The universal 8611 controller is especially designed for compact control system applications. It can be connected with every non-Bürkert Control valve by standard signal (4-20 mA, 0-10 V or PWM-output). The proportional & Integral (PI) process controller is equipped with many additional functions. The process value feedback can be supplied as one of three analog inputs; a standard signal (4-20 mA/0-10V)), frequency or RTD signal; directly to the universal controller. The process switching points can be set via a 4-20 mA or 0-10 V signal or with the keypad. Thanks to the proportional control capabilities, a wide range of control functions can be performed in a variety of liquids and gas medias.