In the analysis of oxygen content, especially trace oxygen analysis, since the oxygen content in the air is as high as 21% O2, if it is not handled properly, it will easily cause contamination and interference to the sample, and the analysis result data will be incorrect. The main reason is the improper operation of the medical oxygen analyzer.
The medical oxygen analyzer must be strictly checked for leaks before being put into use for the first time. Medical oxygen analyzers can only obtain accurate data results under the premise of tight leaks.
Any lack of tightness in connection points, solder joints, valves, etc. will cause oxygen in the air to reverse osmosis into the pipeline and the interior of the medical oxygen analyzer, resulting in a high oxygen content.
When reusing the medical oxygen analyzer, you must first pay attention to whether there is air leakage when connecting the sampling pipeline of the medical oxygen analyzer, and you must carefully blow off the air leaking into the medical oxygen analyzer, and try not to let a large amount of oxygen pass through. Sensors for medical oxygen analyzers to extend sensor life.
In the process of purifying the pipeline system, in order to shorten the purification time, a certain method is required. Generally, high-pressure degassing and low-flow blowing are alternately used to quickly purify the medical oxygen analyzer pipeline.
The material and surface roughness of the medical oxygen analyzer pipeline will also affect the change of the oxygen content in the sample gas. Generally, plastic pipes, rubber pipes, etc. should not be used as connecting pipes. Medical oxygen analyzers usually use copper tubes or stainless steel tubes. For ultra-trace analysis (less than 0.1ppm), polished stainless steel tubes must be used.
The micro-analysis requirement of the medical oxygen analyzer must effectively eliminate the pollution caused by the dead ends of various pipe fittings, valves, and meter heads in the gas path to the sample gas. Therefore, the gas circuit system of the oxygen analyzer should be simplified as much as possible, and the connecting parts with small dead angle should be selected.
In addition, avoid the use of water seals, oil seals, wax seals and other equipment to prevent pollution caused by the escape of dissolved oxygen. It is also necessary to avoid adding purification equipment that is likely to cause pollution to the pipeline that leads the sample gas to the inlet of the oxygen analyzer. Only in this way can the system be clean and the data obtained be accurate.
Pay attention to the above points, when using and selecting a medical oxygen analyzer, it will be used with a high probability.