Based on FTIR technology FT-2000P portable gas analyzer can continuously monitor various kinds of components in the emission, such as SO2, NOx (NO, NO2), CH4, NH3, HCL, HF, CO, CO2, O2, H2O. According to actual measuring need, it can be extended to measure other components, like SO3, N2O and etc. This portable system mainly comprises FTIR analyzer and sampling probe. It has features of high measurement accuracy, wide dynamic range and low detection limit.