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Turbidity refers to the scattered component of a light beam which is diverted away from its natural course e by optically denser particles in the medium (e.g. solid matter particles).

The measurement is performed by using a 90° scattered light method compliant with ISO 7027 / EN 27027. The measuring method is based on the Tyndall effect. The turbidity of the medium is determined by the amount of scattered light.


  • Drinking water
  • Process industrial water
  • Low turbidity waters
  • Immersion or by-pass installation
  • Standard version

  • PVC Body and Modbus RTU RS485 interface
  • On request

  • SS316 body
    4…20 mA outputs
  • S461 LT Technical specifications

    Measuring range 0…10 NTU / 0…100 NTU
    Measuring method 90° Scattered light
    Resolution 0,01 NTUfor 0…10 NTU range
    0,1 NTUfor 0…100 NTU range
    Accuracy ±1%for 0…10 NTU range
    ±5%for 0…100 NTU range
    Repeatability ±0.05 NTUfor 0…100 NTU range
    ±0.5 NTUfor 0…100 NTU range
    Response time T90 < 60s
    Operating temperature 0…50 °C (0…75 °C with SS316 optional body)
    Maximum pressure 4 bar
    Body material Black PVC (on request only SS316)
    O-Rings Viton® and Silicon
    Optics Special Glass with oleophobic treatment
    Mechanical protection IP68 Sensor + cable
    Power supply 12…24Vdc
    Power consumption max. 3W
    Cable 10m integral with the sensor
    Calibration 1-point and/or 2-point for scale
    Signal interface Modbus RTU Standard Protocol RS485
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