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Dekati® Diluter DI-1000 is probably the most widely used dilution device in measuring combustion generated particles. It is a low-cost and easy-to-operate device for diluting aerosol and gaseous samples from any source. In high temperature applications, the Dekati® Diluter is commonly used in a two-stage Dekati® Double Diluter setup, where the first Dekati® Diluter is heated and the second one operates at ambient temperature. This way unwanted condensation and nucleation effects are eliminated and the measured particle concentration and size distribution results are stable and repeatable.
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The sample can be taken directly from the tailpipe into the Dekati® Double Diluter setup eliminating the need for large full-flow sampling systems to carry out particle or gas measurements. Only purified pressurized air is needed to operate the Dekati® Diluter thus no flow control devices nor pumps are needed. Dekati® Diluters are manufactured with a default dilution factor of about 8. Other, specified, dilution factors are available with code DI-2002. The Dekati® Double Diluter setup is a widely used and well characterized dilution system for tailpipe emission measurements. It’s all stainless steel, no moving parts -construction makes it a robust and reliable choice for any emission measurements. The system consists of two Dekati® Diluters with the first dilution stage heated up to exhaust temperature. This method effectively reduces risk of condensation and unwanted sample transformations caused by volatile components in the sample. The secondary dilution is carried out with cold air reducing the temperature at the outlet of the dilution system to ambient level. The dilution factor of one Dekati® Diluter is about 1:8 giving the whole setup a total dilution factor of 64. Dekati® Double Diluter features: Two stage ejector diluter system with first dilution stage heated
Total Dilution factor of ~64
Sample temperature range 0 – 450 °C
Sample pressure range 800 – 1200 mbar (950 – 1050 mbar for use with pressure sensitive instruments)
All stainless steel construction, no moving parts
Extremely low particle losses, used as the golden system in comparison measurements by JRC
