Teledyne Benthos’ patented vacuum sealed glass floats and instrument housings are manufactured from precision-molded spheres to exact specifications. The edge of each hemisphere is ground flat to extreme tolerances. When used for flotation our hemispheres are matched, mated, and then evacuated to an absolute internal air pressure of less than 0.3 atmospheres. After evacuation, a sealant and protective tape are applied around the equator. Spheres sealed in this method are nearly impossible to open due to the force exerted upon them by the atmospheric pressure. In the case of the 43.2 cm (17 in) diameter float, this force is in excess of 880 kg (2000 lbs).
Bright yellow, neutrally buoyant, polyethylene hard hats are available for glass protection, storage, and ease of handling. Hard hats consist of two flanged units bolted together with stainless steel hardware. Flanges can be bolted to a mounting framework, wire clamp, or chain section on a mooring line.
- 2040-17V; Glass Flotation Sphere 43.18 cm (17 in)
- 25.4 kg (56 lbs) Approximate Net Buoyancy.
- 204H-17 Standard hard hat housing for 17" spheres
- Diameter: 43.18 cm (17 in.) Weight in Air: 2.95 kg (6.50 lbs)