Scope of application:
The mask filtration performance tester quickly obtains the evaluation parameters of the use performance of the filter material, and accurately evaluates the quality, performance and life of the filter material.
Product details:
Mask Filtration Performance Tester-G507 High Efficiency Filter Material Filtration Performance Tester:
The brand-new G507 High Efficiency Filter Material Filtration Performance Tester adopts the international mainstream particle counting method, and the high-efficiency high-flow laser particle counter scans and examines the whole air outlet surface of the filter, so as to give the filtering efficiency of HEPA/ULPA filter material. ULPA filter material filtration efficiency, particle permeability, the most penetrable particle size (MPPS) and other basic filtration performance of high efficiency filtration materials, but also to test the dust removal capacity of the filter material, combined with the life test module can be realized on the college filtration material cycle test, in order to obtain the dynamic filtration performance of the filtration material as well as the effective filtration life situation.
Meltblown Fabric Filtration Efficiency Tester
Scope of application:
Suitable for professional filter media testing
High efficiency filtration material filtration performance tester is designed for evaluating the filtration efficiency of HEPA and ULPA, MPPS, static and dynamic dust removal efficiency, and determining the service life of the media, etc. It quickly obtains the performance of the filtration materials by simulating the real situation of the filter media in the process of actual use. By simulating the real situation of the filter media in the actual use process, it can quickly obtain the evaluation parameters of the use performance of the filter media and accurately evaluate the quality, performance and life of the filter material.
It provides data basis for the research and development of new filter materials, product quality control, material performance verification, etc. It is the best choice for scientific research, testing, industrial production and other fields.
Reference standards:
(1) TAJ1001-2015 PM2.5 protective mask
(2) GB2626-2006 respiratory protective equipment self-priming filtering anti-particulate respirator
(3) US42CFR84 high efficiency air filters (HEPA and ULPA). Aerosol products, measuring equipment, particle counting statistics
(4) EN143 High efficiency air filters (HEPA and ULPA). Testing of flat sheet filtration media
(5) EN1822.5 High efficiency air filters (HEPA and ULPA). Determination of the efficiency of the filter element
(6) ISO29463 removal of airborne particles in high-efficiency filters and filtration media
High-efficiency filtration materials and filter performance test method development:
HEPA (HighefficiencyparticulateairFilter), that is, the high-efficiency air Filter, to achieve the HEPA standard filter, for 0.1 micron and 0.3 micron dust or particles filtering efficiency of 99.998%, HEPA mesh is characterized by the air can pass, but fine particles can not pass.
As early as the 1940s, the original HEPA filters were designed to prevent the spread of airborne radioactive contaminants in the Manhattan Project.
In the 1950s, HPEA was commercialized and became a registered trademark, commonly called a high efficiency filter.
After decades of development and change as well as people's requirements for air quality improve year by year, the field of application of high-efficiency filters and applicable industries gradually expand, in more and more high-tech, related to people's livelihood and safety and other industrial areas of concern, such as aerospace, dispensing processing, pharmaceutical workshops, hospitals, health care, nuclear fuel, nuclear energy and electronics (computer chip) production.
Sodium flame method: originated in the UK and practiced in some European countries in the 1970s to 1990s, it is one of the current national standard methods in China. Its test dust source for the polydisperse phase sodium chloride salt spray, "amount" for the brightness of the hydrogen flame containing salt spray combustion. Salt water in the compressed air under the stirring splash, by drying the formation of tiny salt crystal particles and enter the duct, before and after the filter were sampled, containing salt spray samples to make the color of the hydrogen flame blue, brightness increased to the brightness of the flame to determine the concentration of salt spray in the air, and in this way to determine the filter efficiency of the filter on the salt spray, the main testing instrument for the flame photometer. Sodium flame method of the relevant standards are: British BS3928-1969, Europe Eurovent4/4, China GB6165-85. The method can only detect the sensitivity of the filter material is not high, can not be super HEPA high-efficiency filter detection.
