Walchem’s WDP400 Series Dual Input pH/ORP controllers are designed for a broad range of industrial, commercial, and municipal water treatment applications. WDP controllers accept two electrode signals, in any combination of pH and ORP, and are offered in a convenient pre-wired NEMA 4X wall mount package that can be installed in minutes. The dual input model reduces space requirements and is more cost effective than two single input models. Integrated data logging is available to validate system performance. A USB stick is all that’s needed to extract data and event logs that include electrode measurements, temperature, accumulated chemical feed and relay activation times.