Infrared heating principle in infrared moisture analyzer

April 24, 2024

Absorption, reflection, and transmission occur when far-infrared radiation is radiated to an object. However, not all molecules can absorb far-infrared radiation, and only those polar molecules that show electricity can work. Water, organic substances, and high molecular substances have a strong ability to absorb far-infrared rays. When these substances absorb the far-infrared radiation energy and make its molecules, the frequency of natural vibrations and rotations of atoms coincide with the frequency of far-infrared radiation, molecules or atoms are likely to resonate or rotate, resulting in greatly increased movement and conversion into The heat energy raises the temperature inside, so that the substance is quickly softened or dried. The general heating method is the use of heat conduction and convection, the need to spread through the media, slow speed, high energy consumption, and far-infrared heating is the use of heat radiation, without media transmission. At the same time, since the radiant energy is proportional to the fourth power of the heating element, it not only saves energy, but also has high speed and high efficiency.

In addition, far-infrared rays have a certain penetrating power, because the heated and dried substance absorbs far-infrared radiation energy at a certain depth and at the same time, and generates a self-heating effect, so that the solvent or water molecules evaporate, and the heat is even, thereby avoiding Deformation and qualitative change due to different degree of thermal expansion, so that the appearance of the material, physical and mechanical properties, fastness and color, etc. remain intact.

Infrared moisture analyzer is mainly determined by infrared radiation heater and electronic balance to determine its accuracy and stability. (Infrared radiation heater: tungsten filament vacuum tube can radiate near infrared ray, silicon carbide is a long wavelength infrared radiation heater, quartz glass and ceramics Infrared heaters can radiate mid-infrared rays. Infrared Moisture Analyzers The moisture measurement method is based on the well-known standard method of moisture measurement. The "dry reduction method" is very similar to an infrared moisture meter that performs heat drying and mass measurement. The "dry reduction method" of the accepted standard method is also referred to as (105°C for 5 hours), (135°C for 3 hours), and the like, and the heating is performed for a long time by placing the sample in a dryer. Drying was used to accurately determine the mass change before and after drying, and the amount of water was calculated. For this reason, the measurement personnel need to be very proficient in equipment and technology. Since it takes a long time for the measurement, it is difficult to quickly measure a large number of samples.

Therefore, for the measurement of a wide variety of samples with a high degree of accuracy, it is not necessary to do so except for an infrared moisture meter. Although there are some other electrical and optical measurement methods, they are all special instruments that limit the measurement object. In terms of versatility, they are far less than infrared moisture meters.

Scope of application: It can measure food-related articles such as cereals, starch, flour, dried noodles, brewed goods, seafood, fish processed products, processed meat products, seasonings, noodles, hearts, dairy products, dried foods, vegetable oils, etc. , ore sand, coke, glass raw materials, cement, chemical fertilizers, paper, pulp, cotton, all kinds of fiber and other industrial products.

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