The RS485 water quality sodium ion sensor adopts the ion selective electrode method to monitor the concentration of sodium ions in water in real time. It has RS485+Modbus RTU output and is suitable for industrial networking. IP68 protection, wide temperature operation, automatic temperature compensation, strong anti-interference, low power consumption, long-term stability. No need for reagents or in-situ measurement, suitable for scenarios such as drinking water, aquaculture, industrial circulating water, boiler water, etc., to assist in water quality safety and process control.