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Gravity Zero MK II User Manual

Oxygen rebreather, closed circuit system
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Danger: This words indicates an imminently hazardous situation, which if not avoided, will
result in death or serious injury.
Warning: This words indicates a potentially hazardous situation, which if not avoided, could
result in death or serious injury.
Caution: This words indicates a potentially hazardous situation, which if not avoided, may
result in minor or moderate injury. It may also be used to alert against unsafe
pratices.
MK II Oxygen Rebreather User Manual - Revision 01/2018 - Copyrights : Dr Fabrizio Pirrello © 2001- 2018
MK II Oxygen Rebreather
Closed Circuit System
User Manual
Definitions of Signal Word
Used in this Manual

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Summary of Contents for Gravity Zero MK II

  • Page 1 Caution: This words indicates a potentially hazardous situation, which if not avoided, may result in minor or moderate injury. It may also be used to alert against unsafe pratices. MK II Oxygen Rebreather User Manual - Revision 01/2018 - Copyrights : Dr Fabrizio Pirrello © 2001- 2018...

  • Page 2: Technical Data

    Oxygen Rebreather MK II is one of the most compact and lightest weight fully closed circuit oxygen rebreather on the market. A special version, called MK II pro is available on request; this version differs from the standard version MK II in having an innovative soft shield composed of kevlar-cordura wich keeps and protects the polyurethane rubber breathing bag from possible cutting and abrasion under special operating conditions.
  • Page 3 In the open position, the rotary valve supplies the oxygen to the diver. Harness. The harness (neck strap and waist strap) are easy to adjust to desired lenghts. MK II Oxygen Rebreather User Manual - Revision 01/2018 - Copyrights : Dr Fabrizio Pirrello © 2001- 2018...
  • Page 4 MK II - Figure 2 , Main Components MK II Oxygen Rebreather User Manual - Revision 01/2018 - Copyrights : Dr Fabrizio Pirrello © 2001- 2018...

  • Page 5: Functional Description

    Instead of a one-way gas circulation, to and from breathing bag as pendular type, the gas circulates in two separate directions. During the respiratory cycle the gas circuit is as in figure 4. MK II Oxygen Rebreather User Manual - Revision 01/2018 - Copyrights : Dr Fabrizio Pirrello © 2001- 2018...
  • Page 6 Actuating the by-pass lever is possible to restore the oxygen metabolized or to inflate quickly the breathing bag. An high pressure gauge screwed on valve assembly shows the pressure rate of the cylinder. MK II Oxygen Rebreather User Manual - Revision 01/2018 - Copyrights : Dr Fabrizio Pirrello © 2001- 2018...

  • Page 7: Pre-Dive Preparation

     push down the bypass button to assure that the pressure discharge (make sure that high pressure gauge  indicates zero). MK II Oxygen Rebreather User Manual - Revision 01/2018 - Copyrights : Dr Fabrizio Pirrello © 2001- 2018...
  • Page 8 Warning: if the soda lime isn’t packed tightly in the canister this can lead to “channelling”, where the exaust gas passes trough the scrubber without coming into full contact with the carbon dioxide absorbent. Figure 6 a, Refilling Soda Lime MK II Oxygen Rebreather User Manual - Revision 01/2018 - Copyrights : Dr Fabrizio Pirrello © 2001- 2018...
  • