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Suspended solids sensor
Turbimax CUS51D

Turbimax CUS51D is a smart suspended solids sensor for unattended operation in water and wastewater. ©Endress+Hauser
Turbimax CUS51D measures suspended solids and turbidity. ©Endress+Hauser

Turbidity is the cloudiness of a liquid caused by suspended particles. This video shows how turbidity measuring principles work.

Memosens sensor for suspended solids and turbidity measurement in water, wastewater and utilities

Turbimax CUS51D is a smart sensor that allows unattended operation in a wide range of process conditions. Its unique design is extremely robust and it is also low-maintenance thanks to its self-cleaning functionality. Choose from different integrated analytical models to adapt the sensor to your specific application. With Memosens digital technology, the CUS51D combines maximum process and data integrity with simple operation. It resists corrosion and moisture and enables lab calibration.

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  • Benefits

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

    • Optimum adaption to all measuring tasks:
      Sensor fits all measuring ranges thanks to numerous integrated...

  • Field of application

    Turbimax CUS51D measures suspended solids and turbidity in:

    • Wastewater treatment plants:
      - Solids content measurement in aeration, recirculation and sludge treatment
      - Flocculent dosing
      - Turbidity measurement in the outlet

    • Drinking and process water...

Features and specifications



  • Measuring principle

    Four beam alternating light

  • Application

    All drinking and process water applications
    Turbidity measurement at all stages of the water treatment process, in inlet/outlet of waterworks, filter monitoring and filter backwashing, drinking water networks

  • Installation

    Insitu (immersion in process or retractable holder), extractive with sample and flow cell

  • Measurement range

    For formazin: 0 to 4000 FNU

    Display range up to 9999 FNU

    For sludge: 0 to 300 g/L

    The achievable measuring range depends very much on the media

  • Measuring principle

    Scattered light in 90°/135° and 4beam cross light

  • Design

    40 mm sensor, stainless steel

  • Material

    Stainless steel 316L

  • Dimension

    194 mm x 40 mm

  • Process temperature

    Process temperature:
    -5 to 50 °C (23 to 122 °F)

    Ambient temperature:
    -20 to 60 °C (-4 to 140 °F)

  • Connection

    G1, NPT3/4"

  • Ingres protection

    IP68 (1 m / 3.3 ft) water column with 1N KCl during 60 days

Documents / Manuals / Software

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