This ion concentration controller is perfect for in-line batch processing, control processing, or water treatment. Connect an ion-selective electrode to the controller to monitor the concentration of ions. Microprocessor-based controller continuously displays current ion reading with relay status. Relays are triggered when current concentration reaches high or low setpoints. Connect warning lights or buzzers to relays to signal alarm conditions. To use as an automatic processing system, connect pumps or valves directly to relays. Connect to a printer, datalogger, or computer to analog output (0 to 20 or 4 to 20 mA) for a continuous record of readings and alarm conditions.