With the VisoTurb® 700 IQ WTW presents a family of optical sensors for turbidity and suspended solids measurement. These sensors incorporate a ultrasound cleaning system that guarantees low maintenance and long-term reliability of the sensors. Turbidity measurements in aqueous media with VisoTurb® are carried out nephelometrically in compliance with EN ISO 7027. Solid matter measurement with ViSolid® is performed according to the principle of scattered light measurement.
• Non-mechanical ultrasound cleaning
• Low Maintenance
• Factory Calibrated
• Long-term stability (SensorCheck function)
Turbidity Measurement according to the Nephelometric Principle:
Using this principle, scattered light is measured at an angle of 90 degree. This method is ideal for low and medium range turbidity up to 4000 FNU. In compliance with EN 27027 and ISO 7027, infra red light with a wavelenght of 860 nm is used. This wavelength is outside of the visible range – thus potential coloration of the sample does not effect the measurements.
| Anti Fouling | UltraClean™ ultrasound cleaning system |
| Depth / Pressure Rating / Limit | 10 bar (145 psi) |
| Digital / Digital Sensors | Yes |
| Equipment used with | 2020 3G, 282/284 |
| Integrated Lightning Protection | Yes |
| Languages | German, English |
| Measurement Method / Channels | Nephelometric principle |
| Measurement Range | 0.0 to 4000 FNU, 0.0 to 4000 NTU, 0.0 to 4000 TEF, 0.0 to 4000 mg/l, 0.0 to 4000 ppm, 0.00 to 400 g/l |
| Medium | 0 °C … + 60 °C (32 … 140 °F) Operation with ultrasound cleaning system possible up to 40 °C |
| Operating pH Range | 4 to 12 units |
| Operating Temperature | UltraClean™ ultrasonic cleaning system: 32 – 104 °F (0 – 40 °C), 32 – 140 °F (0 – 60 °C) |
| Parameters Measured | Turbidity, TSS |
| Precision | Repeatability limit or repeatability according to DIN ISO 5725 or DIN 1319 respectively < .015 % or min. 0.006 FNU. |
| Response Time | 1 – 600 secs |
| Sampling | Yes |
| Smart Sensors / Ports | Yes |
| Storage Temperature | 23 to 149°F (-5 to 65°C) |
| Unit of Measure | ppm SiO2, mg/l SiO2, FNU, TEF, g/l TSS, NTU |
| User Replaceable | Yes |
| Waterproof | IP-68 |
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