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Turbidity is a decrease of water transparency due to the presence of suspended solid, t consist of very fine particles, unable to settle in a reasonably short time. The particles in suspension determine an absorption of light radiation according to the number and size of the particles themselves.


  • Sludges from biological processes
  • Chemical industry
  • Paper mills
  • Food production
  • Extraction Systems
    - Quarries
    - Tunnels
    - Aggregate extraction
  • Standard version

  • SS316 body with Modbus RTU RS485 interface
  • On request

  • PVC body
    4…20 mA outputs
  • 2 models available

  • S461 S for immersion
  • S461 S INS for insertion (in combination with S305-INS)
  • S461 S Technical specifications

    Measuring range 0...30 g/l MLSS of WWTP - on request 0...100 g/l Kaolin reference
    Measuring method Absorption of light
    Resolution 0.1 g/l
    Accuracy ± 0.3 g/l
    Repeatability ± 0.5 g/l
    Response time T90 < 60s
    Operating temperature 0…50 °C
    Maximum pressure 4 bar
    Body material SS316 (on request only Black PVC)
    O-Rings Viton®
    Optics Special Epoxy
    Mechanical protection IP68 Sensor + cable
    Power supply 12…24Vdc
    Power consumption max. 3W
    Cable 10m integral with the sensor
    Calibration by points
    Signal interface Modbus RTU Standard Protocol RS485
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