What are the parameters of the meltblown cloth bacterial filtration efficiency (BFE) tester

Applicable standards:

　　 YY0469-2011 "Technical Requirements for Medical Surgical Masks" Appendix B Bacterial Filtration Efficiency (BFE) Test Method Section B.1.1.1

　　Q/0212 ZRB003-2011 Bacteria filtration efficiency of medical surgical masks

　　ASTMF2100, ASTMF2101, European EN14683

The main parameters:

　　1. Sampling flow rate of channel A: parameter range, 28.3L/min; resolution, 0.1L/min; allowable error: better than ±2.5%;

　　 Channel B sampling flow: parameter range, 28.3L/min; resolution, 0.1L/min; allowable error: better than ±2.5%;

　　2. Spray flow rate: parameter range, (8～10)L/min; resolution, 0.1L/min; allowable error: better than ±5.0%;

　　3. Peristaltic pump flow: parameter range, (0.006～3.0)mL/min; resolution, 0.001ml/min; allowable error: better than ±2.5%;

　　4. Pressure in front of the A-channel flowmeter: parameter range, (-20～0)kPa; resolution, 0.01kPa; allowable error: better than ±2.5%;

　　The pressure before the B-channel flowmeter: parameter range, (-20～0)kPa; resolution, 0.01kPa; allowable error: better than ±2.5%;

　　5. Pressure before spray flowmeter: parameter range, (0～300)kPa; resolution, 0.1kPa; allowable error: better than ±2.5%;

　　6. ​​Negative pressure of the aerosol chamber: parameter range, (-90～-120)Pa; resolution, 0.1Pa; allowable error: better than ±2.0%;

　　7. Data storage capacity: >100,000 groups;

　　 8. High-efficiency air filter characteristics: filtration efficiency for particles above 0.3um is ≥99.99%;

　　 9. Mass median diameter of aerosol generator: average particle diameter (3.0 ± 0.3) μm, geometric standard deviation ≤ 1.5.

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