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www.sea-technology.com February 2016 / st 25 fes integration of the software drivers of each new sensor. Sensor Selection. The frst three pro- totypes of the Arvor-Cm were ftted with the following sensors: an Aanderaa 3835 dissolved oxygen optode, and either a WET Labs ECO FLNTU fuorometer- turbidity sensor, or a Turner Designs Cy- clops-7 fuorometer and a Seapoint tur- bidity meter. Results at Sea For each new profling foat architec- ture, the Arvor-Cm underwent a series of qualifcation tests in hyperbaric tanks and in the test tank facilities at Ifremer before being deployed at sea. The frst at-sea deployment was Sep- tember 16 and 17, 2014 in the Bay of Vilaine, France, as part of the Captiven project (Ifremer), and 12 cycles were successfully carried out. This frst sea trial allowed comparison of the data ac- quired by the Arvor-Cm with those of the Molit station, an instrumented moored buoy equipped with similar sensors. The second operational deployment was performed in the Gulf of Lion (Mediterranean Sea) with two Arvor-Cm profling foats February 4 to 23, 2015 during the Plumrho campaign. Two Arvor-Cm foats established a profle every 6 hr., for a total of 76 cycles each. Despite strong wind condi- tions, both foats remained on the continental shelf during this operation. Conductivity, temperature, dissolved oxygen, chlorophyll and turbidity data were suc- cessfully acquired from the seafoor to the sea surface, and sent to the Coriolis data center in real time. Finally, one Arvor-Cm was deployed on July 1, 2015 on the shelf in the Bay of Biscay as part of the ASPEX campaign and will be recovered in summer 2016. It records one multisensor profle every day at 12:00 UTC. Moreover, more than 100 ProvBio profling foats ftted with this architecture were also successfully deployed at sea as part of the Novel Argo ocean Observing System (NAOS) and Remocean projects to monitor the biogeochemical activity of offshore oceans. Conclusions, Future Developments To meet the growing demand for plat- forms equipped with additional sensors, Ifremer and nke Instrumentation designed the Arvor-Cm profling foat. The mechanical design of the Arvor-Cm includes the possibility of embedding up to four sensors in addition to the standard Sea-Bird CTD sensor, while remaining lightweight and easy to deploy. The electronic and frmware design was carried out jointly for ProvBio foats and is based on an innovative design that uses two separate circuit boards for navigation and data acquisition. This double-board architecture limits the impact of the addition of new sensor drivers, and re- duces the time required for qualifcation testing. The Arvor-Cm profling foat in action. HYDROCHART 3500 — THE CLEAR CHOICE FOR SHALLOW WATER OPERATIONS Hydrographic Interferometry With Exceptional Performance Klein's HydroChart 3500 provides unrivaled range and resolution performance in a compact, lightweight system. It features IHO SP-44 Special Order bathymetry with full swath coverage to 12 times the water depth or altitude, as well as high-resolution side scan imagery. For over 40 years, Klein has led the industry in developing innovative solutions for littoral applications and deep water surveys. To learn more about how Klein Marine Systems, Inc. is making the oceans transparent, please call us at (603) 893-6131, email Klein.Mail@KleinMarineSystems.com or go to KleinMarineSystems.com. E Klein is now a Mitcham Industries, Inc. Company