Bacterial filtration efficiency detector
1. Overview
Bacterial filtration efficiency (BFE) detector is a special
instrument to detect the ability of filter particulate matter from
tested samples (such as masks) under specified conditions.
This instrument mainly refers to Technical Requirements for Medical
Surgical Mask in YY0469-2011, Appendix B < Bacterial Filtering
Efficiency (BFE) Test Method B.1.1. Use the simultaneous sampling
and comparison method to improve the accuracy of sampling.
This instrument is applicable to measurement verification
department, third-party testing, textile industry and fiber raw
material industry, etc.
2. Instrument Features
- Negative pressure and closed experimental environment to ensure the
safety of operators;
- Two six-stage Andersen sampler for sampling simultaneously;
- The squirtic pump is built in the sampling warehouse, and the flow
size of the squirm pump can be set;
- High-performance gas atomizer, the flow size can be set;
- Special microbial aerosol generator, with good atomization effect;
- Embedded high-speed industrial microcomputer control;
- A 10.4-inch industrial-grade high-brightness color touch display;
- USB interface, supports the use of U disk for data transfer
storage;
- Support real-time data printing (V1.06 and subsequent models only);
- High-brightness lighting lamp and sterilization ultraviolet lamp
are placed in the cabinet body;
- Front switch glass door for experimenter to observe operation;
- Built-in leakage protection switch to protect the safety of
instruments and operators;
- Cabinet interior layer of stainless steel overall processing and
molding, outer spray plastic cold rolled board;
- The materials between the internal and outer layers have thermal
insulation and flame retardant properties;
- Removable support, support and moving casters.
Main technical indicators of 3.
| Main parameters | Parameter range | Resolution | Maximum allowable error |
| Left-side sampling flow | 28.3L/min | 0.1L/min | Better than ± by 2.5% |
| Right-way sampling flow | 28.3L/min | 0.1L/min | Better than ± by 2.5% |
| Spray flow rate | (8~10) L/min | 0.1L/min | Better than ± by 5.0% |
| Crecretic pump flow | (0.01~3.0) mL/min | 0.001ml/min | Better than ± by 2.5% |
| Operating temperature | (5～30)℃ |
| Data storage capabilities | > 100000 Group |
| High-efficiency air filter characteristics | Filtering efficiency for particles above 9.3 μm ≥ 99.99% |
| Medium value diameter of aerosol generator | Average Particle Diameter (3.0 ± 0.3) μm, Geometry Standard
difference ≤ 1.5 |
Dual Way Class 6 Anderson Sampler Capture particle size (in μm) | Grade:> 7; Grade: 4.7~7 Level: 3.3~4.7 Level: 2.1~3.3 Level: 1.1~2.1 Level: 0.6~1.1 |
| Foroom specifications | (600 × 85 × 3) mm,(long × Diameter × thick) |
| Total number of positive QC sampler particles | (2200 ± 500) CFU |
| Ventilation flow of negative pressure cabinet | ≥ 5m3/ min |
| Negative pressure cabinet door size | (1000 × 730) mm,(long × wide) |
| Host size | (1400 × 750 × 2300) mm,(long × wide × H) |
| Working power supply | AC220V ± 10%, 50Hz |
| Instrument noise | <65dB (A) |
| Operating Machine Weight | About 350kg s |
| Complete power consumption | <1500W |
4. -related terms
Ø Bacterial filtration efficiency (BFE): The efficiency of the
measured sample for bacterial particulate matter filtration is
indicated in percent.
Ø Samples tested: masks, textiles and fiber raw materials are a
physical barrier to prevent the direct passage of pathogen
microorganisms, body fluids, particles, etc.
How the 5. works
After a certain concentration of bacterial aerosol occurs in the
upstream of the tested sample, the bacterial aerosol enters two
parallel airway sampling systems, where one way adds test samples
at the upper end of the sampler, the other, as the positive quality
control, and the ratio between the count positive QC value and the
value of the sample to be the leakage rate, the filtration
efficiency is obtained.
6. Reference Standards
- Appendix YY0469-2011 B Bacterial Filtering Efficiency (BFE) Test
Methods — B.1.1. 1. Test instrument;
- YY/T 0969-2013 disposable medical masks;
GB19083 Standard.
