The European Standard EN 143/149 used to define multiple tests for respiratory protective devices. In the most recent draft from 2017 all test methods have been removed and it now refers to EN 13274-7 instead.
Lorenz’s aerosol generator has been modified accordingly to deliver the correct aerosol particle size distribution and mass concentration. Typical aerosol parameters from our EN 143/149 generator are shown in direct comparison to the new EN 13274-7 generator. The mass concentration can be adjusted over a wide range; listed values correspond to the normative defaults.
With particles from the new generator being larger they coincide less with a typical filter’s MPPS (most penetrating particle size). Preliminary tests show reduced filter penetrations/higher efficiencies, as expected.
|EN143 Generator||EN13274-7 Generator|
|Count median diameter||165 nm||325 nm|
|Geom. std. deviation||2.0||2.0|
|Concentration (adjustable)||(15 – 25) mg/m³||(15 – 25) mg/m³|
The modification presented here is also available as an upgrade kit. Get in touch with us to verify if your generator can be upgraded!