|
The Halcyon RB80 is a non-depth-compensated passive addition semi-closed circuit rebreather of similar external dimensions to a standard AL80 scuba cylinder (11 litre, 207 bar aluminium cylinder, 185mm diameter and about 660mm long). It was originally developed by Reinhard Buchaly (RB) in 1996 for the cave exploration dives conducted by the European Karst Plain Project (EKPP). About 1/8 of the respired volume of breathing gas in the circuit is discharged during each breathing cylcle by a concentric bellows counterlung system, which reduces the loop volume and is replenished by internal valves, triggered by low loop volume, similar to the function of the demand valve of a scuba regulator. The Halcyon RB80 was introduced as a replacement for the much bulkier and more mechanically complex PVR-BASC, which was depth compensated and used a ballasted bellows counterlung. ==Specifications== *5.6 lbs (2.54 kg) scrubber absorbent load provides approximately eight hours of scrubber endurance *8:1 counterlung volume ratio provides substantial gas extension, with a loop oxygen fraction lower than the feed gas composition. The decrease in oxygen fraction depends on the supply gas oxygen concentration and the operating depth. The difference is less at greater depth, but can be quite large at shallow depths. *The inner bellows automatically vents water from the loop *Semi-closed operation eliminates the risk of unit-induced oxygen toxicity (max PPO2 is that of the supply gas connected) *Full access to on-board gas supply in either semi-closed circuit or open circuit bailout *Cylinder volume to user's choice. Large cylinders can be carried.〔Staff, Halcyon official website, ''RB80 Rebreather'', http://www.halcyon.net/RB80 accessdate 6 May 2013〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Halcyon RB80」の詳細全文を読む スポンサード リンク
|