Oil mist method:
The oil mist method originated in Germany, and is also practiced in China and the former Soviet Union. Test dust source for oil mist, "amount" for the turbidity of the air containing oil mist to filter the turbidity difference between the air samples before and after the filter to determine the filter efficiency of the oil mist particles. Germany provides for the use of paraffin oil, oil mist particle size of 0.3 ~ 0.5?m. China's standards provide for the average weight of the oil mist diameter of 0.28 ~ 0.34?m, the type of oil did not make specific provisions. Relevant standards are: China GB6165-85, Germany DIN24184-1990. oil mist method in the detection of the filter, easy to damage the filter, and can not directly read the value, waste of time.
DOP method:
DOP method originated in the United States in 1956, has been adopted by many countries, China's national standards have also been adopted, this method used to be the most commonly used method to test HEPA high-efficiency filters internationally. Using 0.3μm monodisperse phase dioctyl phthalate (DOP) droplets, by measuring the turbidity of the gas sample before and after the filter, and from this to determine the filter efficiency of the filter on 0.3μm dust. The measuring instrument is mainly a photometer. Relevant standards are: MIL-STD-282-1956.
Fluorescence method:
Fluorescence method is only used in France, fluorescence method of the test dust source for the aerosolizer produced by sodium fluorescein dust. The test method is first sampled before and after the filter, measuring the fluorescence of sodium fluorescein-containing aqueous solution in specific conditions of fluorescence brightness, the brightness of the response to the weight of the dust, which calculates the filter's filtration efficiency. France has long been without fluorescence method, and the use of the European Association for Standardization counts, some of the current nuclear industry system on-site testing of filters also use fluorescence method.
Particle counting method:
It is the mainstream international test method. Dust sources are polydisperse phase droplets, or solid dust with a defined particle size. Sometimes atmospheric dust or other specific dusts are used according to the user's special requirements. If a condensation counter is used in the test, a monodisperse test dust source with a known particle size must be used. The main measuring instruments are high-flow laser particle counters or condensation counters (CNC). The entire air outlet surface of the filter is scanned with the counter, which gives the number of dusts at each point and also compares the local efficiency at each point. The method of the relevant standards are: Europe EN1882, the United States IES-RP-CC007.1-1992
High-efficiency filtration material filtration performance tester principle:
Test dust or particles in the dust collector with the dispersion of compressed air to form a consistent concentration of the average distribution of the pipeline, through the role of electrostatic classifiers and charge neutralizers, the formation of a certain mono-dispersed value of the dust particles, the subject of the filtration of the particles, the test filter is a single dispersed value of the dust particles. Dust particles, subject to the other side of the filter media through the suction pump to produce a certain suction airflow will be traction on the test filter media above, so as to simulate the operation of the test filter media in a constant airflow and dust concentration. By monitoring the dust or particle concentration and size distribution on both sides of the test filter material, the filtration efficiency of the test filter material and the dust penetration rate can be quickly determined.
The concentration of dust or particles on the surface and inside the high-efficiency filtration material will lead to an increase in the test pressure drop, and the differential pressure sensor detects the change of pressure drop before and after the test filter material in real time. The filtration mode of high efficiency filters determines that the filter material should be subjected to the filtration efficiency decrease caused by the increase of filtration energy consumption due to the internal accumulation of dust, and the penetration rate increase and filtration efficiency decrease caused by the internal damage of the filter material due to the impact of particles. By monitoring the filtration efficiency-particle size distribution-pressure drop change curve, we can realize the pre-evaluation of the service life of the sample to be tried. The particle size spectrometer monitors the dust concentration and also tests the particle size distribution of the dust, evaluating the static dust removal efficiency of the material over time as well as the dynamic dust removal efficiency of the filter material as it changes with the operating conditions over the entire service life.
A bottom dust collector is provided so that dust is not redispersed upstream of the dirty air in the test media, leading to ambiguous dust concentrations that would invalidate the measurement (especially for the important parameter: residual pressure drop); this design allows for error-free, long-term operation, with no need for frequent and complete interruptions of measurements due to cleaning of dust deposits.