Process and device of elemental analysis

The present invention relates to a process and a device of elemental analysis of the Carbon, Hydrogen, Nitrogen, and Sulfur content by means of flash combustion in oxygen and for the analysis of the Oxygen content by means of pyrolysis. Elemental analysis of a sample is carried out in an oxygen atmosphere in a combustion reactor and the volume of oxygen required for analysis is determined by means of the algorithmwhere Qis the volume of oxygen required and Qis the weight of the sample to be analyzed and =Q/Qwhere Qis the volume of oxygen necessary for the combustion of a predetermined quantity Qof the sample to be analyzed, the volume of oxygen Qis then fed in pulsed mode to the combustion reactor, by means of a flow detector.