Medical Mask Submicron Particulate Filtration Efficiency PFE Test Machine / Instrument / Equipment / Device / Apparatus
Related terms:
Filtration efficiency: the percentage of particulate matter removed by the filter element under the specified detection conditions;
Oil mist method detection: use DEHS / PAO / DSP and other oily or equivalent materials as aerosols to detect the filtering performance of masks or filter materials;
Salt spray test: a method for detecting the filtering performance of masks or filter materials with NaCl or equivalent halide as an aerosol;
Testing Principle:
Oil mist method:
The dry oil-free compressed air enters the aerosol generator at a certain flow rate to produce aerosols with a certain particle size distribution. After being sieved by a cascade impactor, the particles with a particle size distribution that meets the standard requirements are discharged from the aerosol outlet and enter the test pipeline.It reaches the filter material. Different pressure sensors are installed on both sides of the filter material. During the test, the number of particles upstream and downstream of the filter material is monitored; the entire test process is carried out with a certain flow rate or air volume.
Salt spray method:
The dry oil-free compressed air enters the aerosol generator at a certain flow rate to produce aerosols with a certain particle size distribution. After being sieved by a cascade impactor, the particles with a particle size distribution that meets the standard requirements are discharged from the aerosol outlet and enter the test pipeline.Because the salt mist aerosol is charged with static electricity, the salt mist aerosol needs to be neutralized. And for the salt mist aerosol, it needs to be heated to produce salt particles. The method is: mixing the aerosol that meets the particle size requirements with the heating gas, and then the water in the aerosol is evaporated to produce salt particles.It reaches the filter material. Different pressure sensors are installed on both sides of the filter material. During the test, the number of particles upstream and downstream of the filter material is monitored; the entire test process is carried out with a certain flow rate or air volume.
Structure:
The structure of the instrument is shown below:
Including:Spray pumps, electrostatic neutralizers, cylinders, flow meters, PLC industrial control systems, fans, exhaust gas filtration, flow transmitters, differential pressure sensors, touch screen computers, oil mist aerosol generators, salt mist aerosol generators, etc;
The instrument consists of the following parts:
Salt mist aerosol generating system: can produce salt aerosol that meets the standard particle size distribution requirements;
Oil mist aerosol generation system: can produce oil and gas aerosols that meet the standard particle size distribution instructions;
Salt mist aerosol heating system: produces salt particles;
Static route system: used to neutralize static electricity in salt spray aerosols;
Mixed cavity: mixing heated gas and salt mist aerosol to produce salt particles that meet the requirements;
Aerosol switching system: easy to switch aerosol;
Filtration fixture: used to hold filter material or mask;
Differential pressure sensor: used to measure the differential pressure between upstream and downstream of the filter material;
Particle counter: used to measure the number of particles upstream and downstream of the filter material;
Flow controller: control and adjust the measured air volume;
Others;
