Gas detection tube technology
Gas detection tube technology
With the development of modern industry, the application of gas has become more and more extensive and complicated. Some of these gases can endanger human health, and some can cause fire or explosion. To analyze and detect these components and gases with complex concentrations, it is generally necessary to use complex analytical instruments, which can only be carried out through highly specialized technical training, and the results are generally not available on the spot. However, in some cases, it is necessary to immediately obtain the concentration of certain gases in the environment. For example, in an emergency, it is necessary to quickly make a judgment on the type and concentration of the gas on the spot so as to make a corresponding disposal plan in time. At this time, the simple, fast, direct reading gas detection tube method can play a great role.
The gas detection tube is also called a direct reading type detection tube. The appearance is an elongated glass tube sealed at both ends, and the inside is filled with a silica gel or alumina carrier to which a detecting agent is attached (sometimes an anti-interference absorbent or a moisture absorbent). The outer surface of the glass tube is printed with a scale indicating the gas concentration, and the concentration unit is generally ppm, and some are also expressed in % or mg/m3. When performing gas detection, the detection tube is loaded on a dedicated gas sampling pump for sampling. When the measured gas passes through the detection reagent carrier and chemically reacts, the carrier will change color, and the scale is read according to the length of the color changing layer. , you can instantly know the concentration value of the gas.
In 1919, Americans invented the world's first test tube. This test tube is used to detect the concentration of carbon monoxide (CO) in the working environment. The early gas detection tube was not a direct reading, but the colorimetric method was used to compare the discoloration of the detection tube with the color chart to obtain the concentration of the gas to be measured.
With the development of science and technology, in the 1960s, developed countries such as the United States, Japan, and Western Europe greatly expanded the technology by using detection tube technology as a simple and rapid detection method. The gas detection tube has evolved from a colorimetric type to a direct reading type. The types of gases that can be detected have been expanded from the first few to hundreds, and the detection range has reached a wide area of ​​ppb to %. The concentration readings are more and more vivid (discoloration is obvious) ), the accuracy is getting higher and higher. Nowadays, many well-known companies that produce gas detection tubes, such as the gas detection tubes of Japan GASTEC, cover almost all gas applications.
As a widely used technology, gas detection tubes have developed relevant production and use standards. Test tubes have been described in standards such as NIOSH in the United States, JIS K0804 in Japan, BS5343 in the United Kingdom, and DIN33882 in Germany. SEI also has certified standards for gas detection tubes. In 1987, China formulated the national standard GB7230-1987 gas detection tube, which stipulated the definition, specifications, technical performance, test methods, inspection rules and marking requirements of gas detection tube devices.
As a simple, fast and direct reading method, the gas detection tube method has its unique advantages. In many countries, the detection tube method is widely used as a supplement to the precision detection method. At the manufacturing technology level, developed countries such as Japan and Germany are in a leading position. In China, whether it is research and development of test tube manufacturing technology, or at the application level, it is still in a relatively backward position. Therefore, the domestic test tube market is still mainly imported. With the emphasis on environmental and occupational health in China and the development of technology, the demand for high-quality detection tubes has increased year by year, and it is believed that there will be better market application prospects.
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