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Dissolved oxygen assembly
Cleanfit COA451

Dissolved oxygen assembly
Cleanfit COA451 ©Endress+Hauser

Retractable assembly for water, wastewater and utilities

Cleanfit COA451 is a retractable assembly for all fields of dissolved oxygen measurements. It is equipped with a stop bolt, O-ring seals and a ball valve, enabling complete isolation of process and sensor compartment. This allows you to access the sensor without interrupting the process or emptying the pipe or tank. Better still, benefit from increased process and operational safety and significantly reduced maintenance effort across the whole measuring point.

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  • Benefits

    • One assembly for all applications: The 'one for all' principle optimizes stockholding, speeds up project handling and simplifies life cycle management.

    • Easy and safe maintenance: Sensor service and cleaning without process interruption.

    • Robust design:...

  • Field of application

    Cleanfit COA451 is a retractable assembly for oxygen sensors with a diameter of 40mm in:

    • Wastewater treatment plants:
      - O2 control in the aeration basin
      - Process water treatment and monitoring

    • Water works:
      - Status monitoring of drinking water
      - Water...

Features and specifications



  • Measuring principle

    Sensor Oxygen

  • Application

    Process measurement
    Water and wastewater treatment
    Drinking water
    Monitoring of surface water
    Fish farming

  • Characteristic

    Sensor monitoring and cleaning without process interrupt.

  • Design

    Process holder with manual ball valve and rinse water connection.

  • Material

    Holder : stainless steel 1.4404 (AISI 316L)
    Air relief valve and rinse connection : nickeled brass
    Sealing : Viton

  • Dimension

    Immersion depth : 170mm or 270mm
    (6.63 - 10.53inch)

  • Process temperature

    max. 80°C (176°F)

  • Process pressure

    For manual assembly operation : max 2bar (29psi)
    Medium pressure : max. 10bar (145psi)

Documents / Manuals / Software

Accessories / Spare parts

Order code
  • 22
  • 14
  • 5
    • Order code 51513164

      Kit COA/CUA451:Sensor holder CUS41Long

      For Sensors CUS41, CUS51D, COS31, COS61, COS61D

    • Order code 51513166

      Kit COA/CUA451:Sensor holderCUS65short

      For Sensors CUS65, COS41, COS51D

  • 11,12,13,2
  • 3,4,11,20
  • 1,2,11,12,
  • 1,2,3,4,11
  • 1,2
  • 2
  • 6,7,9,11,1
    • Nr 6,7,9,11,1 Order code 51513169

      Kit CxA451: Set of small components

      includes 5 bracket, 10 Securing screws 2 Bayonet lock, 15 Grub screw 1 Greace nipple

  • 10
  • 8,16,17,18
  • 8,16,17
    • Order code 71448684

      Kit CxA451 Welding adapter R2" 1.4404

    • Order code 50080249

      welded fitting 1.4571 DN50/ANSI

      For retractable holder COA 461/CUA 461/ CPA451 / CUA451 / COA451. connection DN50 and ANSI 2". (Gasket to be provided by customer)

    • Order code 51500912

      Welding socket for spray cleaning VA

      for automatic spray cleaning of sensors CUS 31/41, CPF81/82 in tubes or tanks welding socket DN 65 with removeable spray jet and flange DN 50 / ANSI 2" for connection of CUA 461 / CUA 120-B / CPA451 / CUA451 / COA451 Material: SS / Viton Connection spray tube: Thread R 1/4" Pressure / temperature: 6 bar / 80oC