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Limit Oxygen Index Tester Test Procedure

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 valve door, adjust the pressure relief valve, the pressure is 0.2~ 0.3mpa. Adjust trace regulator, to stable the velocity of oxygen and nitrogen gas flow through the rotor flowmeter instructions, see the float on the surface, and adjust to the work place, at the same time check whether instrument gauge at 0.1 Mpa, otherwise, shall, in accordance with the provisions of regulation to the pressure, the N2 + O2 pressure gauge is not greater than 0.03 Mpa or does not display the pressure is normal, more than the pressure should check whether there is burning the column charcoal, gas road jams phenomenon, until meet the requirements. When the concentration of oxygen is tested or changed, the system must be flushed for 30s.

After the oxygen index measuring system is developed, it is used to ignite the sample with c, butane or natural gas. The flame length is 6~25mm. After the sample is ignited, the ignition source is removed immediately and the time is immediately started.

In the process of sample combustion, the combustion condition of the sample is observed. If the sample burns above 180s, or burns more than 50mm, the oxygen concentration is too high and must be reduced. The concentration of oxygen must be increased if the sample is extinguished before or 50mm before 180s. It is necessary to measure the percentage concentration of oxygen when the sample is extinguished at 180s or 50mm. And three times, the average of three times oxygen concentration was calculated.

Calculate: the oxygen index meter test frequency three times, and calculate the average, take the decimal place one.
The calculation formula of oxygen index is as follows :(OI)=O2 / (O2 +N2) *100%.

Note: volume percentage represents oxygen index.The Limit oxygen index test chamber test results were compared with the oxygen index of the reference material.

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