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Turbimax CUS31

The Turbimax CUS31 turbidity sensor measures according to the 90° scattered light method. ©Endress+Hauser

This product is no longer available.

Please check new generation in the section predecessor / successor or contact your local Endress+Hauser entity.

Features and specifications



  • Measuring principle

    Single beam scattered light

  • Application

    Drinking water, industrial water

  • Installation

    In immersion assembly, pipe installation or in a flow through holder with or without bubble trap.

  • Characteristic

    optical sensor for turbidity measurement according DIN ISO 7027.Precalibrated in a flow through holder with or without bubble trap.

  • Measurement range

    0,000 - 9999FNU0,00 - 3000 ppm0,0 - 3,0 g/L0,0 - 200,0%

  • Measuring principle

    Optical sensor according 90° scattered light in the near infrared light (880nm) according DIN EN ISO 7027

  • Design

    Infrared diodes with two receiver for low and high range values as well as a reference diode. Chamfered measuring head to optimize the self cleaning and optional with wipper cleaning to replace microbubbles from the optical windows.

  • Material

    Sensor shaft : PVC / PPS GF40Optical window : saphireCable : TPEO

  • Dimension

    Diameter : 40mm
    1.56 inchLength : 191mm
    7.44 inch

  • Process temperature

    max. 50°C

  • Process pressure

    max. 6bar

  • Temperature sensor

    Integrated NTC temperature sensor

  • Connection

    Fixed cable connection

  • Ingres protection


  • Additional certifications

    Calibration certification

Documents / Manuals / Software

Accessories / Spare parts

Order code
    • Order code 50013733

      O-RING ID 59.92 W 3.53 AD 66.98 VITON

      Alte Material-Nummer: 115630

    • Order code 50051753

      o-ring f.CLS21 ID28.17 W3.53

    • Order code 50057944

      Calibration vessel for CUS31 and CUS41

      With device for sensor positioning Material: PVC, black.

    • Order code 50072656

      Spare parts kit CUY 2

      for connection of turbidity flow assemblies to tubes (i.e. CUD3/CUS31 or CUA250).

    • Order code 50089252

      Kit CUY31 Wiper Blade

      3 replacement wipers for CUS 31/CUS 41 Material: SS/NBS/NBR/PVC

    • Order code 51500733

      Flow assembly "S" for CUS31/CUS52D

      additional item Adapter for S-assembly (51503244) is required

    • Order code 51500735

      Flow assembly "E" for CUS31

      for upgrage of sensorversion CUS31-xxA and for CUS41, CUS51D, CUS52D additional item Adapter for S-assembly (51503244) is required

    • 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 51502543

      Measuring cable CYK81

      To lengthen the fixed cable of CUS sensors e.g. CUS31/CUS41/Memosens. 2x2 wires, twisted pair with shield and TPE-O-sheath (2x2x0,5 qmm + sheath). Minimum length 10 m (price per meter).

    • Order code 51503473

      O-ring ID 40.00 W 3.00 AD 46.00 EPDM

    • Order code 51504477

      CUY 22 check unit for CUS 31 / 41

      to check sensorfunction and sensorstability.

    • Order code 51511635

      Pipe clamp DN100 for S/E-assembly

    • Order code 71023415

      Kit CUS31/52D: Flow-headpart S-assembly

    • Order code 71371596

      Kit 31 with wiper 15 m cable

    • Order code 71371599

      Kit 31 without wiper 15 m cable

    • Order code 71390541

      Kit CUS31/41: Adapter for S/E assembly

  • Successor