The oxygen consumption, calculated by the oxygen concentration in the combustion product gas flow and the heat release rate of the combustion product during combustion, is one of the most important parameters in the combustion performance of the material. Accurately measuring the heat release rate of the material during combustion is extremely important for predicting fire hazards, as well as for flame retardant prevention and control. This complies with ISO5660-1/-2, ASTME1354, ASTME1740, ASTME