Azbil Temperature Controller SDC25 : The SDC25 Single Loop Controller is a digital indicating controller featuring multi-range inputs and a PID control system using the new “RationaLOOP PID” (Ra-PID) and “Just-FiTTER’ algorithms. Up to 2 contro! outputs are available (depending on the model), selectable from relay contact, voltage pulse, and current. Compatible with the Smart Loader Package, which facilitates setup and monitoring.