Abstract: The invention concerns a method for determining the temperature stability of a hydrocarbon mixture capable of phase separation by monitoring the weight variations of a gravimetric sensor part of which is immersed in said mixture. The method consists in: a first step of accelerated cooling of said mixture to a predetermined temperature; and a second step during which said mixture is maintained at this temperature, the time-dependent variation curve of said weight enabling the determination of the resulting solid mass and the separation speed of the two phases by determining the slope of this curve, the stability of said mixture being obtained by comparison with hydrocarbon mixtures of which the stability in time at low temperature between 0 and -30.degree. C. has been controlled.

Abstract: A device for detecting and/or measuring a thermal phenomena occurring in a product showing a liquid state at a temperature within the range of temperatures swept by the detecting and/or measuring device. An enclosure is provided with a calorimetric head containing at least one measurement cell which is adapted to be filled and emptied. Heat is transferred to the cell and a magnitude relating to a temperature of the cell is measured so as to obtain desired information regarding the product.