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  2. Halcyon PVR-BASC - Wikipedia

    en.wikipedia.org/wiki/Halcyon_PVR-BASC

    The fresh gas is added when the counterlung cover bottoms out towards the end of a breath, so the fresh gas is largely inhaled into respiratory dead space, and most of the mixing occurs after exhalation. Excess gas due to expansion during ascent is vented through the overpressure relief valve.

  3. Halcyon RB80 - Wikipedia

    en.wikipedia.org/wiki/Halcyon_RB80

    If the breathing gas supply is depleted, the dose of fresh breathing gas decreases until the breathing supply is used up. The diver will notice the decreasing volume of gas available which signals the need to switch to an independent open-circuit bailout system, which is integrated into the rebreather mouthpiece as a bailout valve, or to ...

  4. Rebreather - Wikipedia

    en.wikipedia.org/wiki/Rebreather

    Draeger Ray dive/surface valve with bite grip scuba mouthpiece, non-return valves, and breathing hoses. A breathing hose or sometimes breathing tube on a rebreather is a flexible tube for breathing gas to pass through at ambient pressure. They are distinguished from the low-, intermediate-, and high-pressure hoses which may also be parts of ...

  5. Category:Rebreathers - Wikipedia

    en.wikipedia.org/wiki/Category:Rebreathers

    This is a list of makes of rebreather breathing sets, and equipment that incorporates a rebreather. Subcategories. This category has the following 2 subcategories ...

  6. Rebreather diving - Wikipedia

    en.wikipedia.org/wiki/Rebreather_diving

    In closed circuit rebreathers the breathing loop gas mixture is either known (100% oxygen) or monitored and controlled within set limits, by either the diver or the control circuitry, but in the case of semi-closed rebreathers, where the gas mixture depends on the predive settings and diver exertion, it is necessary to calculate the possible ...

  7. Underwater breathing apparatus - Wikipedia

    en.wikipedia.org/wiki/Underwater_breathing_apparatus

    Underwater breathing apparatus can be classified as open circuit, semi-closed circuit, (including gas extenders) or closed circuit (including reclaim systems), based on whether any of the exhaled gas is recycled, and as self-contained or remotely supplied (usually surface-supplied, but also possibly from a lock-out submersible or an underwater habitat), depending on where the source of the ...

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