Turbidity Monitoring
WTW Sensors for turbidity and suspended solids measurement
VisoTurb® and ViSolid®
On-line Turbidity and Suspended Solids Measurement using revolutionary technology:
Continuous turbidity and suspended solids measurement are of great importance in analytic measurement in modern wastewater treatment plants. Optical infrared scattered light sensors are established for online measurement of this measuring parameter in treatment plants.
The VisoTurb® 700 IQ and ViSolid® 700 IQ sensors, are quality 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.
Turbidity Sensor VisoTurb®
Features and Benefits
- Non-mechanical ultrasound cleaning
- Guaranteed low Maintenance
- Long-term sensor reliability
- Factory Calibrated
- Long-term stability (SensorCheck function)
- Compliance with EN ISO 7027
Technical information
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 wavelength of 860 nm is used. This wavelength is outside of the visible range – thus potential coloration of the sample does not effect the measurements.
Suspended Solids Sensor ViSolid®
Features and Benefits
- Non-mechanical ultrasound cleaning
- Low Maintenance
- Factory Calibrated
- Long-term stability (SensorCheck function)
Technical information:
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.
B & C Electronics UT7685 Analyzer (Controller)
The TU7685 Analyzer (Controller) together with the TU810/8105 (In-Line) and TU8182 (Dip) Sensors offer the User flexibility in Turbidity Monitoring.
These online monitoring systems are designed for the continuous measurement of Turbidity in water.
The full operating range of the system may be selected by the User from 0-4.000 to 0-4000 NTU or from 0-9.999 to 0-999 mg/l of SiO2, and the sensing system will operate on water streams with temperature from 0 to 50 degrees C.
The measured Turbidity is displayed on a backlit liquid crystal display on the front of the instrument. The Turbidity monitor is well suited for wastewater treatment, effluent monitoring, or stream monitoring.
The mesuring method is Nephelometric.
A light source and a photocell are positioned with their axes 90 degrees from each other. The emitted light is scattered by particles in the process and received by the photocell, in accordance to standard ISO7027.
The Autoclean option delivers high pressure air to the tip of the sensor (TU-8182) to effectively blast accumulated growth from the optical lens. Once installed and placed into operation, the Autoclean Turbidity Sensor will provide months of reliable Turbidity measurement in almost any application. Sensor cleaning frequency is programmable and units are shipped with a default cleaning frequency of once every 24 hours.
Applications
- Monitoring of streams and rivers.
- Monitoring of water storage bodies including stratification studies.
- Intermediate and final effluent treatment monitoring.
- Hydrological run off studies.
- Ground and bore water analysis.
- Drinking water filtration efficiency.
- Industrial process monitoring.
- Sludge and dredge monitoring.