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The soil contains mud, silt, fine organic matter and other microorganisms and colloids to give turbidity in the water. The turbidity sensor is a sensor that detects the turbidity value of a water by using the degree of hindrance that occurs when suspended matter in the water passes through the light.After the infrared light wave transmitted by the transmitter on the sensor is absorbed, reflected and scattered by the measured object during transmission, a part of the transmitted light can be irradiated to the detector in the 180° direction, and the intensity of the light received on the detector is measured and measured. The turbidity of sewage has a certain relationship, so the turbidity of sewage can be calculated by measuring the intensity of transmitted light. It is widely used in the monitoring of turbidity values in chemical, electroplating, paper making, environmental water treatment engineering, pharmaceutical, food, tap water and other solutions. Especially suitable for use in the field and on the spot.