| 摘要 |
Automatic volumetric apparatus for taking samples of fluid material, in particular in granular or powdered form, contained in a sampling zone, such as a hopper, where it is stored, either during treatment, or during conveyance, comprising a horizontal cylindrical probe having a longitudinal recess of trapezoidal section for the removal of a predetermined volume of material from the sampling zone, the probe being mounted to move inside a fixed closure member constituted by a sleeve co-axial to the probe. A drive unit drives the probe axially between a retracted position in which the recess is located in a discharge zone and an extension position in which the recess is located in the sampling zone. The drive unit rotates the probe with respect to the closure member in going between the extension position and the retracted position, so that the recess is directed respectively upwards and downwards, the closure member being provided with an aperture whose area is substantially equal to that of the opening of the recess and arranged so that it is in registry with the recess solely when the latter is in its retracted position for discharge. A one-piece sealing element surrounds the aperture of the closure member to prevent entry of foreign particles into the discharge zone.
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