteristic | Hygienic, optical sensor for stable oxygen measurement over multiple sterilization cycles |
| Measuring range | 0.004 to 30 mg/l 0.05 to 330 %SAT 0.1 to 700 hPa |
| Measuring principle | Principle of luminescence quenching |
| Design | Optical system, stainless steel |
| Material | Sensor shaft: Stainless steel 1.4435 (AISI 316L) Process seal: FKM (USP, Class VI and FDA) Process seal for Ex versions: FKM (not FDA-compliant) Seals/O-rings: EPDM, FFKM (USP, Class VI and FDA) Spot cap: Stainless steel 1.4435 (AISI 316L), titanium or hastelloy Spot layer: Silicone (USP, Class VI and FDA) |
| Dimension | Diameter: 12 mm (0.47 inch) Shaft length: 120, 160, 220, 320 and 420 mm (4.7 , 6.3 , 8.7 , 12.6 and 16.5 inch) |
| Process temperature | 0 to 60/80 °C (C-shape/U-shape) 32 to 140/175 °F (C-shape/U-shape) Sterilization: max. 140 °C at 6 bar for max. 45 min (Max. 284 °F at 87 psi for max. 45 min) |
| Process pressure | 0.02 to 13 bar abs (0 to 190 psi) |
| Temperature sensor | Pt1000 |
| Ex certification | With ATEX, IECEx, NEPSI, Japan and INMETRO approvals for use in hazardous areas Zone 0, Zone 1 and Zone 2 and furthermore Zone 20, Zone 21 and Zone 22 in dust hazardous areas. With CSA C/US approval for use in hazardous areas Class I Division 1 and furthermore Class II Division 1 in dust hazardous areas. |
| Connection | Inductive, digital connection head with Memosens 2.0 technology |
| Ingress protection | IP68 IP69 |
| Certificates, declarations and approvals | Inspection certificate 3.1, EN10204 Surface roughness test ISO4287/Ra (≤ 0,38 µm) Conformity to cGMP derived requirements ASME BPE US Food Contact Materials FDA CFR 21 EU Food Contact Materials (EG) 1935/2004 CN Food Contact Materials GB 4806 EHEDG EL Class I |
The Memosens COS81E digital optical dissolved oxygen sensor is the ideal choice for hygienic applications. The sensor effectively prevents light source aging, delivers stable, high-precision measured values and ensures high product quality. The COS81E is explosion-proof approved and can measure in dust explosion hazardous areas, making it particularly suitable for inert-gas blanketing anti-oxidation processes. Using Memosens 2.0 digital technology, the COS81E supports extended data storage and is the perfect basis for preventive maintenance and efficient measurement.
Advantages
The Memosens COS81E is designed in accordance with EHEDG and ASME BPE. It eliminates the risk of cross-contamination and fully complies with USP Cl. VI, FDA approval, GMP and GLP requirements.
Long uptime: the sensor can be precalibrated in the laboratory, is plug-and-play and can be replaced quickly online. No polarization time required, ready for use immediately after installation.
Reliable measuring results: a built-in reference LED compensates for aging of the measuring LED. Measured values remain accurate even after CIP/SIP and autoclaving.
Low maintenance: the electrolyte or sensitive sensor membrane of the Memosens COS81E is very easy to replace. Simply replace the sensor cap and then calibrate the sensor.
The sensor can be installed in process and fermenter applications. Results remain stable and consistent from initial laboratory trials through to batch production and laboratory applications.
The sensor is explosion-proof approved and can measure in dust explosion hazardous areas, making it particularly suitable for inert-gas blanketing anti-oxidation processes.
Supports IIoT: Memosens 2.0 supports extended data storage, saving calibration and process parameters for better trend identification, and is the perfect basis for preventive maintenance and advancing IIoT technology
Application areas
The Memosens COS81E can measure in applications with strict sterile and hygienic requirements, such as:
Fermentation processes
Drinking water production
Inert-gas blanketing anti-oxidation processes
The Memosens COS81E dissolved oxygen sensor has international explosion protection approvals, e.g. ATEX and IECEx, and can be used in hazardous areas
Spare Parts & Accessories 2
2 spare parts · click to collapse
| Order code | Description | |
|---|---|---|
| COV81- | COV81 Maintenance Kitservice kit for Memosens COS81D contains optical cap, o-rings and further material for maintenance of COS81D and COS81E | 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 |
Configurator / Comparison
Accessories / Spare parts
Source:Endress+Hauserpublic information from the website
Measuring principle video
Click to playCase 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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