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Dekati® thermodenuder is designed to remove volatile and semivolatile compounds from sample aerosol particles. Before the analysis of hot exhaust particles, the sample usually needs to be cooled and diluted to the acceptable range of the measurement instruments. An uncontrollable sample handling may lead to condensation and supersaturation of the vapour compounds and thus different results in particle concentration, size distribution, composition and shape.
In the Dekati® Thermodenuder these volatile and semivolatile compounds are vaporized by heating the sample aerosol with an aerosol heater. After heating the volatile compounds are adsorbed in easily exchangeable active charcoal in the adsorber section, where the sample is also cooled.
The sample aerosol particles have much slower diffusion velocities (for 10 nm particles < 1/100) than the vaporized compounds. This is the main reason why the vaporized volatile compounds are collected efficiently in the active charcoal section while the sample aerosol particles follow the gas streamlines unaffected. The sample aerosol is cooled by pressurized air driven through the thermodenuder adsorber section. Dekati® Thermodenuder is designed for sample flow rates of 10-20 lpm.
The Dekati® thermodenuder heater and cooling can be directly controlled with the FPS system.
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