Real Driving Emissions (RDE) : Particle Number (PN) Portable Measurement Systems (PEMS) calibration

The PN-PEMS is considered a "black box" where efficiency tests and linearity have to be checked with thermally stable soot like aerosol. The efficiency is checked with monodisperse aerosol. The most straight forward way is to check the efficiency of the complete PN-PEMS but checking the thermal pre-conditioning unit and the particle detector of the PN-PEMS separately is also permissible. In the second case the two results have to be combined in one penetration efficiency. For the linearity check usually polydisperse aerosol is used in order to reach high concentration levels.