The W640 pH/ORP on-line process controller is designed for a broad range of industrial, commercial, and municipal water treatment applications. The W640 Walchem controller is easily configured to accurately measure pH or mV (ORP) values from Walchem’s WEL and WDS differential combination electrodes, or any conventional combination electrode.
A versatile output configuration allows you to program up to six outputs in a variety of control modes. Select from on/off mechanical relays or pulse proportional control for direct connection to metering pumps. The easy-to-use menu and pre-wired, pre-mounted panel system options make set-up and installation quick and simple.