What particle size range can the PORTACOUNT measure?
The 50% cut-off for small particles is 0.02 micrometers (µm). This means that half of the 0.02 µm particles are counted and half are not. As soon as the particle size reaches about 0.04 µm, almost 100% are counted up until a particle size of about 1.0µm. Few particles larger than 1.0 µm are counted by the instrument because they impact and stick inside the switching valve or some other component. Statistically speaking, there are very few particles above 0.1 µm in normal ambient air. The percentage of particles counted is called “counting efficiency”. Counting efficiency is also a function of how much alcohol is in the PORTACOUNT.
