HTDMA (custom-mate at ACES, Univ. Stockholm)

Hygroscopic Tandem Differential Mobility Analyzer (HTDMA)
Project closed (2012-2013)

The custom-made HTDMA from the Stockholm University was set up in Chacaltaya during 2012 and 2013 for a short campaign. It allows to measure the hygroscopicity (water uptake) of aerosols and it is suitable for any application where information is required on how particles of a selected diameter grow when they are exposed to controlled conditions of relative humidity.

It consists in two Differential Mobility Analyzers sequentially assembled. The first one allows the selection the size of the dry particle to characterize and the second one measures the size distribution of the hydrated particle after it has passed through a humidified chamber.  The ratio between the wet and dry diameters is referred to as the particle's growth factor.

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