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In this study, a novel designed particle sizing system, called two-column particle sizer (TC-PS), was developed to measure simultaneously the total particle number concentration and particle size distribution. The TC-PS consists of a compact condensation particle counter with two sampling inlets (TC-CPC) and a miniaturized differential mobility analyzer (mini-DMA). The entire TC-PS system, with other main parts for operation, such as pumps, pressure sensors, board, neutralizer, frame, and other small components, weighed only 1.7 kg and was designed to accommodate mobile measurements for atmospheric research. Systematic experiments were performed to evaluate the counting efficiency of the TC-CPC for calibrating the instrument and correcting the coincidence errors. Particle size distributions obtained by the TC-PS were compared to the reference TSI-scanning mobility particle sizer (TSI-SMPS), and the results from the proposed and reference system for different particle concentrations and materials agreed well. Finally, 24-h data of particle number concentration and size distribution were obtained by the TC-PS in the laboratory in regular working environments. The TC-CPC measurements showed a good response to a fast changing concentration, and the obtained particle size distribution represented the events well, especially in the case of particle formation and high concentration due to the soldering activities in the laboratory. Copyright © 2023 American Association for Aerosol Research

Development of a two-column particle sizer (TC-PS) for simultaneous measurements of particle concentration and size distribution