Mask particle filtration efficiency tester salt spray method and oil mist method test principle

Mask particle filtration efficiency tester can simulate the actual use environment of masks or filter media, filter efficiency testing based on the salt spray and oil mist methods required by the standard, is the test equipment independently developed and produced by Shanghai Qianshi Precision Electromechanical Technology Co.
, Ltd.
, cost-effective, complete
after-sales service.

Reference standards: GB2626-2006, YY0469-2011, EN1822-3:2009 Related concepts: Filtration efficiency: the percentage of particulate matter filtered out by the filter element under specified detection conditions; Salt spray detection: a method of using NaCl or equivalent halide as an aerosol to detect the filtration performance of masks or filter media; Oil mist detection: DEHS/PAO/DSP and other oily or equivalent aerosols to test the filtration performance
of masks or filter media.

Test principle: salt spray method: dry oil-free compressed air into the aerosol generator at a certain flow rate, produce a certain particle distribution of aerosol, through the cascade impactor screening, the particles that meet the standard requirements of particle size distribution are discharged from the aerosol outlet and enter the test pipeline
.

Since the salt spray aerosol is produced with static electricity, the salt spray aerosol needs to be neutralized
.

And for salt spray aerosols, it is necessary to heat them to produce salt particles
.

The method is: the aerosol that meets the particle size requirements is mixed with a heated gas and then the water in the aerosol is evaporated to produce salt particles
.

And to reach the filter media, the filter media on both sides of the installation of differential pressure sensors, the test process of the upstream and downstream particles of the filter media particles monitoring, the entire test process with a certain flow rate or air volume
.

Oil mist method: dry oil mist compressed air into the aerosol generator at a certain flow rate, produce a certain particle distribution of aerosols, through cascade impactor screening, the particles that meet the standard requirements of particle size distribution are discharged from the aerosol outlet and enter the test pipeline
.

And to reach the filter media, the filter media on both sides of the installation of differential pressure sensors, the test process of the upstream and downstream particles of the filter media particles monitoring, the entire test process with a certain flow rate or air volume
.