Interpretation of the principle of meltblown cloth filter tester1

The automatic filter material detector can quickly and accurately measure the filtration efficiency of filtration protective equipment and materials. Salt aerosol or oily 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 tester adopts advanced technology and microprocessor control. It is designed with a good user interface and setting method, which can simplify training and operation. The test results are displayed directly, which is intuitive and convenient. Filter material testing machine (G506); Aerosol Type: Sodium Chloride; Particle Number Median Diameter: 0.075μm; particle distribution geometric standard deviation≤1.86; Concentration measurement range: 1.0～200 mg/m3; Flow range: 15～100 L/min; Efficiency measurement range: 0%～99.999%; Low temperature temperature and humidity control test box (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); to 0.3μFiltration efficiency of particles above m≥99.99%; aerosol generator mass median diameter: 3.0μm; geometric standard deviation≤1.5; Peristaltic pump flow: 0.006 to 3.0 ml/min. Pressure difference test device (Qingdao Zhongrui); flow rate: 85L/min. Test principle Oil mist method: dry oil-free compressed air enters the aerosol generator at a certain flow rate to generate aerosol with a certain particle distribution, which is screened by a cascade impactor, and the particles with a particle size distribution that meet the standard requirements are discharged from the aerosol outlet. , into the test pipeline. And reach the filter material. Differential pressure sensors are installed on both sides of the filter material. During the test process, the number of particles in the upstream and downstream of the filter material is monitored; the entire test process is carried out with a certain flow or air volume. Salt spray method: Dry oil-free compressed air enters the aerosol generator at a certain flow rate to generate aerosol with a certain particle distribution, and is sieved by a cascade impactor, and the particles with a particle size distribution that meet the standard requirements are discharged from the aerosol outlet and enter Test the pipeline. Due to the static electricity generated by the salt spray aerosol, it is necessary to neutralize the salt spray aerosol. And for salt mist aerosol, it needs to be heated to generate salt particles. The method is as follows: mixing the aerosol that meets the particle size requirements with heating gas, and then the water in the aerosol is evaporated to generate salt particles. And reach the filter material. Differential pressure sensors are installed on both sides of the filter material. During the test process, the number of particles in the upstream and downstream of the filter material is monitored; the entire test process is carried out with a certain flow or air volume.

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