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Digital oxygen sensor
Oxymax COS22D

Digital oxygen sensor
Oxymax COS22D ©Endress+Hauser
Digital oxygen sensor
Oxymax COS22D ©Endress+Hauser

The concentration of oxygen dissolved in a liquid can be measured using the amperometric or optical measuring principles. This video shows what it is about and how these measuring principles work.

Memosens converts the measured value to a digital signal and transfers it to the transmitter without a contacting connection. This video shows how Memosens optimizes process control and maintenance.

Memosens amperometric oxygen sensor for standard, hygienic and sterile applications

The Oxymax COS22D safeguards your products, process and plant equipment from oxygen influences. It measures reliably over a wide range helping you to better monitor and control your applications. The sensor is low-maintenance and ensures long-term stability - even with frequent sterilization and autoclaving. Thanks to Memosens digital technology, COS22D combines maximum process and data integrity with simple operation. It enables lab calibration and facilitates predictive maintenance.

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  • Benefits

    • Reliable, long-term stability and linear measurement

    • Low-maintenance design

    • Suitable for CIP/SIP and autoclaving

    • Unique hygienic design (EHEDG)

    • USP class VI

    • Approved for hazardous area use

  • Field of application

    Oxymax COS22D measures oxygen in the core processes of many industries:

    • Pharma and biotechnology
      – Process control in enzyme production
      – Control of culture growth

    • Food & Beverages

    • Chemicals

    • Water treatment
      – Boiler feedwater
      – WFI (water for...

Features and specifications



  • Measuring principle

    Sensor Oxygen

  • Application

    Beverage, pharmaceutics, biotechnology, water treatment, process, chemical, inertization

  • Installation

    Standard process connection Pg 13.5
    Installation in standard pH assemblies possible

  • Characteristic

    Digital or analog sensor for long-term stable oxygen measurement for frequent sterilization and autoclaving
    CO2 compatible trace sensor for the beverage industry
    Trace sensor in the power plant sector

  • Measurement range

    0.001 to 20 mg/l
    0 to 200 %SAT
    0 to 400 hPa

  • Measuring principle

    Amperometric measurement of oxygen

  • Design

    Membrane-covered 2-electrode oxygen sensor with teflon-membrane, stainless steel sensor

  • Material

    Sensor body: stainless steel 1.4435
    Membrane: PTFE coated stainless steel net with a silicone coating

  • Dimension

    Diameter: 12 mm (0.47 inch)
    Shaft length: 120, 225, 360 and 420 mm
    (4.72, 8.86, 14.2 and 16.5 inch)

  • Process temperature

    -5 to 135 °C (23 to 275 °F)

  • Process pressure

    1 to 12 bar abs (14.5 to 174 psi)

  • Temperature sensor

    Integrated NTC temperature sensor

  • Connection

    Memosens-connection head

  • Additional certifications

    Material certification 3.1
    EHEDG Type EL Class I

Documents / Manuals / Software

Accessories / Spare parts

Order code
    • Order code 51500832

      Junction box RM

      to lengthen the cable for Memosens/CUS31/41. Protection class IP 65, with 2x PG 13.5

    • Order code COS22Z-

      Maintenance Kit Oxymax H COS22Z

      Service Kit, COS22 und COS22D

    • Order code CYK11-

      Measuring cable CYK11 Memosens

      Extension cable, Application: digital fixed cable sensors respectively CYK10. Operating temperature range: -30...90oC

    • Order code COY8-

      Zero-point gel COY8

      Zero 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