The relative conductometric method was further developed with special attention to the determination of hydrogen in an attempt to contribute to the future automation of elemental microanalysis. All weighing processes except the weighing of the sample are eliminated. Sample combustion was simplified by the introduction of the empty tube with one open end, which offers the following advantages: (a) application of high temperatures is limited only by the properties of the furnace and the combustion tube; (b) the expensive quartz tubes are replaced by the cheaper porcelain tubes; (c) the increase of oxygen flow rate in connection with appropriate diameter and length of tube results of a reduction of combustion time to a few seconds; (d) all possible types of final determinations could be used; and (e) the introduction of the proportional division of the combustion products enables the simultaneous determination of several elements. The application of the relative conductometric methods provides basic facts for preliminary research in the automation of elemental microanalysis, as it is possible to observe the start, the performance, and the finish of a chemical reaction without delay, which makes it possible to study the combustion process itself. The automatic recording of results is guaranteed by the high standard of electronic data handling. The presence of a number of hetero elements and their influence on the carbon and hydrogen determination was taken into account during this work. It could be shown that nitrogen, fluorine, chlorine, bromine, iodine, phosphorus, and sulfur have no influence, as they are eliminated quantitatively by an external absorber. The introductive work for the automation of the elemental microanalysis has come to a temporary end by carrying out test series on a number of selected test compounds and the calculation of standard deviations of the results obtained, which proved that the proposed method gives results of equal quality compared with conventional methods.