The oxygen index tester with digital display is used to evaluate the combustion performance of polymers under specified test conditions, that is, to measure the volume percent concentration of low oxygen that polymers merely maintain. The commonly used standards are IOS 2406 and IOS 5454, QINSUN is a manufacturer of textile testing instruments, which can provide various textile testing instruments.Welcome customers who need to inquire in time.
Open the oxygen and nitrogen cylinder valves, adjust the pressure reducing valve, the pressure is 0.2~0.3MPa. Adjust the micro-adjustment valve until the oxygen and nitrogen flow with a stable flow rate is indicated by the rotameter, look at the top surface of the float and adjust it to the working position. At the same time, check whether the instrument pressure gauge pointer is at 0.1Mpa , otherwise adjust to the specified value. Pressure, the N2 + O2 manometer does not exceed 0.03Mpa or does not display the pressure, which is normal. If the pressure exceeds this pressure, check whether there is carbon formation in the combustion column or clogging of the gas path until it meets the requirements. Before testing or when changing the oxygen concentration, the system should be purged for 30 seconds.
After flushing the digital display oxygen index measuring instrument system, ignite the sample with propane, butane or natural gas, the flame length is 6~25mm, after igniting the top end of the sample, immediately remove the fire source, and immediately start marking time.
During the burning process of the sample, pay attention to the burning condition of the sample. If the sample burns for more than 180 seconds or more than 50mm, it means that the oxygen concentration is too high and should be removed. reduced. If the sample is extinguished before 180 s or 50 mm, the oxygen concentration should beraised. The volume percent concentration of oxygen should be measured when the sample is quenched at 180 s or 50 mm. And repeat three times, take the average value of three oxygen concentrations to calculate.
Calculation: The number of times the oxygen index meter is tested is three times, and the average value is calculated and one decimal place is taken.
The formula for calculating the oxygen index is as follows: (OI)=O2/(O2+N2)*100%
Note: The volume percentage represents the oxygen index p
Test After the average value is obtained, compare it with the oxygen index value of the reference material to obtain the test result.
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