the meaning of efficiency seems simple, but its meaning and value are quite different due to different test methods.
among the factors that determine the filtration efficiency, the meaning of "quantity" of dust is varied, so the calculated and measured values of filter efficiency are varied. In practice, the total weight of dust and the number of dust particles < P > are sometimes the amount of dust with a certain typical particle size, and sometimes the amount of all dust; There are also light flux (colorimetry) and fluorescence (fluorescence) that indirectly reflect the concentration by specific methods;
the instantaneous quantity of a certain state also has the weighted average quantity of the change efficiency value in the whole process of dust generation. Different methods are used to test the same filter, and the measured efficiency values will be different.
The testing methods used by different countries and manufacturers are not uniform, and the interpretation and expression of filter efficiency are quite different. Without the test method, the filtration efficiency is impossible to talk about. ?
The basic structure is as follows: dust generating system-compressed filtered air system and aerosol generator provide a certain amount of test dust
test chamber-main test chamber and sample clamping
monitoring and adjusting system-pressure monitoring and adjusting, providing dynamic test environment
result display and analysis system-monitoring transmitted aerosol and displaying test results
Applicable standards: EN 134, NIOSH, JMOL.