Do you know the difference between a "gas detector" and a "gas analyzer"?
Although gas detectors and gas analyzers use various gas sensors to measure gas concentration in principle, they are widely used in petrochemical, coal, metallurgy, chemical industry, municipal gas, environmental monitoring, steel, electric power and other places . However, they are quite different in their functions, structures, detection methods, detection accuracy, control methods, operation methods, and interference removal methods, as follows.
1. Different functions
The gas detector is an instrumentation tool for gas leakage concentration detection, which belongs to the safety protection instrument.
A gas analyzer is a process analysis instrument used to measure gas composition and an instrument for detecting gas composition. Such as detection of smoke components.
2. Different structure
The structure of the gas detector is relatively simple, only including the gas probe (gas sensor) and the sensor signal conversion circuit part.
The gas analyzer is not only equipped with a gas probe (gas sensor) inside, but also has a complete set of gas circuit system, that is, the sample gas is introduced into the instrument, and after pretreatment and component analysis, it leads to a complete set of gas circuit for venting or recycling the instrument. system.
3. Different detection methods
The gas detector uses the probe to directly expose to the measured air or sample gas environment for detection.
The gas analyzer introduces the measured gas (sample gas) into the instrument for measurement through special methods (pump sampling, in-situ sampling, etc.), and then leads it out of the instrument for emptying or recycling.
4. Different detection accuracy
Gas detectors can only provide qualitative analysis results and relatively rough quantitative analysis data. The data displayed by this instrument cannot withstand scrutiny and cannot be analyzed for errors. (Because the "error" can only be talked about when the analytical data deviates from the true value very little), therefore, it cannot be used as an accurate analytical data to determine (determine) important process improvement adjustment measures. However, it can be used as a qualitative detection, such as the basis for making a signal alarm when a certain concentration is reached.
A gas analyzer is a strict measuring instrument that can provide very accurate data when performing quantitative analysis. This kind of data can be used as the basis for industrial production, gas production, safety and environmental protection improvement and improvement, and use it to guide and carry out production management, quality management and enterprise management. This kind of data can be used as an important basis for production technology, judicial appraisal, product quality supervision, scientific and technological arbitration, environmental protection emission inspection, etc., and even use it to determine the boundaries of right and wrong in lawsuits.
5. The control methods for the measurement conditions are different
The gas detector does not design the adjustment and control part of the technical conditions of the sample gas, and it does not consider the environmental conditions of the sample gas, and directly detects it.
A complete set of gas circuit system and external supporting equipment inside the gas analyzer constitute a relatively complete process flow of physical methods and chemical methods. The gas analyzer internally adjusts and controls the working conditions of the sample gas in all directions to ensure To achieve the purpose of normal and stable operation of the sensor, this is the guarantee that the gas analysis instrument can obtain accurate measurement data.
6. The operation methods for completing the whole measurement process are different
When the gas detector is in use, just place the instrument in the measured atmosphere, and the instrument can display the value.
The gas analyzer must carefully introduce the sample gas into the instrument, and then strictly adjust the technical conditions of the process, such as temperature, pressure, flow, etc., only when the operator adjusts the instrument until a stable analysis of the chemical process can be obtained. Accurate measurement data.
7. Different ways to eliminate interference factors
The gas detector is measured by placing the sensor directly in the large ambient atmosphere. The structure design of the instrument and the actual use of the detection process do not consider whether there are factors that interfere with the measurement in the large ambient atmosphere, and there is no design to eliminate various interference factors. ability.
When designing, selecting and using a gas analyzer, various internal and external factors that affect the measurement must be fully considered, and they must be carefully eliminated one by one. Only in this way can the accuracy and authenticity of the detection data be ensured. Otherwise, improperly ignoring a certain influencing factor is not allowed and unacceptable for testing.
