Due to the high temperatures required to pyrolyse the organic compounds, the use of metallic filters made of a mesh of few microns diameter fibres was necessary to collect the aerosols. Multi-layered Beckaert ST10 filters (porosity = 80%, thickness ~ 0.4mm, fibre diameter ~ 0.4 mm), were chosen, which present the more appropriate coupling between efficiency and pressure drop in view of the experimental needs. The ACP filter (FIL) has a thimble like shape (inner diameter 10 mm, height 28 mm, S = 10 cm2), and which thickness is 0,5 mm. It is fixed at its base to a ring cramped to the filter mechanism rack which allows its motion inside (stand-by or heating) and outside (aerosol capture) the oven. The filter mechanism, (FIM) is a rack and pinion assembly that translates the filter 120 mm along the sampling tube (ST) between the sampling position and the oven inner position. Bottom end of the filter is made of a mesh disk, laser brazed to the mesh cylinder ; this disk will face directly the gas and aerosols path during sampling phases. When the cap of the sealing cover is ejected and the filter is in its sampling position, bottom end of FIL is 4 mm below the entrance, 28 mm from the external surface of the probe fore dome.

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