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.

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.