医疗面膜亚微米颗粒过滤效率PFE测试机 /仪器 /设备 /设备 /设备
Related terms:
过滤效率：在指定的检测条件下滤波器元件去除的颗粒物的百分比；
油雾方法检测：使用DEHS / PAO / DSP以及其他油性或等效材料作为气溶胶来检测口罩或过滤材料的过滤性能；
盐喷雾测试：一种用于检测使用NaCl或等效卤化物的口罩或过滤材料的过滤性能的方法；
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.
盐喷雾法：
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.
结构：
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;
盐雾气雾剂加热系统：产生盐颗粒；
静态路线系统：用于中和盐喷雾剂中的静电；
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;
粒子计数器：用于测量过滤器材料上游和下游的颗粒数量；
Flow controller: control and adjust the measured air volume;
其他;
