We are accredited in accordance with ISO 27891:2015-03 (Aerosol particle number concentration, Calibration of condensation particle counters) for the calibration of CPCs or other particle number measuring devices. Therefore, your measuring device is compared with a size-selected (monodisperse) aerosol with our reference. Concentrations of 1,000 to 30,000 cm^-3 with sizes between 10nm and 200nm can be generated. An aerosol electrometer is used as a reference device, so traceability is first degree to SI units.

In a sampling system, particles are subject to various physical and chemical processes that affect the number of particles. These depend on the size and nature of the particles. In order to carry out accurate measurements, it is necessary to be able to quantify these mechanisms. For this purpose, the size-dependent particle concentration reduction factor (PCRF) is determined. This is necessary to calibrate measuring devices for the homologation of vehicles according to the GTR-15 ("Euro standards"), or to correctly interpret measurement results when aerosols are sampled. We can determine loss factors of particles in the size range 10nm to 200nm up to 1:30,000.

In contrast to the calibration of the monodisperse particle count, polydisperse particles are not size-selected, but the measuring devices are exposed to an aerosol with particles of different sizes. However, there are usually requirements for the size distribution of the particles. This measurement can be carried out with higher concentrations of 5,000 to 3 million cm^-3 . This is used, for example, to calibrate workshop emission testers or PEMS testers (portable emission measurement system). Various particle sources are available, such as soot, salt or silver.