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Turbidity assembly
Cleanfit CUA451

Turbidity assembly
Cleanfit CUA451 ©Endress+Hauser

Retractable assembly for water, wastewater and utilities

Cleanfit CUA451 is a retractable assembly for all fields of turbidity and suspended solids measurements. It is equipped with a stop bolt, O-ring seals and a ball valve, enabling complete separation 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

    The Cleanfit CUA451 is a retractable turbidity assembly for:

    • Wastewater treatment plants:
      - Sludge in the recirculation line
      - Sludge centrifuge monitoring
      - Primary sludge and sludge treatment

    • Drinking and process water:
      - Sludge treatment in water...

Features and specifications



  • Measuring principle

    Single beam scattered light

  • Application

    - Primary sludge and return activated sludge in sewage treatment plants.- Sludge centrifuge monitoring- Filter monitoring and filter backwash- Monitoring of phase break processes.- Cooling water monitoring.

  • Installation

    Manual retractable holder with ball valve for pipe or bypass installations.

  • Characteristic

    - Cleaning possible in every operation mode due to rinse water connection.- Sensor monitoring and calibration without process interrupt.

  • Design

    Manual retractable holder with rinse water connections and external cleaning system. Rinse water connection can be used as sealing water inlet.

  • Material

    Holder : stainless steel 1.4404Sealing : Viton

  • Dimension

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

  • Process temperature

    0 to 85 °C (32 to 185 °F)

  • Process pressure

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

  • Connection

    Process connections : Flange DN50/PN16; ASME 2"/150lbs; G2";Rinse water connections: 2x G1/8; Air supply: 9mm tubing.

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

    • Order code 71254975

      Kit CUA451: Sensor holder CUS52D short

  • 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

  • Predecessor

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