Titan industrial Fourier transform infrared (FTIR) spectroscopy systems provide real-time, multi-component extractive gas-phase analysis for such applications as industrial hygiene, composite epoxy materials (CEM), process optimization/control, specialty gas quality-control, and research. They are packaged with externally mounted, corrosion-resistant gas cells, whose pathlengths range from 1 cm to 60 m. Thermal isolation enables operation at temperatures from ambient to 240_C, allowing moist sample streams to be analyzed without condensation.