The free-fall corer sampler is designed to sample submerged soils/sediments at greater depths, from the bottoms of rivers, lakes, etc.
The free-fall corer consists of a frame, falling weight and sampler. The sampler is especially designed to take samples at greater depths (>30 metres). By using a hoist unit (davit) on board of a boat, the sampler is lowered in free fall. By its own weight and obtained velocity, the apparatus will penetrate the submerged soil.
Semi-disturbed samples can be obtained from the top layer of submerged sediments. The depth of penetration is partly determined by the composition of the material. If the bottom is rich of mud, penetration will reach about 80 centimetres; in more sandy material it will be about 30 centimetres. The system is fitted with a non-return valve at the top of the sampler so that no water remains floating above the sample. This ensures that the sample remains in place.
The Free-fall corer is not suitable for rocky bottoms, and unconsolidated materials will not hold.
Please note that an installation is required for hoisting and lifting.
|Free-fall corer - standard set
|Maximum sample depth
|> 30 m
|Iron, PVC, other material
|Rod or cable operated
|Sample stored in
|118 x 45 x 62 cm
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