A Teledyne Benthos Flotation Datasheet Teledyne Benthos 17 inch Instrument Housing Glass Instrument Housings Deep Sea Glass Spheres GLASS SPHERES are a unique, reliable, cost effective method for flotation and the housing of electronic instruments in the marine environment. Teledyne Benthos is the world’s leading manufacturer of deep sea glass spheres and instrument housings. Ongoing improvements continue to insure their high reliability in extreme environments. Advanced assembly techniques and the patented VacuSealed closure method consistently result in high quality, long-life spheres. Teledyne Benthos continues to pressure test every sphere prior to shipment, assuring their integrity in the field. Deep sea glass spheres are superior to other types of flotation and instrument housing for several reasons: they are transparent, lightweight, inexpensive, corrosion resistant, easily handled, extremely strong, and non-polluting. As a result, they are preferred by oceanographers worldwide and are backed by over 50 years of experience in deep sea technology. PRODUCT FEATURES Teledyne Benthos patented VacuSealed 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 the hemispheres are 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 A Teledyne Marine Systems Company Glass spheres in protective hard hats 13 inch and 17 inch glass sphere. pressure. In the case of the 43.2 cm (17 in) diameter float, this force is in excess of 880 kg (2,000 lbs). VACUUM PORTS A titanium vacuum port (Model 204-VPT) can be installed in a glass instrument housing to facilitate opening and closing the sphere. The vacuum port option is recommended for any housing that will be opened frequently.

A Teledyne Benthos Flotation Datasheet Glass Instrument Housings FLOOD HOLES TECHNICAL SPECIFICATIONS Type Thermal Coefficient of Expansion Specific Gravity Young’s Modulus Poisson’s Ratio Refractive Index Thermal Conductivity Specific Heat DIMENSIONS, WEIGHT, AND DEPTH DATA Inside Diameter: Depth Rating: Outside Diameter: 204HR-17 Ribbed Hard Hat FLOOD HOLES 204-SRO-13 and 17 Super Ribbed Octagonal Hard Hat Standard 204H 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...