Abstract: An improved system for and method of precisely controlling the temperature at a predetermined location at a preselected temperature selected from a range of temperatures is described. The preferred system for carrying out the preferred method includes a mixing valve for separating a fluid stream into first and second component streams and adjustable in response to a first contol signal so as to control the amount of separation of first and second component streams. The preferred system also includes a heater for heating the first compponent stream in response to a second control signal, a first evaporator for cooling the second component stream and a conduit for combining the heated and cooled component streams so as to provide a mixed stream to the predetermined location. The first and second control signals are provided as a function of the preselected temperature, the temperature of the heated first component stream, the temperature of the mixed stream and the temperature at said predetermined location.

Abstract: A system for and method of precisely controlling the temperature of an electronic component through a range of temperatures by controlling the temperature of a gas forced into contact with the component is disclosed. The system comprises a dual control loop including two sensors, one for measuring the temperature of the gas and the other for sensing the temperature of the component, for controlling the temperature of the gas so as to provide accurate control of the temperature of the component.