The Limit oxygen index tester test requires the operator to calibrate the oxygen index meter before the test to ensure the accuracy of the test data. After calibration experiment, test requirement standard style for at least 15 root, respectively, in the style of any 50 mm at one end, insert the other end of the combustion on the tested style clip (the different forms, different thickness of the style, the test result is not). The initial oxygen concentration was determined prior to the oxygen index test. If you are not sure, you can ignite the sample in the air and watch the combustion. Oxygen combustion soon, if the sample of the initial concentration of 18%, selected if sample from fire immediately after lighting the flame in the air, depending on the ignition easily from fire after out of selecting oxygen concentration of 25% or more of the oxygen concentration. Determine the oxygen concentration and begin the formal test. First, open the oxygen and nitrogen cylinder va...