LoRaWAN solar water quality nitrite ion sensor is a wireless water quality monitoring device designed specifically for outdoor scenarios. It is powered by solar energy and has a large capacity lithium battery built-in, which can work for a long time without the need for an external power source. The sensor is based on PVC membrane ion selective electrode, which can accurately measure the concentration of nitrite ions in water (range 0-2 mg/L), and has automatic temperature compensation function. Through LoRaWAN wireless communication (supporting OTAA Class A/C), data can be remotely reported to the platform. The product is widely used for online continuous analysis and process control in industrial wastewater, surface water, drinking water and other fields.