The difference between gas analysis and gas detection
1. Differences in instrument structure
The structure of the gas detector is relatively simple, consisting only of a probe (sensor) and a sensor signal conversion circuit. The gas analyzer is not only equipped with probes (sensors) inside, but also has a complete gas path system, which introduces the sample gas into the instrument and then leads out the complete gas path system for instrument venting or recovery.
2. Different detection methods
The gas detection alarm uses a probe directly exposed to the tested air or sample gas environment for detection. The gas analyzer introduces the measured gas (sample gas) into the instrument through a special method for measurement, and then exhausts it outside the instrument.
3. Different control methods for measuring conditions
The gas detection alarm does not have an adjustment and control part for the technical conditions of the sample gas process, and it does not consider the environmental conditions of the sample gas and directly performs detection.
The complete set of gas path system and external supporting equipment inside the gas analyzer constitute a relatively complete chemical process flow. The gas analyzer adjusts and controls the working conditions of the sample gas in all aspects to achieve the normal and stable operation of the sensor. This is the guarantee that the gas analyzer can obtain accurate measurement data.
4. Different methods of operation are used to complete the entire measurement process
When the gas detection alarm is applied, simply place the instrument in the measured atmosphere, and the instrument can display the value. And the gas analyzer must carefully introduce the sample gas into the instrument, and then strictly adjust the process technical conditions, such as temperature, pressure, flow rate, etc. Only when the operator adjusts the instrument until a stable chemical process is achieved, can accurate measurement data be obtained. The data obtained before this is incorrect and must be discarded.
5. Different ways of considering the elimination of interference factors during the detection process
Gas detection alarm is a device that directly places the sensor in the ambient atmosphere for measurement. The design of the instrument structure and the actual use of the detection process do not consider the presence or absence of interference factors in the ambient atmosphere, and do not have the design ability to eliminate various interference factors. When designing, selecting, and using gas analyzers for testing, various internal and external factors that affect the measurement must be fully considered, and they must be carefully eliminated one by one to ensure the accuracy and authenticity of the testing data. Otherwise, neglecting a certain influencing factor inappropriately is not allowed and unacceptable for detection.
6. Different accuracy of data
Gas detectors can only provide qualitative analysis results and relatively rough quantitative analysis data. The data displayed by such instruments cannot withstand scrutiny and cannot be subjected to error analysis (because only when the analysis data deviates from the true value very little can "error" be discussed). Therefore, they cannot be used as accurate analysis data to determine (determine) important process improvement and adjustment measures. And gas analyzer is a strict measuring instrument that can provide very accurate data during quantitative analysis. This data can be used as a basis for improving and enhancing gas production and safety production, guiding and conducting production management, quality management, and enterprise management. Even this data can serve as an important basis for judicial and criminal investigation work, using it to file lawsuits and determine the boundaries of right and wrong.
