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.    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 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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