A. Principle:
Scattering photometer,analyze and detect the concentration ratio of the oily aerosol before and afterthe filter material, calculate the penetration rate and filtration efficiency.Using the scattering photometer to measure the concentration of paraffin oilaerosol according to the latest international standard EN 149.
B. Scope of Application
It is used to test theparticulates filtration efficiency of daily face masks and filter materials.
C. Applicable Standards:
GB 2626-2019: Respiratoryprotection—Non-powered air-purifying particle respirator
GB/T 32610-2016: Technicalspecification of daily protective mask
GB/T19083-2010: Technicalrequirements for protective face mask for medical use
YY0469-2011: Surgical mask
EN 149-2019
BSEN13274-7:2019
D. Technical Parameters
1. Particle Diameter: mass concentration median diameter of 0.6microns
2.
3.
4.
5. Test Area: 100cm2 or customized fixture
6. Aerosol: oil (paraffin oil)
7.
8. Test Mode: filtration efficiency based on the different loadof aerosol
9. Test Temperature: (25±5)℃
10. Relative Humidity: (30±10)%
11. Dimensions: 1600*600*2300(mm)
12. Weight: 90kg
13. Power Supply: AC220V 50Hz
14. Compressed Air: 550kPa, 198std. L/min
E、 System Composition
1、Aerosol
Equipped with a set of the independentaerosol generator; oily particulate generator
2、Air-Flow
Consists of a vacuum pump, air-flow controller, mass flowtransmitter, differential pressure transmitter, and air pipe.
3、Photometer
Using the 90-degree rightangle light scattering principle, the built-in air pump is used to draw aerosolparticles into the optical chamber, and the mass concentration of the particlesis measured by the amount of light scattered. Dynamic measurement range: can measurethe mass density of ions below 1.0 microns, below 2.5 microns, below 4.0microns, and below 10.0 microns. Detection range: 0.001~400mg/m3.
The photometer at the frontof the filter material sample measures the mass concentration at the front; thephotometer at the back of the filter material sample measures the massconcentration of the particles at the back. The ratio of the mass concentrationat the front and back is used to calculate the filtration efficiency of thefilter material sample.
4、Control System
PLC control measures airflowａnd pressure difference before and after filtration.
Calculate the particleconcentration filtration efficiency and mass concentration filtrationefficiency of different particle sizes when the loading capacity is in therange of 30mg-400mg.
Print out measurement output:( loading capacity can be set as: 1mg----30mg----400mg)
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Rate
Differential Pressure
AerosolParticles C
Loading Capacity(mg) Filtration Efficiency %
1.0 97
5.0 96
10. 96
30 92
100 71
200 62
400 35
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