A. Principle:
Scattering photometer,
analyze and detect the concentration ratio of the oily aerosol before and after
the filter material, calculate the penetration rate and filtration efficiency.
Using the scattering photometer to measure the concentration of paraffin oil
aerosol according to the latest international standard EN 149.
B. Scope of Application
It is used to test the
particulates filtration efficiency of daily face masks and filter materials.
C. Applicable Standards:
GB 2626-2019: Respiratory
protection—Non-powered air-purifying particle respirator
GB/T 32610-2016: Technical
specification of daily protective mask
GB/T19083-2010: Technical
requirements 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 0.6
microns
2. Flow Range: (20～100) L/min, accuracy 2%
3. Filtration Efficiency: (0.001～99.999)%
4. Resistance: 0～1000Pa, accuracy 2%
5.
Test Area: 100cm² or customized fixture
6.
Aerosol: oil (paraffin oil)
7. Aerosol Concentration: (0.1～200) mg/m³ (oily)
8.
Test Mode: filtration efficiency based on the different load
of 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, 198
std. L/min
E、 System Composition
1、Aerosol
Equipped with a set of the independent
aerosol generator; oily particulate generator
2、Air-Flow
Consists of a vacuum pump, air-flow controller, mass flow
transmitter, differential pressure transmitter, and air pipe.
3、Photometer
Using the 90-degree right
angle light scattering principle, the built-in air pump is used to draw aerosol
particles into the optical chamber, and the mass concentration of the particles
is measured by the amount of light scattered. Dynamic measurement range: can measure
the mass density of ions below 1.0 microns, below 2.5 microns, below 4.0
microns, and below 10.0 microns. Detection range: 0.001~400mg/m³.
The photometer at the front
of the filter material sample measures the mass concentration at the front; the
photometer at the back of the filter material sample measures the mass
concentration of the particles at the back. The ratio of the mass concentration
at the front and back is used to calculate the filtration efficiency of the
filter material sample.
4、Control System
PLC control measures airflow
and pressure difference before and after filtration.
Calculate the particle
concentration filtration efficiency and mass concentration filtration
efficiency of different particle sizes when the loading capacity is in the
range of 30mg-400mg.
Print out measurement output:
( loading capacity can be set as: 1mg----30mg----400mg)
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Rate
Differential Pressure
Aerosol
Particles 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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