Difference Between Gas Analyzer and Gas Detector
The gas analyzer is a flow analysis instrument for the measured gas composition. In many production processes, especially those with chemical reactions, it is often not enough to automatically control processes according to physical parameters such as temperature, pressure and flow. There are many kinds of gas analyzers due to the diversity of the gas types being analyzed and the analytical principles. The commonly used gas analyzers include infrared gas analyzers, laser gas analyzers, ultraviolet gas analyzers, thermal conductivity gas analyzers, electrochemical gas analyzers, etc.
The gas detector or gas leak detector is a kind of gas leak concentration detection instrument, including portable gas detector, handheld gas detector, fixed gas detector, online gas detector.
The following is an introduction to the difference between a gas analyzer and a gas detector.
A gas detector has simple structure, consisting only of the probe (sensor) and the sensor signal conversion circuit. A gas analyzer not only has a probe (sensor) inside, but also has a complete set of pneumatic system, which introduces the sample gas into the instrument, and then discharges out of the instrument or recovers.
The gas detector completes the detection by exposing the sensor in the detected gas or sample gas directly, while the gas analyzer introduces the detected gas or sample gas into the instrument for testing firstly in a special way and then discharges the gas.
Control methods for detection conditions
The gas detector doesn't involve the adjustment and control of the technological conditions of the sample gas process, and it makes the detection directly without considering the environmental conditions of the sample gas.
The gas analyzer is equipped with the whole set of air system inside and the exterior supporting equipment, which forms a complete chemical process. The gas analyzer can adjust and control the working conditions of the sample gas comprehensively, so as to achieve the normal and stable working of the sensors. And this is the guarantee that the gas analyzer can obtain accurate data.
Operation methods in completing the detection process
When using a gas detector, the instrument is placed into the tested environment and the measurement value can be obtained.
The gas analyzer shall introduce the sample gas into the instrument and then strictly adjust the technical process conditions such as temperature, pressure, and flow rate etc., to get the accurate the detection data.
Different ways to exclude interference factors in detection
The gas detector carries out the detection by exposing the sensor directly in the tested environment and whether there are interferences is not taken into consideration in the instrument structure design and the actual application. The gas detector is not designed to eliminate all kinds of interference factors.
However, the design, selection and use of gas analyzer should be taken into account various internal and external factors like temperature and pressure that will affect the gas measurement and carefully exclude them one by one. Only by this can the detection data be obtained accurately. Otherwise, the detection result will not be accepted or allowed once one factor is improperly ignored.
Gas detector can only provide qualitative analysis results and a rough quantitative analysis data, and cannot undertake the error analysis (because only analyzed data deviating from the true value is very small and then it comes to "error"). Therefore, it can not be regarded as an accurate analysis of the data to provide the basis for determining the important technology improvement and adjustment.
Gas analyzer is a strict measuring instrument. In the quantitative analysis, it can provide very accurate data which can be used as the basis of gas production and safety production improvement, to guide and carry out production management, quality management and enterprise management. Even more, this kind of data can be used as an important basis for the work of judicial and criminal investigation, and can be used to carry out lawsuits and determine the boundary between right and wrong.