The CHROMA TCD is an automatic industrial gas analyser. The sample comes through the sampling loop. Then the sample is injected into an analytical column for separation. The system uses packed or capillary column. Application n°13 example : The first column allows to separate CH4, CO2 from the composite peak (H2, O2, N2, CO), and the compounds of the composit peak are separated on the second column. The temperature setting is isothermal. The Wheatstone bridge is supplied in Voltage. The automatic valve permits the sample’s injection. In standard we can program the column temperature and cleaning method. The Vistachrom software enables the user to visualize and store data on a PC. Furthermore it provides comfortable utilities to recalculate, calibrate and export data and to set-up measurement. The airmoTREND software allows the calculation of retention time, area, mass or concentration profiles.