Rebreather technology may be used where breathing gas supply is limited, such as underwater, in space, where the environment is toxic or hypoxic (as in firefighting), mine rescue, high-altitude operations, or where the breathing gas is specially enriched or contains expensive components, such as helium diluent or anaesthetic gases. The same technology on a vehicle or non-mobile installation is more likely to be referred to as a life-support system.
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A rebreather is generally understood to be a portable unit carried by the user. The purpose is to extend the breathing endurance of a limited gas supply, and, for covert military use by frogmen or observation of underwater life, eliminating the bubbles produced by an open circuit system and in turn not scaring wildlife being filmed. This differs from open-circuit breathing apparatus, where the exhaled gas is discharged directly into the environment. Oxygen is added to replenish the amount metabolised by the user. A fully closed circuit electronic rebreather ( AP Diving Inspiration)ĬCUBA (closed circuit underwater breathing apparatus) CCR (closed circuit rebreather), SCR (semi-closed rebreather)ĭavis apparatus, Self-contained breathing apparatus, Escape hoodĪ rebreather is a breathing apparatus that absorbs the carbon dioxide of a user's exhaled breath to permit the rebreathing (recycling) of the substantially unused oxygen content, and unused inert content when present, of each breath.
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