use:

It is used to test the filtration efficiency of daily protective masks and medical masks on particulate matter, and to determine the obstructive performance of ordinary fabrics and medical protective masks against constant flow of airflow. Applicable to inspection centers, safety protection inspection centers, labor protection inspection centers, drug inspection centers, disease prevention and control centers, textile inspection centers, hospitals, mask manufacturers, etc.

 

Standards compliant:

GB/T 32610-2016, GB 2626-2006, GB 19082-2009, GB 19083-2010, GB 24539-2009, YY 0469-2011

 

Features:

1. The cold-generating aerosol generator is used to produce continuous and stable aerosol particles, which is convenient for filling the solution.

2. A high-precision PM2.5 sensor is used to measure the aerosol concentration.

3. The whole process of particle leakage prevention design protects the safety of experimenters.

4. 2 sets of aerosol generators: salt particulate aerosol generator and oil particulate aerosol generator.

5. Equipped with aerosol particle electrostatic charge neutralization device.

6. The pneumatic clamp is equipped with a protection device, which is safe and convenient to use.

7. Equipped with temperature and humidity sensors, real-time display of ambient temperature and humidity (temperature and humidity requirements: 25℃±5℃, 30%RH±10%RH).

8. Equipped with glass rotor flowmeter, vacuum pump, laser dust particle counter.

9. Control system: The computer controls the test process, automatically collects data, configures the computer and test software.

10. The computer automatically tests the gas concentration and automatically calculates the filtration efficiency; it can save, output, query, and print the test data.

 

Test principle:

Prepare a certain concentration of bacterial suspension, and generate specific aerosols through the aerosol generator (aerosol flow rate 2200±500CFE, average particle diameter should be ±0.3μm, and the geometric standard deviation of aerosol distribution should not exceed 1.5), and then Pass through the sample to be tested at a certain flow rate, collect bacteria in the aerosol that penetrates the sample, and count the bacteria after incubation to calculate the filtration efficiency of the sample for bacteria.

 

Test preparation:

Before the test, the samples should be pretreated for at least 4h in an environment of 21±5°C and a relative humidity of 85±5%. And use Staphylococcus aureus ATCC6538 to inoculate an appropriate amount of tryptic soy broth, shaking culture at 37±2℃ for 24h. Then the above culture was diluted to 5×10 5 CFU/ml with 1.5% peptone.

 

Test steps:

The test system does not put samples, the airflow of the sampler is controlled at 28.3L/min, the time to deliver the suspension to the sprayer is set to 1min, the air pressure and sampler running time are set to 2min, and bacterial aerosol is collected as a positive quality control.

After the positive quality control test is completed, install the test sample in the upper fixture of the sampler with the tested surface facing up, and perform sampling according to the procedure in 1).

Collect the air sample in the aerosol room for 2 minutes as a negative control.

The above process can be carried out simultaneously through a dual channel system.

Place the sampled agar plate at 37±2°C for 48h, count the positive wells of the bacterial particle aerosol forming unit, and use the conversion table to convert the number of possible impact particles.

More information, please visit: 
https://www.qinsun-lab.com/index.html