KNF105L residual chlorine sensor adopts the measurement principle of membrane method. It is used in drinking water treatment plant, canning plant, drinking water distribution network, swimming pool, cooling circulating water, water quality treatment engineering and other occasions where the residual chlorine content in aqueous solution needs to be continuously monitored, with automatic temperature compensation. Output standard Rs485 (Modbus/RTU protocol) digital signal, can be connected to PLC, DCS, industrial control computer, paperless recording instrument or touch screen and other third party equipment.