The diluent gas mixture usually contains enough oxygen so that it can be breathed directly from the cylinder via an open-circuit system at the operating depth of the dive. This supply is used to maintain system volume during excursions to depths where the volume of gas in the breathing loop is compressed. In some rebreathers the diluent is also used for the emergency open-circuit bailout gas supply in the event of a total system failure of the rebreather apparatus. The second major difference between closed-circuit rebreathers and semi-closed rebreathers is how the two systems maintain the concentration of oxygen in the breathing loop.
Whereas most semi-closed rebreathers maintain a (more or less) constant fraction of oxygen (FO2) throughout the course of the dive, closed-circuit rebreathers maintain a relatively constant partial pressure of oxygen (PO2) in the breathing loop. In most cases, closed-circuit rebreathers also incorporate an electronic O2 control system, which automatically adds oxygen when the PO2 drops below a certain level (this level is called the PO2 set-point). This level of discipline requires a great deal of discipline and training. Thus rebreather divers must have a higher dedication to equipment maintenance and operation than is generally required for open-circuit divers.
- Advanced EANx Diver or equivalent
- Minimum age: 18 years.
This Program is designed to train competent divers in the safer use and technology of the Buddy Inspiration. You will be able to use the unit in any mode. You will be able to strip and reassemble the unit down to component level (excluding Computers). A minimum of eight hours in-water training to complete the course, in a combination of confined water and open water environments. Theory of Rebreathers in general will be covered, as well as the Buddy Inspiration specifically.
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