NOx gas analyzer also features a cooled photomultiplier detector for absolute stability and low-level sensitivity, temperature-controlled reaction chamber and a neon ozonator lamp. The new model analyzer is designed for the continuous monitoring of NO and NOx gas for combustion research and compliance monitoring in industrial and automotive and gas turbine applications. The gas analyzer has a totally automatic microprocessor-based operation including auto-startup, auto-calibration, auto-range, internal parameter monitoring and alarms. They are used to adjust the tertiary air register to the optimum opening. The oxygen analyzer is used to guide adjustment of the secondary air register, and the NOx analyzer output will guide tertiary register positioning. They are also used to continuously measure the total concentration of oxides of nitrogen within a gaseous sample. Noxidizers use NOx analyzers.