New calorimetric detectors for measurements of enthalpies of formation of liquid ionic and metallic systems in the temperature range 1000°–1500 °C have been designed and assembled. Much attention was paid in designing these new detectors in order to obtain reliable data. The mixing method, used with a stirring device, allows avoidance of parasitic thermal effects, and therefore improves the accuracy of the measured heat of mixing. The acquisition and treatment system of the calorimetric data is described.