This comment adds performance data for a modified version of one of the optical particle counters investigated in Heim et al. (2008), namely the WELAS 2100. The new version was found to have a counting efficiency much closer to unity for larger particle sizes as well as some improvement in the lower 50% detection limit.
Comment on‘‘Performance evaluation of 3 optical particle counters with an efficient multimodal calibration method’’ (Heim etal.,2008) - Performance of improved counter
B.J. Mullins, D. Kampa, G. Kasper
Journal of Aerosol Science, 2012, 49, 48-50