DLPI (Dekati® Low Pressure Impactor) is a 13–stage cascade low pressure impactor to determine particle gravimetric mass size distribution. The size classification in DLPI is made from 30 nm up to 10 μm with evenly distributed impactor stages and can be extended down to 30 nm with an additional back–up filter. In each size fraction the particles are collected on 25 mm collection substrates that are weighed before and after the measurement to obtain gravimetric size distribution of the particles. A chemical analysis of the size classified particles can also be performed. Other DLPI characteristics include low inter–stage wall–losses¹ and robust yet easy–to–use operation. The rigid stainless steel construction of the DLPI makes it suitable for a wide variety of applications including power plant and vehicle emission measurements, engine blow–by measurements, air quality studies and pharmaceutical inhalation aerosol device testing.
¹Marjamäki, M., Keskinen, J., Chen, D&ndas;R. and Pui, D. Y. H. (2000) Performance Evaluation of the Electrical Low–Pressure Impactor (ELPI), Journal of Aerosol Science 31:2, pp. 249–261.
² Virtanen, A., Marjamäki, M., Ristimäki, J., Keskinen, J. (2001). Fine particle losses in electrical low–pressure impactor, Journal of Aerosol Science, vol 32, pp 389–401.
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