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FPS dilutes aerosol sample in two stages employing a perforated tube diluter and an ejector diluter. The dilution factor in both dilution stages can be adjusted by increasing or decreasing the amount of used dilution air. The dilution air flows are regulated with the FPS valve unit which contains critical orifices for accurate and repeatable control of air flows. The third component of the FPS is the control unit that controls different dilution parameters. The whole system is controlled with the provided FPSVI software or directly at the front panel of the control unit.
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The first, i.e., primary dilution stage can be operated with either cold or hot dilution air. Condensation and nucleation can be prevented with hot dilution whereas nucleation and other effects caused by volatile compounds can be maximized with cold dilution. Dekati can offer complete accessory kits with heaters suitable for both engine emission and stationary source sampling.The Dekati® Fine Particle Sampler is a guaranteed solution for diluting and conditioning aerosol and gaseous samples for measurement instruments. This versatile dilution system allows dilution factor adjustment between 1:20 and 1:200 and first stage dilution temperature settings between 0 and 350 °C. Temperatures and pressures in different parts of the dilution probe are measured in real-time enabling second-by-second dilution factor calculation, which takes changes in raw exhaust sample properties into account. The system can be directly connected to engine tailpipe both before and after exhaust cleaning devices enabling the use of the same setup for both types of measurements. Dekati® FPS-4000 features: Two stage dilution system with perforated tube and ejector diluters
Adjustable dilution factor between 1:20 and 1:200
Adjustable dilution temperature for efficient removal of volatile matter
Sample pressure range: 750 – 2000 mbar
Sample temperature range: 0 – 600 °C
Suitable for both pre- and post-DPF sampling
Provided with a user friendly control software that includes real-time dilution factor calculation and data storage
Stainless steel probe construction with no moving parts – no wear over long term use
