An automatic water quality detector is a device that conducts regular or irregular testing of chemical substances, suspended solids, sediments, and aquatic ecosystems in water to determine the types, concentrations, and trends of pollutants in the water and evaluate water quality. Suitable for automatic sampling of water samples from industrial pollution sources, rivers, lakes and seas by environmental monitoring stations at all levels, sewage treatment plants, water conservancy, water affairs, scientific research institutes, etc. The following is the application of Lingheng's multifunctional and multi parameter online water quality monitoring in the detection of river water quality in residential areas.