Device and method for measuring the dew point temperature of a gaseous element

The invention relates to a device and its implementation method for measuring the dew point temperature of a gaseous element, alone or in mixture, which may have a low heat capacity and / or an aggressive chemical nature as the sulfur, outstanding for example in a pipeline, for working in a temperature range varying from one hundred degrees to 400 ° C. and providing an optimized measurement accuracy due to signal / noise optimized. For this purpose, the device includes a calorimetric block (2), two thermometric means (3, 4) and a measuring surface (8) thereof (3, 4, 8) each being in direct thermal contact with the calorimetric block and the gaseous element. Each thermometric means is adapted to generate a signal representative of the thermal effect associated with condensation and / or evaporation of the gaseous medium onto said surface (8).