Abstract: In a thermal analysis process for investigating thermal phase transformations, a sample and a reference substance are placed into a furnace with rising temperature of a predetermined rate operated by a programmed temperature controller. The temperatures of the sample and reference substance are sensed by temperature sensors. The temperature difference is determined by a device having an output signal which is proportional to the temperature difference and which is generated by the known quasi-static heating technique. The temperature difference is automatically controlled continuously so that the thermal phase transformation of the sample takes place at a constant rate. The output signal which is function of time t, is integrated with respect to time by an integrating unit and the output signal of the integrating unit is further transformed into a signal dependent on the temperature of the sample.

Abstract: A temperature controlling system for investigating thermal transformation having a program-controller operated furnace the temperature of which is changed with a predetermined speed, and into which a sample and a reference substance containing elements with identical thermal parameters are placed. The sample and the reference substance containing elements are coupled with temperature sensing elements detecting their temperature and both elements are connected to a temperature comparing unit forming the difference of the two temperatures. The output of the temperature comparing unit is coupled through a differentiating network, limit switches and an actuating unit with a quasi-static temperature input of the program controller.