Teach you how to choose a gas detector correctly
1) Confirm the type and concentration range of the gas to be detected:
Every production sector encounters different types of gases. When choosing a gas detector, all possible situations must be considered. If there are a lot of methane and other less toxic alkanes, it is undoubtedly the most appropriate to choose an LEL detector. This is not only because the principle of the LEL detector is simple and widely used, but it also has the characteristics of convenient maintenance and calibration. If there are toxic gases such as carbon monoxide and hydrogen sulfide, it is necessary to choose a specific gas detector first to ensure the safety of workers. If there are more organic toxic and harmful gases, considering the low concentration that may cause personnel poisoning, such as aromatic hydrocarbons, halogenated hydrocarbons, ammonia (amine), alcohol, fat, etc., you should choose the photoionization method introduced in the previous chapter. detectors, do not use LEL detectors as this could result in personal injury or death. If the gas types cover the above types of gases, choosing a composite gas detector may achieve twice the result with half the effort.
2) Determine the occasion of use:
Different industrial environments require different types of gas detectors.
A) Fixed gas detector:
This is a detector that is widely used in industrial devices and production processes. It can be installed on a specific detection point to detect specific gas leaks. Yiyang fixed detector is generally two-body type. The detection head composed of sensor and transmitter is installed on the detection site as a whole, and the secondary instrument composed of circuit, power supply and display alarm device is installed in public places as a whole, which is convenient for monitoring. Its detection principle is the same as that mentioned in the previous section, but it is more suitable for the characteristics of continuous and long-term stability required by fixed detection in terms of process and technology. They should also be selected according to the type and concentration of the on-site gas. At the same time, attention should be paid to installing them in the part where the specific gas is most likely to leak. For example, the most effective height of the sensor installation should be selected according to the specific gravity of the gas.
B) Portable gas detector:
Because the portable instrument is easy to operate and small in size, it can be carried to different production sites. The Yiyang electrochemical detector is powered by alkaline batteries and can be used continuously for 1000 hours; the new LEL detector, PID and composite instruments use rechargeable batteries ( Some have adopted memoryless Ni-MH or lithium-ion batteries), so that they can generally work continuously for nearly 12 hours, so the application of such instruments in various factories and health departments is becoming more and more extensive.
C) Compound gas detector
The composite multi-gas detector can be equipped with multiple gas detection sensors required on one instrument, so it has the characteristics of small size, light weight, fast response, and multi-gas concentration display at the same time. More importantly, the price of Yiyang composite multi-gas detector is cheaper than multiple single-diffusion gas detectors, and it is more convenient to use. It should be noted that when choosing this type of detector, it is best to choose an instrument with the function of switching each sensor separately to prevent the damage of one sensor from affecting the use of other sensors. There are many choices for gas detection instruments. Gas detection instruments are often used in environments where harmful gases may endanger personal safety or may cause adverse consequences. The gas detection instrument is an indispensable detection instrument for early prevention of environmental pollution and guarantee of human life. Gas detectors are usually used to detect toxic, harmful or combustible gases. Toxic gas detectors are generally used in biochemical, pharmaceutical, construction and other industries, while combustible gas detectors are commonly used in gas environment detection in coal mines, petroleum, chemical, fuel and other industries. . The detection standards for different industries and situations are different, and the detection standards for different gases are also different. When choosing an easy-to-use gas detection instrument, pay attention to the use of the instrument according to the purpose and occasion of use. First, determine the type of gas to be detected and the concentration standard:
The gases to be detected in different environments are different. Before choosing a gas detector, the first thing to do is to determine what kind of gas to measure, what concentration range is suitable for this gas, and even Consider all possible situations. For example, in the environment where there are more methane or other less toxic alkane gases, it is best to choose the LEL detector; while the environmental testing of toxic gases such as CO and H2S must ensure the personal safety of the testers and the staff in the environment, so choose the LEL detector. Specific gas detector; for the chemical environment with more organic harmful gases (such as aromatic hydrocarbons, ammonia, etc.), you must choose a photoionization detector, which can not only obtain more accurate detection results, but also avoid the use of LEL The possibility of personal injury or death due to the detector. Finally, if there may be various gases mixed in the environment, then it is best to choose a composite detector is the most appropriate.
Secondly, the applicable occasions of different detectors should also be considered:
The fixed gas detector is a relatively large detection instrument used in industrial production and installations. It is an instrument installed at a fixed monitoring point to detect a certain fixed gas. The gas monitoring is completed by the circuit, sensor and alarm device. And choose the height position of the sensor installation according to the density of the gas. As the name suggests, the portable gas detector is light and small, easy to carry, and can be easily carried to different environments. And because its power supply is powered by alkaline batteries, the working time is longer, so its application is becoming more and more extensive.
