For large industrial boilers and furnaces, Rosemount Analytical X-STREAM O2 analyzer has AccuMax accuracy specifications, extended temperature capability, and probe lengths of up to 18 ft. In situ combustion flue gas analyzer provides information to control fuel-to-air ratio of burner as well as indication of stratification of flue gases inside the furnace. It can be adjusted after installation and repaired without removing probe from furnace duct.