AVL Particulate Size ClassifierThe AVL Particulate Size Classifier (PSC) is an impactor for the classification of different particulate sizes in the diluted exhaust gas of DI IC engines.
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- The AVL PSC can be easily mounted on existing diluted Particulate Samplers between dilution tunnel and sampling pump
- The simple function principle of the AVL PSC allows easy implementation to existing Samplers without any software adaption
- Easy handling due to the small dimensions adapted to typical double filter holders
- Large size of the back-up filter (70 mm diameter)
- For result evaluation a Micro Balance, which is usually already existing on site for diluted particulate tests, can be used
- Increased reliability of test results by use of the "Two Stage Impactor" function
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An impactor is used to collect selectively particles of different sizes. An impactor is a simple device having two co-linear plates of which the upper one has small nozzles in it. Aerosol passes through these nozzles with high speed and makes a sharp turn to flow between the plates. Particles larger than a certain size cannot follow the sharp turn and impact to a second plate.
This "cutoff" size depends on the characteristic dimensions of the impactor stage. The "cutoff" diameter for an impactor stage is defined as the size of particles collected with 50% efficiency. The plate with nozzles in it is called the jet plate and the second one the collection plate. Cascade impactors consist of several successive impactor stage with decreasing cutoff diameters. The highest stage (stage 4) in the AVL PSC Particulate Size Classifier impactor has a cutoff diameter of 2.5 µ and the lowest stage (stage 1) 200 nm at a flow rate of 70 L/min.
- Impactor inlet: ISO 1/2" Quick connector
- Impactor outlet: ISO 1/2" Quick connector
- Collector: Aluminum foil
- Total dimension: 150 mm x 100 dia.
- Weight: 1,5 kg
- Nominal flow rate: 70 liter/min
- Acceptable flow rate: 50 ... 100 l/min
- Impactor stages: 0,2 µ, 0,5 µ, 1,0 µ, 2,5 µ at the nominal flow rate
- The cutoff diameters at different flow rates are tabulated in the data sheet
- Back up filter: Teflon coated glass fibre, 70 mm diameter
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