In the chemical industry, the raw materials of the production process often contain flammable and explosive chemical media or gases. The chemical properties of these flammable and explosive media and gases vary widely. If the explosion conditions are met, the safety of the site will be difficult to control. In order to ensure the life safety of production personnel and the property safety of production equipment, my country's explosion-proof technical measures gradually cover various related industries, and a series of industry, national and international standards have been formed for explosion-proof requirements.
For automation instruments, the most common explosion-proof forms are intrinsically safe, explosion-proof and increased safety. Based on the rapid development of low-power electronic devices, intrinsically safe explosion-proof technology has been widely promoted and applied. Intrinsically safe type is abbreviated as intrinsically safe type. Compared with other explosion-proof forms, intrinsically safe type has the characteristics of simple structure, wide application range, easy operation and convenient maintenance. It mainly achieves the purpose of explosion protection by suppressing the ignition source energy. In industrial situations, common intrinsically safe instruments include tuning fork level switches, vibrating rod level switches, and so on. So, what are the advantages of intrinsically safe instruments?
1. Since the energy of the electric spark or thermal effect generated by the meter circuit during normal use or failure is less than 0.28mJ, that is, the gas concentration is 8.5% (the most explosive concentration) and the minimum ignition energy, so the design of the meter casing does not need to be too Complex, that is, the volume of the shell is not as large and heavy as the flameproof shell. Therefore, intrinsically safe instruments generally have the characteristics of simple structure, small size, light weight and low cost.
2. The circuit of the meter is restricted, that is, the voltage and current of the meter are restricted, so it can be maintained or replaced some parts of the meter when the meter is live, which is convenient and efficient.
3. Intrinsically safe instruments will not reduce the safety and reliability of the instrument itself due to the loss of fastening bolts or the corrosion, incompleteness, or man-made damage on the surface of the casing.
4. It can be seen from 1-2 that intrinsically safe explosion-proof technology is a kind of "weak current" technology. Therefore, intrinsically safe instrument not only means that its own safety index is high, but also can avoid the occurrence of electric shock accidents of on-site engineering and technical personnel. .
5. Intrinsically safe instruments have a wide range of applications. Intrinsically safe technology can be said to be the only explosion-proof system that can be applied to zone 0 hazardous locations.
6. For devices as simple as thermocouples, they can be connected to the intrinsically safe explosion-proof system without special certification.
Compared with any other explosion-proof type instrument, intrinsically safe instrument has very outstanding characteristics. However, although intrinsically safe instruments can minimize possible dangerous situations, due to the complexity of the industrial site, the safety of the staff still needs to pay more attention to prevent all potential safety hazards.
The above is an introduction to the advantages of intrinsically safe instruments. If you want to learn more about level switches (level switches, level switches), level meters (level meters, level meters) and other level measuring instruments, Welcome to follow WeChat public account: Jiweimeter. (The article is excerpted from:, please indicate the source for reprinting.)
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