The main performance indicators of DRK-1000 mask bacterial filtration efficiency (BFE) detector not only meet the requirements of test instrument B.1.1.1 in Appendix B of "Medical Surgical Mask Technical Requirements" YY0469-2011, B.1.1.1 Test Method of Bacterial Filtration Efficiency (BFE) Test Method, And it also meets the requirements of ASTMF2100, ASTMF2101, European EN14683 standards, and on this basis, innovative improvements have been made. The dual gas path simultaneous sampling method is used to improve the accuracy of sampling. It is suitable for metrological verification departments. , Scientific research institutes, mask manufacturers and other relevant departments to test the performance of mask bacteria filtration efficiency. Executive Standard Q/0212 ZRB003-2015 Bacterial Filtration Efficiency (BFE) Tester for Medical Surgical Masks Related Intellectual Property No.: ZL200820224142.6 Electric Flow Control Valve No.: ZL200820224143.0 Air capacity No.: ZL200920308391.8 Air filter material filtration efficiency detector Features þNegative pressure experiment system to ensure the safety of operators; þThe negative pressure cabinet has a built-in peristaltic pump, A and B two-way six-stage Andersen; the flow rate of the peristaltic pump can be set; þSpecial microbial aerosol generator bacteria night spray flow rate can be set, and the atomization effect is good; þ Embedded high-speed industrial microcomputer control; 10.4-inch industrial-grade high-brightness color touch screen; þUSB interface, support U disk data transfer; þThe cabinet has built-in high-brightness lighting; built-in leakage protection switch to protect the safety of operators; þThe inner layer of the cabinet is integrally processed into stainless steel, and the outer layer is sprayed with cold-rolled plates, and the inner and outer layers are insulated and flame-retardant; þFront opening and closing glass door, convenient for experimenters to observe and operate; þRemovable bracket with adjustable height; dual-purpose casters for supporting and moving.