Electrical low-pressure impactor – ELPI (Dekati)

Measured parameters: Particle size and particle charge (online)
Size range: 6 nm to 10 µm
Measurement medium: Gases (dry)
Material restrictions: None
Link:    https://www.dekati.com/wp-content/uploads/dekati_elpi_brochure.pdf

The Electrical Low Pressure Impactor (ELPI) is a cascade impactor. The particles are charged (depending on their size) via a corona charger. Once charged, these particles are separated at the various impactor stages according to their aerodynamic diameter. An electrometer with a resolution in the fA range is connected to each impactor stage, allowing the charge per impactor stage to be measured online. Since the particle charge is known for a given particle size, the particle size distribution can thus be analyzed directly online. Furthermore, the ELPI can also be used without a corona charger, which enables the measurement of the net charge per particle size class.