Consisting of sensor assembly, probe with filter assembly, transmitter, and interconnecting cable, Endura AZ40 measures efficiency of fossil-fired boilers and process heaters. Analyzer monitors combustion waste gases to measure both excess air and unburned fuel, and provides unburned fuel measurement in terms of carbon monoxide equivalent. Available in lengths up to 8+ ft and suitable for temperatures to 3,000°F, probe continuously draws in sample for analysis.