GRIMM Aerosol SMPS+C Manual
SMPS+C
This page provides an overview of the GRIMM SMPS+C aerosol measuring
equipment.
The Sequential Mobility Particle Sizer + Counter (SMPS+C) is
designed to make measurements of particles in the size range of ~5nm to
30 micrometres. It consists of two parts: the Differential Mobility
Analyser (DMA) and the Condensation Particle Counter (CPC).
DMA
The DMA differentiates particles by their electrical mobility and is
based on the principle of electrostatic classification. Aerosol
particles pass between electrodes in the DMA and are subject to an
electric field. These particles will all have different electrical
mobilities and this allows the DMA to separate the particles. Aerosol
particles within a certain size range are removed and passed on to the
CPC. Since the voltage size will determine the size range of particles
selected, the DMA may be used to produce a monodisperse aerosol of
specific size.
Contents of DMA Manual:
CPC
The CPC is used to find the concentrations of particles that are too
small to be counted by usual light scattering mechanisms. It works in
real time by the principle of nucleous condensation. Liquid vapour
condenses onto the small aerosol particles and these scatter light that
is then measured. Butanol is used as it is more efficient to use this
than water. The CPC may be battery operated if required and has a port
for the attachment of external analogue sensors. It may also be
remotely operated via a modem and has a data storage card for fieldwork.
Contents of CPC Manual:
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