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What are the limitations of the ordinary pass box in terms of purification effect?
What are the limitations of the ordinary pass box in terms of purification effect?Ordinary pass box has the following limitations in terms of purification effect:Poor ability to clean non-biological pollutants such as dust Conventional pass boxes rely mainly on ultraviolet light to kill bacteria. The ultraviolet wavelength emitted by the ultraviolet lamp is generally between 200-280 nanometers, and the ultraviolet light in this wavelength range can destroy the DNA structure of microorganisms, to achieve the purpose of sterilization and disinfection. However, for non-biological pollutants such as dust, fibers, and hair, ultraviolet light has no cleaning power. For example, in an ordinary laboratory pass box, if some laboratory equipment is passed in from the outside environment, the dust particles attached to the surface of the equipment will not be removed by ultraviolet radiation. These dust particles may contain various impurities, such as metal particles, pollen, fabric fibers, etc., which can introduce pollution sources in subsequent experimental operations. Incomplete purification Ultraviolet sterilization itself has certain limitations. Its bactericidal effect is affected by a variety of factors, such as the intensity of ultraviolet light, irradiation time, the material, and the shape of the surface of the article. The penetration of ultraviolet light is weak, and for some obscured areas or complex objects, it may not be able to fully illuminate all surfaces. For example, when passing some instruments with gaps or complex structures inside, it is difficult for ultraviolet light to penetrate these areas to kill bacteria. Even on surfaces that ultraviolet light can reach, microorganisms may not be completely killed because they are in the shadow or covered by other substances. In addition, with the increase in the use time of the ultraviolet lamp, its ultraviolet output intensity will gradually decrease. Generally speaking, the service life of the ultraviolet lamp is about 1000-2000 hours, more than this time, the sterilization effect will be greatly reduced, and the ordinary pass box will find be difficult to monitor the change of ultraviolet intensity in real-time, which leads to incomplete purification may often occur. Unable to cope with dynamic pollution sources During the working process of the ordinary transfer window, if new pollutants enter the pass box, for example, in the process of transferring goods, external dust enters the pass box with the airflow, or the transferred goods themselves produce new pollutants (such as some volatile chemicals) during the placing process, Ordinary pass box does not have effective measures to remove these dynamically generated pollutants in a timely manner. In contrast, the air shower pass box can continuously filter and purify the air entering the inside of the pass box through the continuous air shower process, and timely deal with these dynamic pollution sources, while the ordinary pass box can only rely on limited ultraviolet sterilization, and can do nothing about the dynamic pollution sources. |
