Testo DiSCmini is the smallest instrument capable of nanoparticle number measurement available today.
Testo DiSCmini is distributed in Spain and Portugal by IONER. Testo DiSCmini is a handheld particle counter for the measurement of nanoparticle number, average diameter and lung-deposited surface area LDSA with a time resolution of up to 1 second (1 Hz). Its small size makes the instrument particularly suitable for personal carry-on measurement campaigns.
Testo DiSCmini is based on the electrical charging of the aerosols. Positive air ions generated in a corona discharge are mixed with the aerosol. The charged particles are then detected in two stages by electrometers. The first detector stage is a pile of steel grids; small particles will preferably deposit on it by diffusion. The second stage is a high-efficiency particle filter which captures all the other particles. The mean particle size can be obtained by analysis of the two currents measured on the stages. The particle count is determined with the total current. Testo DiSCmini detects particles ranging in size from 10 to about 700 nm, while the modal value should lie below 300 nm. The concentration range is from about 1.000 to over 1.000.000 particles/cc. Watch this video to see how it works.