Dekati® Thermodenuder


Dekati® Thermodenuder removes volatile and semivolatile compounds from aerosol sample in order to eliminate unwanted sample transformations e.g. in engine exhaust measurements. The volatile and semivolatile compounds are vaporized when they enter the instrument and then adsorbed into active charcoal which has been designed to the form of mats for ease of use. The Dekati® Thermodenuder is especially suitable for use with the ELPI®+ (Electrical Low Pressure Impactor), also manufactured by Dekati Ltd, but can be used with any measurement device with a suitable flow rate.



Dekati® Thermodenuder features

  • Removes volatile and semivolatile compounds from exhaust sample
  • 10-20 lpm sample flow rate
  • Can be heated up to 300 °C
  • Easily replaceable active carbon mats

The Dekati® Thermodenuder’s main application is in removal of volatile and semivolatile matter from engine exhaust samples. If the engine exhaust is primarily diluted in a CVS tunnel, it may contain an unstable mode of nucleation particles and a high percentage of the PM mass may actually be volatile matter instead of soot. In these conditions, the Dekati® Thermodenuder is a highly effective tool to remove volatile matter and to always produce a ‘dry’ sample for the measurement instruments, thus increasing the repeatability and reproducibility of the measurements. The Dekati® Thermodenuder can also be used in connection with other Dekati® Sample Conditioning Instruments such as the Dekati® Diluter and DEED to ensure removal of all volatile matter in different measurement conditions.

More Dekati® solutions for engine exhaust measurements here.

Flow rate 10–20 lpm
Maximum operating temperature 300 ºC
Cooling medium Air or water
Weight 7.5 kg without filter cartridges
Length 95 cm
Width 22 cm
Inlet 12/10 mm pipe
Outlet R 1/2”, inner diameter of the connector should be 10 mm
Electric power 230V/350W, 110V/350W



Volatile and semi-volatile compounds cause variability in particle size and concentration measurements through condensation and nucleation. These effects can be eliminated by using the Dekati® Thermodenuder. In the Dekati® Thermodenuder, the volatile compounds are first vaporised in an aerosol heater, which heats the sample to over 250 °C. After heating, the sample enters the denuder section, where the vaporised compounds are adsorbed in active charcoal. The active charcoal is in the form of easily replaceable cartridges for more convenient use of the instrument. The sample is also cooled in the denuder section using either air or water as cooling media.


Temperature controller for the Thermodenuder heater

230 V DR-1623

110 V DR-1611







Spare active carbon cartridges

Other accessories include e.g. connectors and sampling lines, please contact Dekati Ltd.  for more information.

Dekati® Thermodenuder brochure

Available in customer pages section:

Thermodenuder Manual
Spare part catalogue
Calibration information


Can’t find what you’re looking for?

Contact Dekati technical support: support (at)

Contact Dekati sales: sales (at)


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Related products:
Dekati® Diluter
Dekati® DEED
Dekati® FPS