/ 177 BENEFITS AT A GLANCE • High measurement resolution (0.001 FSN or 10 μg/m³) and low detection limit (0.002 FSN or 20 μg/m³) • Timely paper change due to remaining filter paper indicator • Altitude measurements up to 5,000 m above sea level and altitude simulation up to 5,000 m • High reproducibility, improved cleaning efficiency and increased robustness against wet exhaust gas due to shop air purging of the gas path – optional • Extended application range up to three bars exhaust back pressure for engines with exhaust aftertreatment systems – optional • Remote-control service with intuitive user interface – optional The measuring principle of the Smoke Meter makes it highly versatile. The variable sampling volume allows measurements on any generation of large engine or car engine, independent of the soot content in the exhaust. Effective length Sample volume Dead volume Filter area Effective length = Sample volume – Dead volume – Leak volume Filter area SMOKE MEASUREMENT WITH FILTER PAPER METHOD AVL Smoke Meter The AVL Smoke Meter is a filter-type smoke meter for measuring the soot content in the exhaust of diesel and GDI (gasoline direct injection) engines. The device has become the proven and tested standard in the automotive industry. The variable sampling volume and thermal exhaust conditioning ensures a wide range of applications, from combustion optimization at prototype engines to production monitoring. MEASUREMENT PRINCIPLE A defined flow rate is sampled from the engine’s exhaust pipe through a clean filter paper in the instrument. The filtered soot causes blackening on the filter paper which is detected by a photoelectric measuring head and evaluated in the microprocessor to calculate the result in FSN or mg/m³. The extremely high reproducibility of the AVL Smoke Meter is guaranteed by its variable sampling volume method and thermal heating. The sampling volume can be set automatically depending on the exhaust soot concentration. This even enables the measuring of the low soot levels of modern CI engines. APPLICATION Due to the easy installation and variable sampling volume, the AVL Smoke Meter can be used on engine testbeds as well as on chassis dynamometers. The smoke measurement comprises the whole range from modern diesel engines with aftertreatment systems to GDI engines. The many possible applications make it a perfect all-round system. The standardized measurement values can be compared all over the world, offering an additional benefit to globally operating companies. Thanks to the high repeatability achievable in the measurement values, the system can also be used for testing at the end of the production line, enabling the enabling the detection of very small tolerance deviations.