DEMC

The CH Technologies Differential Electrical Mobility Classifier (DEMC) is manufactured by Palas GmbH. Classifiers have the ability to select aerosol particles according to their electrical mobility and pass them to the classifier's exit. The DEMC series enables the user to generate monodisperse particle fractions from polydisperse ultrafine aerosols with up to 64 size classes per decade.

A DEMC is also widely known as Differential Mobility Analyzer (DMA). The DEMC (see also ISO 15900) selects the particles based on their electrical mobility. If the DEMC is used as a component of an SMPS system, then the voltage and thus the electrical field continuously change and particles of varying mobility consecutively exit the DEMC. Particle counters, such as the UF-CPC or the Charme® count the particles of the individual monodisperse fractions.

Reliable software interprets data such as voltage, particle number, etc. in order to obtain a particle size distribution. The DEMC software and firmware support the use of nanoparticle counters by other manufacturers.