The difference between gas analyzer and gas detector
Gas analyzers are process analytical instruments that measure gas composition. In many production processes, especially those with chemical reactions, it is often not enough to automatically control the process based on physical parameters such as temperature, pressure, and flow. Due to the wide variety of analyzed gases and the various analysis principles, there are many types of gas analyzers. Commonly used are infrared gas analyzers, laser gas analyzers, ultraviolet gas analyzers, thermal conductivity gas analyzers, electrochemical gas analyzers, etc.
Gas detector is an instrumentation tool for gas leakage concentration detection, including: portable gas detector, hand-held gas detector, fixed gas detector, online gas detector, etc. The following is an introduction to the difference between a gas analyzer and a gas detector.
1. The structure of the instrument is different
The structure of the gas detector is relatively simple, only including the probe (sensor) and the sensor signal conversion circuit part. The gas analyzer is not only equipped with a probe (sensor) inside but also has a complete set of gas circuit system, which is to introduce the sample gas into the instrument, and then lead out the complete set of gas circuit system for the instrument to be emptied or recovered.
2. Different detection methods
The gas detection and alarm instrument 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 a special method, and then leads it out of the instrument to vent.
3. The control methods for the measurement conditions are different
The gas detection and alarm instrument does not involve the adjustment and control of the technical conditions of the sample gas, and it does not consider the environmental conditions of the sample gas at all, and directly detects it. A complete set of gas circuit system and external supporting equipment inside the gas analyzer constitute a relatively complete chemical process flow. The gas analyzer internally adjusts and controls the working conditions of the sample gas in an all-round way to achieve the normal and stable operation of the sensor. Purpose, this is the guarantee that the gas analyzer can obtain accurate measurement data.
4. The operation method to complete the whole measurement process is different
When the gas detection and alarm instrument is in use, you only need to place the instrument in the measured environment, 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., in order to obtain accurate measurement data.
5. In the detection process, the way to eliminate interference factors is considered differently
The gas detection and alarm instrument is measured by placing the sensor directly in the large ambient atmosphere. The design of the instrument structure 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 it does not have the ability to eliminate various interference factors. Designing 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.
6. The accuracy of the data is different
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 used for error analysis (because only when the analysis data deviates from the true value can we talk about "error") , therefore, cannot at all be used as accurate analytical data to determine (decision) important process improvement adjustment measures. The gas analyzer is a strict measuring instrument, which can provide very accurate data during quantitative analysis. This data can be used as the basis for the improvement and improvement of gas production and safety production, and use it to guide and carry out Production management, quality management and business management. Even, this kind of data can be used as an important basis for judicial and criminal investigation work, and it can be used to fight lawsuits and determine the boundaries of right and wrong.
7. The life of the sensor is different
Gas detector sensors are exposed to the environment, many factors are affected, and the sensor life is short. The gas analyzer sensor is placed inside the instrument with good quality, high precision and long life.
8. Different calibration methods
If the gas detector drifts after a period of use, it needs to be returned to the manufacturer for calibration and calibration. The process is cumbersome and costly.
Use high, affect the field use. The gas analyzer adopts the on-site calibration method, which can be completed independently as long as there is standard gas on site. The method is simple, does not affect on-site use, and is low in cost.
