RT18 is a programmable temperature ON/OFF controller with fixed input for various temperature sensors and linear signals. It is equipped with 3-digit LED display and relay control output. For easy mounting in existing cutouts, RT18 is available with 48x48, 96x48, 48x96, and 96x96 mm front sizes. To control its output, the device may utilize either ON/OFF or PI auto-tune control algorithm, the latter being a convenient solution that saves installation time and costs and provides precise control. The reliable operation in noisy industrial environment also extends RT18 application area.