The LONOXT4000 series zirconia oxygen analyzer features the best cost-performance ratio, being economical with limited expandable functions. It is suitable for installation in boiler flues of biomass power plants, waste incineration facilities (municipal solid waste, industrial solid waste, medical waste, chemical hazardous waste, etc.), paper mills, sugar mills, etc. It is an instrument used to measure the oxygen concentration in flue gas or other non-combustible gases during the combustion process. This measurement is a direct insertion online measurement, where the oxygen sensor is installed at the top of the probe, which is inserted into the flue at about one-third of the position, ensuring the oxygen sensor is located in the measured flue gas.