The meaning of efficiency may seem simple, but its meaning and value vary greatly depending on the test method.
In the factors that determine the filtration efficiency, the dust "amount" of the meaning of a variety of factors, the resulting calculation and measurement of the efficiency of the filter is also a variety of values. Practical, there is the total weight of dust, dust particles
Sometimes for a typical particle size of the amount of dust, sometimes the amount of all dust; there are specific methods to indirectly reflect the concentration of fluorescent light (colorimetric), fluorescent light (fluorescence);
Some kind of state of the amount of the instantaneous, but also the whole process of the change in the efficiency of the dust weighted average amount of the value. The same filter using different methods of testing, measured efficiency values will be different.
The test methods used by various countries and manufacturers are not uniform, and the interpretation and expression of the efficiency of the filter vary greatly. Leaving the test methods out of the equation, there is no way to talk about filter efficiency.?
Basic structure: Dust generation system - compressed filtered air system with aerosol generator to provide a certain amount of test dust
Test chamber - the main test chamber and the specimen clamping
Monitoring and regulating system - monitoring and regulating the pressure, to provide a dynamic testing environment
Results display and analyzing system - to monitor the permeation of the aerosol and display the results of the test
Applicable standards: EN 134, EN 136, EN 137, EN 138, EN 139, EN 139, EN 139, EN 139 and EN 139 p>Applicable Standards: EN 134, NIOSH, JMOL, GB 19083