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Help CenterYS-0469A Surgical Mask Bacterial Filtration Efficiency (BFE) Tester
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【Instrument Features】:
1. This equipment fully meets the testing requirements of Appendix B test method in YY 0469-2011.
2. Simple instrument operation, convenient connection. After connecting the sample, one-button operation completes the test, improving testing efficiency.
3. Uses a biosafety cabinet negative pressure test system, equipped with fan exhaust system and inlet/outlet filters to ensure operator safety. Biosafety cabinet features liftable glass door for easy observation.
4. Operating system uses industrial-grade PLC for accurate data processing, supporting flexible parameter settings and experimental data storage.
5. Control terminal uses high-brightness color Chinese touch screen operation, with a friendly, simple, and easy-to-understand interface.
6. Core components are all original imported parts from renowned brands, ensuring higher detection accuracy and repeatability.
7. The equipment has good protection functions; it automatically activates protection when detection data exceeds limits, preventing damage from misoperation and reducing operator difficulty.
8. Equipped with microcomputer-controlled automatic start/stop pressure source, simple operation. The pressure source has its own pressure buffer tank for more stable output pressure.
【Technical Parameters】:
1. Positive pressure source and air filtration system, positive pressure output adjustable 5~500kPa.
2. Negative pressure source and filtration system, providing negative pressure gas source ≥60L/MIN.
3. Dedicated aerosol generation device, providing aerosol meeting test requirements for particle size and concentration.
4. Precision flow control: Range 0~30L/min.
5. Equipped with dedicated sampler for holding the test piece.
6. LCD touch screen display and operation.
7. PLC control.
Power: 220V/50Hz;
Test Time: 0-3600S settable.
【Air Circuit Schematic】:
1. The test device mainly consists of an aerosol generation device, aerosol chamber, sampler, and vacuum source.
1.1 The core components of the aerosol generation device are an imported UK aerosol generator and Japanese imported pressure control unit. The pressure control unit regulates the gas pressure applied to the aerosol generator to produce aerosol of suitable concentration and particle size. Gas pressure control to 0.1kPa, adjustable in real-time during experiments.
1.2 Considering that peristaltic pump dosing at 0.01ML/MIN is intermittent, a reservoir-type aerosol generator is chosen. Liquid medicine can be directly injected into the generator and adjusted via the spray nozzle.
1.3 Positive pressure source is provided by an oil-free air compressor, filtered through an air filter, and connected to the pressure control unit. Pressure adjustable from 5kPa~500kPa.
2. The aerosol chamber is manufactured according to Figure B.2, with two sampler interfaces and reserved filter interfaces.
3. The samplers are two Anderson samplers. The downstream of the sampler is controlled by a flow switch with adjustable flow rate, range 0~50L/min adjustable. Gas drying is required between the sampler and flow meter.
4. The vacuum source is provided by two vacuum pumps, each capable of providing negative pressure gas flow ≥30L/MIN.
【Program Functions】:
1. Open setting for each experimental step: Configure parameters for all steps in the experiment on a unified timeline, such as generator working time, sampler working time, etc., all with open start and stop times. Allows flexible and intuitive combination of experimental processes.
2. Negative pressure inlet pressure protection function, real-time monitoring of positive pressure inlet pressure to ensure gas demand for the aerosol generator is met during experiments, guaranteeing qualified aerosol production. Otherwise, alarm and stop experiment.
3. Negative pressure source protection function, real-time monitoring of negative pressure and flow during experiments to ensure standard test conditions are met. Otherwise, alarm and stop experiment.
4. Positive pressure gas automatic control function. Just input the pressure required for generator operation, the system's internal algorithm automatically performs feedback pressure adjustment to quickly stabilize at the desired pressure.
【Experimental Procedure】:
1. Turn on the air compressor and vacuum pump power and valves for inflation.
2. Connect all piping sections.
3. Connect the Anderson samplers.
4. Add test bacterial solution to the sprayer.
5. Set test parameters in the parameter setting interface according to the experimental times in standard B.4.
6. Follow the steps in B.4: perform positive control, sample challenge, and negative control experiments sequentially.
7. Culture the agar plates.
8. Clean the inside of the equipment and piping for the next experiment.
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