Abstract
ABSTRACTWe present a new field-deployable expansion chamber condensation particle counter—the versatile size analyzing nuclei counter (vSANC). The measuring principle, which was adopted from the classical SANC, was optimized regarding ranges of operating temperatures (−20°C to +40°C), inlet gas pressures (0.2–1.2 bar), inlet flow rates (1.6–9 l/min) and condensing liquids (alcohols, alcanes, water, etc.), all of which make vSANC applicable to a wide variety of environments. Precision determination of vapor supersaturation ratios allows estimating neutral cluster sizes without prior electrical-mobility based classification of the sample. Additionally, absolute number concentrations ranging from can be measured without referring to external calibration standards. This enables size-resolved number concentration measurements of nanoparticles. Laboratory studies using n-propanol as condensing liquid demonstrated that charged (NH4)2SO4 and WOx particles as small as 1.5 nm can be counted with an efficiency of 10...
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