The slotted-vessel sampler is implemented for sampling materials at the belt head or in the downpipe. This sampling principle is based on a slotted-vessel with defined intake slot vertical to the dropping material stream that records the material stream’s entire thickness at a constant speed.

The slotted-vessel sampler runs through the material stream from the waiting position with the base flap usually opened, closing this flap when the reverse position is reached.

The sampler now runs through the product stream with the base flap closed again at constant speed and thus takes a representative sample.

On the usually conical vessel reaching its waiting position, the base flap is opened by means of stops and a sophisticated lever system, and the slotted-vessel emptied.

The sampler’s waiting position is invariably located outside the material stream, thus minimizing wear to the sampler.