Libratherm offers Microprocessor based multiple Ramp / Soak programmable PID temperature controller Models PRC-300, PRC-309, and PRC-310, which are designed to improve reliability, accuracy and control for all processing applications. It features Ramp and Soak functions (the capability to control the temperature and its rate of change over a predetermined time span). One to ten different patterns each of sixteen ramp/soak steps can be programmed into the memory with the user-friendly membrane keyboard. Separate displays are provided to monitor simultaneously the Process temperature, Set temperature and the Program number. It can also be used as single set point control when the profile control is not desired. Inputs can be Thermocouple, IR Thermocouple, RTD Temperature Sensors, Voltage, Current Signals and etc.

It offers both switching outputs in the form of SSR or relay to drive external load contactor and continuous control outputs in the form of (4-20)mA or (0-5)volt etc., which can be used to control heater power through Thyristor power pack (for electrical heating system) or to control the position of a modulating motor valve (for oil or gas fired heating systems). The analog outputs can be directly connected to Libratherm make single phase / three phase SCR power controller which is ideally suitable for both resistive and inductive heating load. The programmed profile and other parameters are retained in the nonvolatile memory in the event of power failure. The serial interface of RS-485 on Modbus protocol is provided along with the Window based supporting software to monitor online and offline process behavior in both graphical and tabular form.