The Bacterial Filtration Efficiency (BFE) detector is a specialized instrument designed to test the ability of samples such as masks to filter out bacterial particles under specified conditions. This instrument primarily references YY0469-2011 "Technical Requirements for Medical Surgical Masks" Appendix B "Bacterial Filtration Efficiency (BFE) Test Method" and incorporates innovative improvements using dual gas paths for simultaneous sampling comparison, significantly enhancing sampling accuracy.

This instrument is suitable for metrological verification departments, third-party testing laboratories, textile industry applications, and fiber raw material industries.

• Negative pressure and closed experimental environment ensuring operator safety
• Dual six-level Andersen sampler for simultaneous sampling
• Built-in peristaltic pump in sampling chamber with adjustable flow rate
• High-performance gas atomizer with settable flow rate
• Special microbial aerosol generator with excellent atomization effect
• Embedded high-speed industrial microcomputer control system
• 10.4-inch industrial-grade high-brightness color touch screen
• USB interface supporting U disk data transfer
• Real-time data printing capability (V1.06 and later models)
• Built-in high-brightness lighting and sterilization UV lamps
• Front switch glass door for easy observation and operation
• Built-in leakage protection switch for instrument and operator safety
• Stainless steel inner cabinet with spray-coated cold-rolled sheet outer layer
• Thermal insulation and flame retardant material between layers
• Detachable bracket with dual-purpose supporting and moving casters

• Class I: >7μm
• Grade II: 4.7 to 7μm
• Grade III: 3.3～4.7μm
• Grade IV: 2.1 to 3.3μm
• Grade V: 1.1～2.1μm
• Grade VI: 0.6～1.1μm

• Aerosol Chamber: 600×85×3mm (Length×Diameter×Thickness)
• Total Positive Control Sampler Particles: (2200±500) CFU
• Negative Pressure Cabinet Ventilation Flow: ≥5m³/min
• Negative Pressure Cabinet Door Size: 1000×730mm (L×W)
• Host Size: 1400×750×2300mm (L×W×H)
• Working Power: AC220V±10%, 50Hz
• Instrument Noise: <65dB(A)
• Total Weight: Approximately 350kg
• Machine Power Consumption: <1500W

Bacterial Filtration Efficiency (BFE): Under specified conditions, the efficiency of the tested sample to filter out bacteria-containing particles, expressed as a percentage.

Tested Samples: Masks, textiles, fiber raw materials, and other physical barriers that prevent the direct penetration of pathogenic microorganisms, body fluids, particulate matter, etc.

A controlled concentration of bacterial aerosol is generated upstream of the test sample. After entering the aerosol chamber and mixing evenly, the bacterial aerosol flows into two parallel gas path sampling systems. One path includes the test sample at the sampler's upper end, while the other serves as a positive control without the sample. By calculating the ratio between the positive control value and the sample test value as the leak rate, the filtration efficiency is determined.

• YY0469-2011 Appendix B Bacterial Filtration Efficiency (BFE) Test Method Section B.1.1.1 Test Apparatus
• YY/T 0969-2013 Disposable Medical Masks
• GB19083 Standard