In the oxygen content analysis, especially the trace oxygen analysis, since the oxygen content in the air is as high as 21% VOL, if the improper treatment is easy to cause contamination and interference to the sample, the analysis result data is incorrect. The main reason is that the oxygen detector is not handled properly. Here are just a few of the factors that influence the measurement:
1. Simplification and cleanliness of the oxygen detector air circuit system. The microanalytical requirements must effectively eliminate the contamination of the sample tubes in the various pipe fittings on the gas path, chamfering machine valves, gauge heads, etc. Therefore, the manual pipe bending machine should simplify the air circuit system as much as possible, and use a connector with a small dead angle. And avoid the use of water seals, oil seals and wax seals to prevent the dissolved oxygen from escaping and causing pollution. It is also necessary to avoid the addition of purification equipment that is easy to cause pollution on the pipeline leading to the oxygen analyzer inlet. Only in this way can the system be clean and the data obtained be correct.
2. Contamination of the oxygen detector. When reusing the oxygen detector, first pay attention to whether air is leaking when connecting the sampling line, and the leaked air must be carefully blown out, so as not to allow a large amount of oxygen to pass through the sensor to extend the life of the sensor. In the purification process of the pipeline system, in order to shorten the purification time, a certain method is needed. The rivet machine generally uses high pressure deflation and small flow blowing to alternately perform rapid purification of the pipeline.
3. Selection of pipe material. Pipe material and surface roughness will also affect the change in oxygen content in the sample gas. It is generally not advisable to use plastic pipes, rubber pipes, etc. as connecting pipes. Copper or stainless steel tubes are usually used. For ultra-micro analysis (<0.1 ppm), polished stainless steel tubes must be used.
4. The leak problem of the oxygen detector. The oxygen detector must be strictly leak tested before it is first activated. The oxygen analyzer can only get the correct data results under tight conditions. Any connection points, solder joints, valves, etc. are not tight, which will cause oxygen in the air to reverse osmosis into the pipeline and inside the oxygen analyzer, resulting in high oxygen content.
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