The Global Water’s pH Controller is a 1/4 DIN panel mount controller with dual SPDT Hi/Lo relays, manual set points and calibration potentiometers set into the front of the panel. The pH controller features an isolated 4-20 mA current output and an external pH/ORP select switch. The pH Controller’s display is a large 0.5” LCD screen. Sensor connectors are a BNC input and spade lug screw type connector block. The pH Controller requires a Pt100 ATC probe or a simulation resistor for temperature. The pH Controllers are precise instruments for the measurement and control of pH and mV (ORP). Two output relays are provided on the pH Controllers for ON/OFF control. The isolated 4-20 mA current output covers the input control range of 0 to 14 pH and 0 to 1400 mV. The pH Controllers DIN housing allows the controllers to fit into standard panel cutouts, while providing industrial weatherproof and environmental housings.Â