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IQ sensors turbidity sensors

WTW sensors IQ turbidity sensors VisoTurb®
WTW sensors IQ turbidity sensors VisoTurb® 700 IQ
WTW sensors IQ turbidity sensors VisoTurb® IQ SW

VisoTurb®: Optical turbidity sensors according to nephelometric principle according to DIN EN 27027 and ISO 7027 for the in-situ use in water/wastewater with ultrasonic cleaning system

  • Ultrasonic cleaning without mechanics
  • Extremely low-maintenance
  • Highly accurate factory calibration
  • High operational safety (sensor check function)

The ultrasonic cleaning system ensures the low-maintenance and continuously reliable measuring operation of the sensors, which are therefore very suited for extreme applications, such as wastewater treatment plants.

With the nephelometric measuring principle of the VisoTurb®, the stray light is measured at a 90° angle. The measuring setup is suitable for low and medium turbidity values up to 4000 FNU. According to DIN EN 27027 and ISO 7027, infrared light is used in the wavelength range of 860 nm. This wave length is outside the visible range, so that possible sample colorings generally do not cause any interference.

The sea water model includes the sensor for use in special media: All wetted parts are made of titanium and plastic and are therefore extremely resistant to corrosion.


Model Description Order no.
VisoTurb® 700 IQ Digital turbidity sensor with integrated ultrasonic cleaning (please order cable separately) 600010
VisoTurb® 700 IQ SW Like VisoTurb® 700 IQ, but as a sea water model 600011

Technical Data

Measuring range 0.05 … 4000 FNU
0.1 ... 4000 mg/l SiO2
0.0001 ... 400 g/l TS
Measuring procedure Nephelometric procedure according to DIN EN 27027 and ISO 7027
Procedure coefficient according to DIN 38402 Teil 51 < 1 % in the range up to 2000 FNU
Cleaning procedure Ultrasonic cleaning
Ambient conditions Operating temperature: 0 … +60 °C
Pressure resistance of sensor 10 bar


Model Description Order no.
Standard 1000 FNU Test standard with 1000 FNU for VisoTurb® 700 IQ 600014


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