Analysis of factors affecting online gas analyzer

In the process of instrument application, there are many kinds of influencing factors of online gas analyzers and the changes are more complicated. It is difficult to effectively control these influencing factors and eliminate the factors that interfere with the determination. The factors that need to be considered and controlled when using gas chromatograph to determine the content of ppm-ppb impurities in high-purity gas are even more complicated.

In the process of instrument application, there are many kinds of influencing factors of online gas analyzers and the changes are more complicated. It is difficult to effectively control these influencing factors and eliminate the factors that interfere with the determination. For example, for the determination of trace oxygen, not only the system material and seal must be strictly controlled, but also many factors such as the cleanliness of the system must be solved one by one, otherwise, the oxygen component analysis will not get the correct measurement results. For the determination of trace water content in gas, in addition to considering the various influencing factors mentioned above, the adsorption equilibrium problem of water in the sample gas in the pipeline must also be considered. The proper handling of this problem must rely on repeated experiments, understanding its changes and laws, and mastering the manipulation techniques in order to obtain correct results. Of course, the factors that need to be considered and controlled when using gas chromatograph to determine the content of ppm-ppb impurities in high-purity gas are even more complicated.

The microscopic changes that occur when gas components move in pipelines and equipment are complex and changeable. Many influencing factors that can be ignored in the analysis of constant gas components should not be ignored in the analysis of trace gas components, but should be taken seriously. At this time, these factors have become the main contradictions affecting the correct results of trace gas component analysis. They must be eliminated and solved one by one to ensure the smooth operation of the trace gas analysis instrument. These influencing factors mainly include the following aspects:

① Repeated mixing of gases in the sampling pipeline;
② Physical and chemical effects between the pipe wall and the gas components;
③ Pipeline material;
④ Pipeline connection method;
⑤ Pipeline cleanliness.