There are different techniques for the determination of CHN\CHNS\O. It brings a new level of precision, accuracy, speed of analysis and ease of operation.The built in chromatographic column converts the compound and elutes it in the form of NO2,CO2, SO2,H2O which are then detected with the help of Thermal Conductivity Detector.

 The instrument is calibrated with the analysis of std compounds using the K-factors calculations. Thus the instrument ensures maximum reliability of the results because the combustion gases are not split or diluted but directly carried to build in GC system simultaneous determination of CHNS can be done in less than 10 mins. This method finds greatest utility in finding out percentages of C, H, N, S, (O) in organic compounds which are generally combustible at 1800^o C.
Key components of CHNS are auto sampler, combustion reactors ,chromatographic column, and T.C.D. detector.