Suspended Solids Sensor ViSolid®

Optical infrared scattered light sensors are established for online measurement of this measuring parameter in treatment plants.

ViSolid® 700 IQ sensors, WTW presents a family of optical sensors for suspended solids measurement. These sensors incorporate a ultrasound cleaning system that guarantees low maintenance and long-term reliability of the sensors. Solid matter measurement with ViSolid® is performed according to the principle of scattered light measurement.

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•Non-mechanical ultrasound cleaning
•Low Maintenance
•Factory Calibrated
•Long-term stability (Sensor Check function)

Measuring Principle of Suspended Solids:
With increasing concentration of suspended solids, particles will interfere with each other. With this increasing number, not every particle is reached by the light source or the reflected light is not detected by the receiving device – thus incorrect values are measured. So the 90 degree scattered light method used for the turbidity measurement can only be used for lower concentrations.

For this reason WTW uses two methods of measurement – depending on the concentration. For lower concentrations, a scattered light method is used, in case of higher concentrations, the backscatter method is the better choice.


g/l SiO2 / % SiO2
0.01 to 300 g/l SiO2
0.001 to 30% SiO2

g/l TS / % TSS
0.003 to 1000 g/l TSS
0.0003 to 100% TSS

Ordering Information:
600 012 ViSolid® 700 IQ Digital suspended solids sensor for water/wastewater/sludge (ultrasonic cleaning) for use with the IQ SENSOR NET system. Please order connection cable SACIQ separately.

600 013 ViSolid® 700 IQ SW Digital suspended solids sensor for industrial and seawater applications (ultrasonic cleaning) for use with the IQ SENSOR NET system. Please order connection cable separately.



Weight 5 kg
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