Turbidity is the optical property of the water that causes light to be scattered by suspended particles. High particle concentration causes high turbidity. By establishing the relationship between turbidity and the local suspended matter this measurement can be used for assessing the concentration of suspended matter.
The Turbidity Sensor 4296 measures the backscatter of infrared light. A high efficiency light emitting diode is used to transmit modulated light into the water. The backscattered light is picked up by a sensitive photodiode and this signal is then conditioned, linearized and converted to data in engineering unit (FTU). In addition to turbidity, the sensor also measures water temperature.