Our pH /ORP controller has been designed for easy, affordable installation in tight spaces to perform simple yet effective process control. Thanks to its compact size,the PO-650 controller can be installed on field or Panel.This versatile controller is ideal for a wide variety of applications, such as textiles, papers, photographic solutions, plating baths, chemicals and water treatment. The PO 650-pH is provided with a selectable set point for acid or alkali dosage. Measurements are directly taken from a pH electrode in the range from 0 to 14 with a 0.01 pH resolution. Accuracy is ensured by two point calibration. The PO 650-ORP is ideally suitable for online prediction of presence of free chlorine in RO feed waters, swimming pools, drinking water as well as process water. In addition, this model features an optional 4-20 mA analog/RS 485 output.