Legato means smooth and connected. The RBRlegato³ design and low-power operation is optimized for gliders and AUVs. The CTD is used to derive salinity, density, and sound velocity. The RBRlegato³ measures conductivity using a rugged inductive cell that is not affected by surface contaminants or freezing conditions. The CFD-optimised, low aspect ratio conductivity cell is self-flushing and does not require a pump. Using only 45mW when sampling at 2Hz or faster, and 18mJ/sample at 1Hz or slower, the power requirement is 90% lower than traditional pumped CTD sensors. When power management is critical to your mission, the lower power operation permits substantially longer deployments or higher resolution measurements. Totally silent operation is optimized for passive acoustic listening and turbulence measurements. The RBRlegato³ is designed to fit into a standard 2" x 7" sensor bay, with both wet- and dry-bay models, and is rated to 1250m.
The RBRlegato³ can seamlessly integrate and control your additional sensors. Using the standard RBR building-block system architecture, additional sensors such as dissolved oxygen, fluorescence, turbidity, and PAR are all supported. This sensor-hub design permits efficient system integration for vehicle integrators and users.
About the sensors
Conductivity is measured with an inductive sensor, suitable for deployment in marine, estuarine, or fresh water. There are no exposed contacts, which increases robustness, avoids susceptibility to surface contamination, and allows it to be frozen into ice without damage.
The temperature sensor is built and calibrated in-house using an aged thermistor. The temperature channel is calibrated an accuracy of ± 0.002°C (ITS-90) over the range -5 to +35°C. Extended range calibrations are available.
Pressure is measured with a piezo-resistive transducer built with a nickel based superalloy diaphragm to avoid corrosion. Accuracy is 0.05% of the full scale rating and resolution is 0.001%.