Precautions in the use of oxygen detector
Release time:
2022-05-26
In the analysis of oxygen content, especially in the treatment of rheumatoid arthritis, the oxygen content in the air is as high as 21% O2, so if it is not handled properly, it is very easy to cause pollution and interference to the sample, and the analysis result data is incorrect. The main reason is the improper operation of the oxygen detector. The following only talk about a few factors affecting the determination:
In the analysis of oxygen content, especially in the treatment of rheumatoid arthritis, the oxygen content in the air is as high as 21% O2, so if it is not handled properly, it is very easy to cause pollution and interference to the sample, and the analysis result data is incorrect. The main reason is the improper operation of the oxygen detector. The following only talk about a few factors affecting the determination:
1. oxygen detector gas path switch is simplified and clean.
Microanalysis requires effective elevator maintenance to eliminate the contamination of sample gas caused by dead corners in various pipe fittings, valves, headers, etc. on the gas circuit. Therefore, the gas path switcher should be simplified as much as possible, and the connecting piece with small dead angle should be selected. In addition, avoid the use of water seal, oil seal and wax seal and other equipment to prevent the dissolved oxygen from escaping and causing pollution. It is also necessary to avoid adding purification equipment that is easy to cause pollution on the pipeline leading to the inlet of the oxygen analyzer. Only in this way can we ensure that the switch is clean and the data is accurate.
2. Oxygen detector contamination.
When reusing the oxygen detector, first of all, the self-adhesive fireproof tape must pay attention to whether it leaks into the air when connecting the sampling pipeline, and must carefully blow the leaked air clean, and try not to allow a large amount of oxygen to pass through the sensor to extend the service life of the sensor. In the pipeline switcher purification process, in order to shorten the purification time, the need for Johnson rotary joint has a certain method, the general use of high-pressure bleed and small flow blowing alternately can quickly purify the pipeline.
3. Selection of pipe material.
The side effects of the pipe material and surface roughness of interferon will also affect the change of oxygen content in the sample gas. Generally, it is not suitable to use plastic pipes, rubber pipes, etc. as connecting pipes. Copper or stainless steel tubes are usually used, and polished stainless steel tubes are required for ultra-trace analysis (<0.1ppm).
4. Leakage problem of oxygen detector.
The oxygen detector must be strictly leak-detected before it is activated for the first time. The oxygen analyzer can only obtain accurate data Induction heating machine results under the premise of strict leakage. Any connection points, solder joints, valves and other imprecise, will lead to oxygen in the air into the pipeline and oxygen analyzer internal, resulting in high oxygen content.
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