Van Veen grab sampler: Difference between revisions

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The Van Veen Grab Sampler is limnological instrument to sample sediment in the ocean. Usually it is a clamshell bucket made out of stainless steel. Up to 20 cm deep samples of roughly 0.1 m² can be extracted with this instrument. It is light-wight (roughly 5 kg) and low-tech. The smallest version even fits into hand luggage. A draw-back is that it tends to disturb the sediments more than a box corer. The Van-Veen-Grab it is not designed to sample living organisms.

Mechanism

While letting the instrument down into the water, the two levers with buckets at their ends are spread like an open scissor. The levers are locked in this position, and unlock when hitting the ground. When the rope is pulled upward again, the two buckets close and grab a sample from the sea floor.

External links

Instrument description at Woods Hole Oceanographic Institute

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 [[File:BrnBld VanVeenGrabSampler.svg|thumb|Silhouette of a '''Van Veen Grab Sampler''' locked open]]
-The '''Van Veen Grab Sampler''' is [[Limnology|limnological]] instrument to sample [[sediment]] in the [[ocean]]. Usually it is a [[Excavator bucket|clamshell bucket]] made out of [[stainless steel]]. Up to 20 [[cm]] deep samples of roughly 0.1 [[m^2|m<sup>2</sup>]] can be extracted with this instrument. It is light-wight (roughly 5 [[kg]]) and [[low-tech]]. The smallest version even fits into [[hand luggage]]. A draw-back is that it tends to disturb the sediments more than a hydraulically damped corer, it is not designed to sample living organisms.
+The '''Van Veen Grab Sampler''' is [[Limnology|limnological]] instrument to sample [[sediment]] in the [[ocean]]. Usually it is a [[Excavator bucket|clamshell bucket]] made out of [[stainless steel]]. Up to 20 [[cm]] deep samples of roughly 0.1 [[m^2|m<sup>2</sup>]] can be extracted with this instrument. It is light-wight (roughly 5 [[kg]]) and [[low-tech]]. The smallest version even fits into [[hand luggage]]. A draw-back is that it tends to disturb the sediments more than a [[box corer]]. The Van-Veen-Grab it is not designed to sample living organisms.
 ==Mechanism==