Rosette sampler

Rosette samplers are used in the ocean and large inland water bodies such as the North American Great Lakes in order to investigate quality.

Rosette samplers are a key piece of equipment in oceanography and have been used to collect information over many years in repeat hydrographic surveys.

[1] Each bottle is a volume that range from a minimum value of 1.2 L to a maximum value of 30 L.[1] The bottles are clustered around a cylinder situated in the center of the assembly,[1] where there is a sensing system called Sea-Bird or CTD, that stands for "Conductivity, Temperature and Depth", although other variables can be measured by modern CTDs (e.g. water turbidity, dissolved oxygen concentration, chlorophyll concentration and pH).

A winch on board of the boat unrolls the rope during descent and rolls up it during the ascent (i.e. at the end of the samples collection).

During operations in the ocean, a rosette sampler can approach the seabed at a distance from 1 to 5 m, depending on the particular sea conditions.