Sub-23nm Particle Measurement

Counting Solid Particles Below 23nm

Concerns exist that advances in modern engine technology may contribute to large portions of solid particles at sizes smaller than 23nm. The EU Joint Research Center has confirmed this concern in several investigations. The size range of counted particles for engine and vehicle certification currently has a lower limit of 23nm, but will likely be reduced to 10nm.

In an upcoming legislative change, portable emissions measurement systems (PEMS) for particle number (PN) measurement will also need to accurately measure the sub-23nm contribution of solid particles under RDE conditions. This is currently under investigation by the EU-funded PEMs4Nano project. The findings will be taken as a basis for the draft of the respective PEMS procedure.

The new 10nm MEXA-2010SPCS as well as upgrades to the existing MEXA-2000SPCS are now available to prepare for the possible introduction of the new sub-23nm legislation. This system reliably counts solid particles between 10nm and 2.5µm using a reduced detector cutoff, an improved volatile particle removal with the latest hot catalytic stripper technology, and a system recalibration to address particle losses.

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