Libratherm offers Microcontroller based multiple Ramp Soak programmable PID temperature controllerModel PRC-489 which is designed to improve reliability, accuracy and control for all temperature controlapplications. It features Ramp and Soak functions (the capability to control the temperature and its rate ofchange over a predetermined time span). Single pattern of total 16 (rampsoak) steps can be programmedand stored in the memory. It can also be used as single set point control when the rampsoak profile control isnot desired. Inputs can be Thermocouple, IR Thermocouple, RTD Temperature Sensors, Voltage, CurrentSignals etc.PRC-489 offers both switching outputs in the form of SSR driverTriac (AC SSR) for external SSR or externalload contactor and analog output in the form of (4-20) mA or (0-5) volt control signal, which can be used tocontrol heater power through Thyristor power regulator (for electrical heating system) or to control theposition of a modulating motor valve (for oil or gas fired heating systems). The analog outputs can be directlyconnected to Libratherm make single phase three phase SCR phase angle or zero cross over fired powercontroller which is ideally suitable for both resistive and inductive heating loads.