Technical Data
CompareOxygen
| Measuring Principle | |
| Application | Process control in enzyme production, control of culture growth, biotechnology, food industry, general process applications |
| 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 Measurement possible in still water |
| Measuring range | 0.004 to 30 mg/l 0.05 to 330 %SAT 0.1 to 700 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 | Optical System, stainless steel |
| Material | Sensor shaft: stainless steel 1.4435 Process seal: FKM (USP , Class VI and FDA) Seal/O-rings: EPDM, FFKM (USP , Class VI and FDA) |
| Dimension | Diameter: 12 mm (0.47 inch) Shaft length: 120, 220, 360 and 420 mm (4.72, 8.66, 14.2 and 16.5 inch) |
| Process temperature | 0 to 140 °C (32 to 284 °F) |
| Process pressure | 0.02 to 13 bar abs (0 to 190 psi) |
| Temperature sensor | Pt1000 (Class A according to DIN IEC 60751) |
| Connection | Memosens-connection head |
| Certificates, declarations and approvals | Material certification 3.1 ASME BPE-2016 Regulation (EC) No. 1935/2004 |
The Memosens COS81D dissolved oxygen sensor is the ideal choice for hygienic applications, such as fermentation processes and inert protection against oxidation. The long-term stable, highly accurate measurement and the integrated continuous self-monitoring of the COS81D sensor guarantee the most reliable measured values, helping users achieve compliant product quality and optimize yield. Thanks to Memosens digital technology, the COS81D not only offers the highest process performance and data integrity, but is also simple to operate. It can be calibrated in the laboratory for predictive maintenance.
Benefits
Hygienic design in accordance with EHEDG and ASME BPE (including USP Cl. VI and FDA compliance) avoids cross-contamination and meets GMP and GLP requirements.
The sensor can be installed in the process and used in fermenters. Measurement results are completely consistent from the initial laboratory scale-up to the final enlarged process and the in-process laboratory.
The sensor can be replaced in just seconds for maximum process uptime: pre-calibrate the sensor in the laboratory, replace the existing sensor directly, plug & play. No polarization time required; measurement can begin immediately.
A built-in reference LED compensates for aging of the measuring LED, ensuring reliable measured values throughout the entire production batch.
Reduced maintenance: the Memosens COS81D contains no complex electrolyte or sensitive membrane. Simply replace the sensor cap and perform calibration.
Important sensor parameters and process data are stored in the Memosens COS81D sensor head. Throughout the sensor service life, the Memobase Plus CYZ71D sensor management software archives all stored parameters, providing fully traceable records and minimizing paperwork.
Suitable for CIP/SIP cleaning and autoclaving, with hazardous area approval.
Applications
The Memosens COS81D measures in demanding applications and aseptic hygienic applications, such as:
Fermentation processes
Inert protection against oxidation
Drinking water production
The Memosens COS81D dissolved oxygen sensor has international explosion-protection approvals, e.g. ATEX and IECEx, and can be used in hazardous areas.
Pharmaceutical certificates matching the sensor serial number are provided.
Spare Parts & Accessories 3
3 spare parts · click to collapse
| Order code | Description | |
|---|---|---|
| 50001041 | DO/Chlorine Sensor Zero-Point Calibration PowderChemical producing water free of oxygen or chlorine for test purposes. | 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 |
| COV81- | COV81 Maintenance Kitservice kit for Memosens COS81D contains optical cap, o-rings and further material for maintenance of COS81D and COS81E | Enquire |
Configurator / Comparison
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Source: Endress+Hauserpublic information from the website
Measuring principle video
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All documents for this modelProduct Videos
Case 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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