Condensation particle counter (CPC)

The TSI model 3750 Condensation Particle Counter is an instrument that detects airborne particles down to 7 nanometers in diameter at an aerosol flow rate of 1.0 liter per minute, over a concentration range of 0-100 000 #/cm³.
The aerosol sample is drawn continuously through a heated saturator in which butanol is vaporized and diffuses into the sample stream. Together, the aerosol sample and butanol vapor pass into a cooled condenser where the butanol vapor becomes supersaturated and prone to condense. Particles present in the sample stream (total suspended particles at PDM) serve as condensation nuclei. Once condensation begins, particles that are larger than a threshold diameter quickly grow into larger droplets and pass through an optical detector where they are counted easily.

L2B data available under ACTRIS framework at https://ebas.nilu.no/data-access/ (research key "Pic du Midi").