Interpretation of the principle of meltblown cloth filter tester

The automatic filter material detector can quickly and accurately measure the filtration efficiency of filter protection equipment and materials. Salt aerosol or oil aerosol can be used as the test carrier, which meets the requirements of the NIOSH standard of the US Occupational Safety and Health Administration. The automatic filter material tester adopts advanced technology and microprocessor control, and is designed with a good user interface and setting mode, which can simplify training and operation. The test result is directly displayed, which is intuitive and convenient. Filter material testing machine (G506); Aerosol type: sodium chloride; median diameter of particle number: 0.075 μm; geometric standard deviation of particle distribution ≤ 1.86; concentration measurement range: 1.0～200 mg/m3; flow range: 15～ 100 L/min; efficiency measurement range: 0%～99.999%; low temperature and humidity control test chamber (SETH-100L); temperature range: -40～+150 ℃; temperature fluctuation ≤0.5 ℃; humidity range: 0～ 99% RH; humidity fluctuation ≤1.0% RH. Filtration efficiency BFE detector (ZR-1000); filtration efficiency for particles above 0.3 μm≥99.99%; mass median diameter of aerosol generator: 3.0 μm; geometric standard deviation ≤1.5; peristaltic pump flow rate: 0.006～3.0 ml/ min. Pressure difference test device (Qingdao Zhongrui); Flow rate: 85L/min. Test principle Oil mist method: Dry and oil-free compressed air enters the aerosol generator at a certain flow rate to produce aerosol with a certain particle distribution, which is screened by a cascade impactor, and particles with a particle size distribution meeting the standard requirements are discharged from the aerosol outlet , Into the test pipeline. And to the filter material, there are differential pressure sensors installed on both sides of the filter material, and the number of particles in the upstream and downstream of the filter material is monitored during the test; the whole test process is carried out with a certain flow or air volume. Salt spray method: Dry and oil-free compressed air enters the aerosol generator at a certain flow rate to produce aerosol with a certain particle distribution, which is screened by the cascade impactor, and the particles with the particle size distribution meeting the standard requirements are discharged from the aerosol outlet and enters Test the pipeline. Since the salt spray aerosol generates static electricity, it is necessary to neutralize the salt spray aerosol. And for salt spray aerosol, it needs to be heated to produce salt particles. The method is: the aerosol that meets the particle size requirements is mixed with heated gas, and then the water in the aerosol is evaporated to produce salt particles. And to the filter material, there are differential pressure sensors installed on both sides of the filter material, and the number of particles in the upstream and downstream of the filter material is monitored during the test; the whole test process is carried out with a certain flow or air volume.

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