The filter performance tester of mask can quickly obtain the evaluation parameters of filter materials and accurately evaluate the quality, performance and life of filter materials.
Product details:
Mask filter performance tester-G507 high efficiency filter material filter performance tester;
The brand-new G507 high-efficiency filter material filtration performance tester adopts the current international mainstream particle counting method, and the high-efficiency and large-flow laser particle counter scans and tests the entire air outlet surface of the filter, thus giving the basic filtration performance of HEPA/ULPA filter material, such as filtration efficiency, particle transmittance, most easily penetrated particle size (MPPS), and also testing the dust removal ability of the filter material. Combined with the life test module, the periodic test of filter media in colleges and universities can be realized, so as to obtain dynamic filtration performance.
Filtration efficiency tester for meltblown cloth
Scope of application:
Suitable for testing professional filter materials.
The filter performance tester of high efficiency filter materials is designed to evaluate the filtration efficiency, MPPS, static and dynamic dust removal efficiency and service life judgment of HEPA and ULPA. By simulating the real situation of filter materials in actual use, the performance evaluation parameters of filter materials can be quickly obtained, and the quality, performance and service life of filter materials can be accurately evaluated.
It provides data basis for the research and development of new filter materials, product quality control and material performance verification, and is the best choice in scientific research, testing, industrial production and other fields.
Reference standard:
(1) Taj1001-2015pm2.5 protective mask
(2)GB2626-2006 Respiratory protective articles-Self-priming filter type anti-particulate respirator
(3)US42CFR84 high efficiency air filters (HEPA and ULPA). Aerosol products, measuring equipment and particle counting statistics.
(4)HEPA and ULPA EN 143 high efficiency air filters. Test flat filter media.
(5)HEPA and ULPA EN 1822.5 high efficiency air filters. Efficiency measurement of filter elements.
(6)ISO29463 high-efficiency filters and filter media are used to remove particles in the air.
Development of high-efficiency filtration materials and testing methods of filtration performance;
HEPA (High Efficiency Air Filter) is a kind of high efficiency air filter, which meets the HEPA standard. The filtration efficiency of HEPA for dust or particles of 0. 1 micron and 0.3 micron is 99.998%. The characteristic of HEPA is that air can pass through, but fine particles can't.
As early as 1940s, the original HEPA filter was designed for Manhattan Project to prevent the spread of radioactive pollutants in the air.
In 1950s, HPEA was commercialized and became a registered trademark, commonly known as high efficiency filter.
After decades of development and changes, and people's requirements for air quality are increasing year by year, the application fields and industries of high-efficiency filters are gradually expanding, and more and more high-tech industries related to people's livelihood safety, such as aerospace, pharmaceutical processing, pharmaceutical workshops, hospitals, medical care, nuclear fuel, nuclear energy, and electronic (computer chip) production, have attracted attention.
Sodium flame method: originated in Britain, and was implemented in some European countries in the 1970s and 1990s. It is one of the current national standard methods in China. The test dust source is multi-dispersed phase sodium chloride salt spray, and the "quantity" is the brightness of hydrogen flame during salt spray combustion. Salt water splashed under the agitation of compressed air and dried to form tiny salt crystal particles, which entered the air duct. Take samples before and after the filter. Salt spray samples make the color of hydrogen flame blue and the brightness increase. The salt spray concentration in the air is judged by the brightness of the flame, so as to determine the filtering efficiency of the filter for salt spray. The main detection instrument is flame photometer. The relevant standards of sodium flame method are: British BS3928- 1969, European Eurovent4/4 and China GB6 165-85. This method can only detect filter materials with low sensitivity, but can't detect ultra-HEPA high-efficiency filters.
Oil mist method:
The oil mist method originated in Germany, and was also practiced in China and the former Soviet Union. The test dust source is oil mist, and the "quantity" is the turbidity of oil mist air. The filtering efficiency of the filter for oil mist particles is judged by the turbidity difference of gas samples before and after the filter. Germany stipulates the use of paraffin oil, and the particle size of oil mist is 0.3~0.5? M China standard stipulates that the average weight diameter of oil mist is 0.28~0.34? M, the type of oil is not specified. The relevant standards are: China GB6 165-85 and German DIN24 184- 1990. When detecting the filter element by oil mist method, it is easy to damage the filter element, and it is impossible to read the value directly, which wastes time.
DOP method:
DOP method 1956 originated in the United States and has been adopted by many countries and Chinese national standards. This method was once the most commonly used method to test HEPA high efficiency filter in the world. Using 0.3μm monodisperse dioctyl phthalate (DOP) droplets, the filtration efficiency of the filter for 0.3μm dust was judged by measuring the turbidity of gas samples before and after the filter. The measuring instrument is mainly light scattering photometer. Relevant standards are: MIL-STD-282- 1956.
Fluorescence method:
Fluorescence method is only used in France, and the test dust source of fluorescence method is sodium fluorescein dust produced by sprayer. The test method is to take samples before and after the filter, and measure the fluorescence brightness of the aqueous solution containing fluorescein sodium under specific conditions. The brightness reflects the weight of dust, so as to calculate the filtration efficiency of the filter. France has long used the counting method of the European Association for Standardization, not the fluorescence method. At present, some nuclear industry systems also use fluorescence method for on-site detection and filtration.
Particle counting method:
It is the mainstream test method in the world at present. The dust source is polydisperse droplets or solid dust with a certain particle size. Sometimes atmospheric dust or other specific dust is used according to the special requirements of users. If the condensation core counter is used in the test, a single dispersed phase with known particle size must be used to test the dust source The main measuring instrument is a high-flow laser particle counter or a condensed nucleus counter (CNC). Through the counter, the whole air outlet surface of the filter is scanned and tested, and the dust quantity of each point is given, and the local efficiency of each point can also be compared. The relevant standards of this method are: EN 1882 in Europe and IE-RP-CC 007 in the United States.1-1992.
Principle of the filter performance tester for high efficiency filter materials;
Test dust or particles are dispersed by compressed air in the dust generator to form a pipeline with uniform concentration, and dust particles with a certain monodisperse value are formed through the action of electrostatic classifier and charge neutralizer. The other side of the tested filter material generates a certain suction airflow under the action of the suction pump, which sucks away the dust on the tested filter material, thus simulating the operation of the tested filter material under constant airflow and dust concentration. By monitoring the concentration and particle size distribution of dust or particles on both sides of the tested filter material, the filtration efficiency and dust transmittance of the tested filter material can be quickly obtained.
The accumulation of dust or particles on the surface and inside of the high efficiency filter material will lead to the increase of test pressure drop, and the pressure difference sensor will detect the pressure drop change before and after the tested filter material in real time. The filtration mode of high efficiency filter determines that the increase of filtration energy consumption caused by dust accumulation will reduce the filtration material, and the internal damage of the filtration material caused by particle impact will increase the transmittance and reduce the filtration efficiency. By monitoring the filtration efficiency-particle size distribution-pressure drop curve, the service life of the tested sample can be pre-evaluated. Particle size spectrometer can be used not only to monitor dust concentration, but also to test particle size distribution, evaluate the static dust removal efficiency of materials in a certain period of time, and the dynamic dust removal efficiency of filter materials in the whole service cycle with the change of working conditions.
The configuration of the bottom dust collector makes the dust not disperse to the upstream of the dirty air of the tested filter material, which leads to unclear dust concentration and invalid measurement (especially the important parameter: residual pressure drop value); This design realizes error-free long-term operation and does not need to completely interrupt the measurement because of cleaning up the accumulated dust.