Mask particle filtration tester

brief introduction

The mask automatic filter material tester can simulate the actual use environment of the mask or the filter material, and test the filter efficiency and filter resistance based on the standard oil spray and salt spray methods.

The test parameters meet the requirements of the test methods in NIOSH 42 CFR Part 84 and GB / T 2626 standards.

In addition, the automatic filter material tester can also carry out the filter material permeability test, the test aperture: 1 / 1,1 / 2,1 / 4,1 / 8;

Test materials: layer mask or filter material;

Test method: oil spray method test and salt spray method test;

Test parameters: filtration efficiency, filtration resistance, etc.;

Automatic filter material tester can accurately evaluate the filter performance of masks or filter material, provide data basis for the research and development of new filter materials, product quality control, material performance verification, etc., and is the best choice for product performance verification in the fields of scientific research, testing, industrial production and other fields.

testing standard

⑴ YY0469-2011 "The Medical Surgical Mask"

⑵ GB2626-2006 Self-priming Filter Antiparticulate respirator

⑶ 《 European Standard EN1822-3:2009 Single Filter Material Test

Related terminology

Filtering efficiency: the percentage of particles filtered by the filter elements under the specified detection conditions;

Oil mist detection: using DEHS / PAO / DSP and other oil or equivalents as aerosols to test the filter performance of masks or filter materials;

Salt spray method detection: NaCl or equivalent halide as an aerosol to detect the filter performance of the mask or filter material;

The test principle

Oil fog method:

Dry oil-free compressed air enters the aerosol generator with a certain flow rate, producing certain aerosol distributed particles, and the granular particles meeting the standard requirements are discharged from the aerosol outlet and into the test pipeline.

And reach the filter material, the differential pressure sensor installed on both sides of the filter material upstream and downstream particles particle number monitoring; the whole test process with a certain flow or air volume.

saline fog method:

Dry oil-free compressed air enters the aerosol generator with a certain flow rate, producing certain aerosol distributed particles, and the granular particles meeting the standard requirements are discharged from the aerosol outlet and into the test pipeline.

Because salt mist aerosol produces static electricity, salt mist aerosol needs to be neutralization.And for the salt mist aerosol, it needs to be heated to produce salt particles.The method is: the generated aerosol that meets the particle size requirements is mixed with the heated gas and then the water in the aerosol is evaporated to produce salt particles.

And reach the filter material, the differential pressure sensor installed on both sides of the filter material upstream and downstream particles particle number monitoring; the whole test process with a certain flow or air volume.