3. Deployment
CB-Series Data Buoy Ballast Weight & Stability
Ballast weight may be needed to prevent overturning a CB-series buoy system and ensure stability in
the water. The center of gravity of NexSens CB-Series buoys is near the water surface without
instruments connected. Therefore, any top-side weight added above the water’s surface (e.g., sensors,
sensor mounts) must be appropriately counterbalanced by ballast weight below the surface (e.g.,
instrument cage, chain, anchors, etc.). Before deploying a buoy system, some experimentation may be
required to balance the system properly.
Top-Side Weight
Top-side weight is any weight mounted on the buoy above the water surface or the buoys’ center of
gravity. Top-side weight located further from the buoys’ center of gravity will cause greater instability of
the buoy. For example, suppose a weather sensor is mounted 36″ above the water surface (Figure 2).
In that instance, the sensor mount will cause more buoy instability than mounted 24″ above the
surface (Figure 3). As a result, the buoy would require more subsurface ballast weight to
counterbalance.
Figure 1: NexSens CB-450 buoyancy diagram.
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Summary of Contents for CB-150 Data Buoy
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