Difficulties in the application of oxygen analyzer and online gas analyzer
A gas analysis instrument is a tool used for gas component analysis and verification. With the aid of it, data on certain component types and contents can be obtained. However, the gas analysis instrument is not a simple tool. It is neither as simple as a flow meter or a pressure gauge, nor as easy to use as various thermal instruments. It is a kind of tool with complex structure and more difficult to use technology. The use of gas analysis instruments is a more complicated and difficult to grasp special technique.
Generally speaking, the application of gas analysis instrument itself is a unique technical work, and it is a kind of research work, metallurgical microscope. However, this point is not recognized and understood by outsiders.
1. Difficulties in the application of gas analysis instruments
Regarding the difficulties in the application of gas analysis instruments, one can get a rough understanding from the following aspects. 2.1 Gas analysis is a series of chemical processes
A gas analyzer or a gas analysis system is equivalent to a complete set of chemical process equipment. Therefore, the working process of a gas analysis instrument system is to realize a series of chemical processes. If you want to get the correct data through gas analysis, you must understand the situation and changes in each stage of the series of chemical processes, and carefully study and grasp the rules in it. Only in this way can the correct measurement be achieved. It should be pointed out that not only does a gas analysis instrument have the same conditions and conditions of a chemical process, but sometimes the sample gas pretreatment part (including the sampling system) in the front stage of the instrument is also a chemical process. If you encounter more complicated and special technological conditions, the chemical process embodied in the sample gas pretreatment system is still very complicated, which is equivalent to the purification process of a small chemical plant. It can be seen that the process of gas analysis is to strictly control various factors that affect the measurement conditions under the conditions of understanding and grasping the entire chemical process system conditions, so as to obtain the correct data required by the process and governance staff.
2.2 It is more difficult to control influencing factors and eliminate interference factors during application
In the process of instrument application, there are many kinds of influencing factors and the changes are more complicated. It is more difficult to effectively control these influencing factors and eliminate the factors that interfere with the measurement. For example, the determination of trace oxygen must not only strictly control the material and seal of the system, but also clean the system and many other factors must be resolved one by one, otherwise, the oxygen component analysis will not get the correct measurement results. For the determination of the trace water content in the gas, in addition to considering the various influencing factors mentioned above, the problem of the adsorption balance of water in the sample gas in the pipeline must also be considered, and proper treatment of this problem must rely on repeated tests To understand its changes and laws, and grasp the manipulation techniques in order to get correct results. Of course, the use of gas chromatograph to determine the content of ppm-ppb impurity components in high-purity gas is more complicated to consider and control.
2.3 The influencing factors of trace gas composition analysis are more complicated
The microscopic changes that occur when gas components move in pipes and equipment are complex and changeable. Many influencing factors that can be ignored in the analysis of the composition of the constant gas, not only can not be ignored in the analysis of the trace gas composition, but must be taken seriously. At this time, these factors have become the main contradictions that affect the correct result of the analysis of the trace gas composition. Only in this way can the trace gas analysis instrument work be completed successfully. These influencing factors mainly include the following aspects:
â‘ The gas in the sampling pipeline is repeatedly mixed many times;
â‘¡Physical and chemical effects of the pipe wall and gas composition;
â‘¢ Pipe material;
â‘£ Piping connection method;
⑤The cleanliness of the pipeline.
2.4 Instrument and method verification is one of the keys to obtaining correct data. As a measurement and inspection tool, under normal operating conditions, most of the data given are relative values. The performance evaluation indicators of the laser particle size analyzer are introduced and determined. Whether the data is correct and the correct degree (accuracy) is not provided by the instrument itself, nor can it be verified. Must rely on peripheral technical work to complete, this is the verification of analytical data.
(1) Verification of instrument linear relationship. First of all, in order to ensure the normal operation of the instrument, the analytical instrument, as a kind of measuring instrument, must be tested by the authoritative measuring part in accordance with the regulations formulated by the state every year before it can be used. At the same time, a series of standard gases need to be used every year to check whether the linear relationship of the instrument in the entire linear range remains normal. Otherwise, blindly believe that the integrity of the analytical instruments (even imported instruments) will definitely cause the wrong data to lead to errors in production management and quality management.
(2) Error analysis. In the application of analytical instruments, for each measurement result data, an error analysis must be made to determine the authenticity, reliability, and credibility of the data analysis. A qualified analyst will not and should not casually report or publish the results of each analysis. Generally, after the measurement result is obtained, after an error analysis, when it is determined that the total error of the analyzed data is less than the specified allowable error, this one (or a group of) data is considered to be reported or published as the correct measurement result. Otherwise, incorrect data will have serious adverse consequences for production managers.
(3) Calibration of commonly used instruments for quantitative analysis. As a quantitative analysis instrument, gas analyzer must be calibrated (or calibrated) with standard gas before quantitative analysis. Standard gas is generally purchased from a national measurement section or a legitimate factory. In special cases, it can also be configured by itself (but with the qualification and ability to configure standard gas and related equipment). The shelf life of standard gas is one year. When using standard gas to calibrate analytical instruments, it is necessary to understand the normal procedures and usage rules. If the purchase and use of divergent standards meet the requirements, the analysis data will be greatly deviated. If you don't know the requirements for the use of standard gas, it will also cause trouble for air separation production because you can't get the correct data results.
2.5 Analytical engineers should strive for excellence and improve analysis and testing technology A qualified analytical engineer needs to continuously study and study new technologies of analytical instruments and new technologies of instrumental analysis, and apply them to their own work in time to achieve excellence and improve analytical testing technology purpose. An analytical engineer should not only be able to make the best use of the existing equipment, but also on the basis of a deep understanding of the principles, structure and performance of the instruments used today, absorb foreign and domestic advanced analytical technology at any time, and continue to innovate. Further improve and improve the detection level of existing instruments, not just satisfied with simple manipulation.
2. Conclusion
In short, trace gas analysis is a specialized technique, and it is also a work with a research nature. It determines the application effect and level of gas analysis instruments. The trace gas analysis technology is another real science, and it is necessary to go through a lot of experimental practice to find out the regularity of its neutralization, to grasp it well, and to solve various specific trace gas analysis topics satisfactorily. This is also the experience summary of the first generation of gas analysis workers in China when the development of high-purity gas began in the 1960s. Their conclusion from decades of gas analysis should arouse the attention of future generations. We hope that gas analysis technicians can achieve faster and greater development under the new situation of rapid development of air separation. Shanghai Shuangxu Electronics Co., Ltd. is willing to work with you to make due efforts for the domestic gas analyzer, and promote its qualitative Pentium to go higher.
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