1 Infrared gas analyzer is to realize 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 the gas analysis instrument system is to realize a series of chemical processes. If you want to obtain correct data through gas analysis, you must understand the conditions and changes in each stage of this series of chemical processes, carefully study and grasp the laws, and only in this way can you achieve the purpose of correct determination. It should be pointed out that not only does a gas analysis instrument have the same conditions and conditions as a chemical process, but sometimes the sample gas pretreatment part (including sampling system) at the front stage of the instrument is also a chemical process. If it encounters 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 gas analysis process of the ammonia nitrogen online analyzer is to strictly control various factors affecting 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 management staff.
2 It is difficult to control the influencing factors and eliminate the interference factors in the application process
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, for the determination of trace oxygen, not only must the system material and sealing be strictly controlled, but also many factors such as the cleanliness of the system must also 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 the various influencing factors mentioned above, the adsorption balance of the water in the sample gas in the pipeline must also be considered, and the proper treatment of this problem must rely on trial and error , Understand its changes and laws, grasp the manipulation techniques in it, in order to get correct results. Of course, the influencing factors that need to be considered and controlled for the determination of ppm-ppb level impurity content in high-purity gas using gas chromatograph are more complicated.
3 The influencing factors of trace gas composition analysis are 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 the composition of the macro gas, not only cannot be ignored in the analysis of the composition of the trace gas, but must be taken seriously. At this time, these factors have become the main contradiction that affects the correct result of the analysis of the trace gas composition, and must be eliminated one by one. Only by solving can the work of trace gas analysis instrument be completed smoothly. These influencing factors mainly include the following aspects:
①The gas in the sampling pipeline is repeatedly mixed several times;
②The physical and chemical interaction between the pipe wall and the gas composition;
④Pipeline connection method;
⑤The cleanliness of the pipeline.
4 Instrument and method verification is one of the keys to obtaining correct data. Instrument as a measurement and testing tool, under normal operating conditions, most of the data given by the alcohol alarm, hydrogen sulfide alarm, and hydrogen chloride alarm are relative values. The performance evaluation index of the laser particle size analyzer is introduced. Whether the measured data is correct and correct (precision), the meter itself cannot provide the installation of a gas alarm, and the safe use of gas stoves can not be verified. Must rely on peripheral technical work to complete, this is the verification of the analysis data.
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