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What are the filtration standards for high-efficiency filters
What are the filtration standards for high-efficiency filtersHigh-efficiency filters are mainly used to collect particles above 0.5um and all kinds of suspended matter and are used as the end filters of various filtration systems. The filter material is made of ultra-fine glass fiber paper, rubber sheet paper, aluminum foil sheet, and other materials folded into a partition, completely sealed with a new type of company polyurethane for sealant, and the outer frame is made of galvanized plate, stainless steel plate, aluminum alloy structural profile technology. Bacclean will tell you about the filtration standard of high-efficiency filter as follows:1、Count scanning method At present, the mainstream international experimental research methods use high-efficiency filters. Mainly can be carried out by measuring data analysis instruments for high-flow laser particle counter or condensation counter. Use the counter to scan and check the entire air surface of the filter, the counter gives the number and size of each dust point. This method of educational and pedagogical research not only improves the average efficiency of the student's work in measuring the filter but also carries out the development of the situation by comparing the efficiency of local learning at each point. The counting and scanning method is the most rigorous method of testing the system hePA filter. It is a big trend to replace various cultural and traditional educational methods of other enterprises with this method. 2, photometric scanning Dust sources are usually polydisperse phase droplets, such as Laskin nozzles can produce DOP fumes. A photometer is used to scan the entire plane of the filter for leak detection. This scanning method can quickly and accurately detect filter leaks. Since the dust source is polydisperse and the photometer cannot determine the dust particle size, there is little practical value in giving a "filter efficiency" using this scanning method. Some manufacturers and users believe that filter efficiency can be determined by strictly controlling the quality and specification of the filter paper. Therefore, only scanning for leakage detection can ensure the quality of HEPA filters. The photometric scanning leakage detection method for high-efficiency filters has not been given a corresponding standard, but the method is very effective for quality management control in the production and development process, and the testing technology and equipment are relatively simple. |
