The GI-700 stack gas analyser is designed to continuously measure the concentrations of nitrogen oxides (NOx), sulfur dioxide (SO2), carbon monoxide (CO), carbon dioxide (CO2), oxygen (O2), and ammonia (NH3) in stack flue gas streams. All component modules can be easily installed within a single 19 inch case. The compact design saves space, facilitates maintenance, and requires less wiring and tubing during installation.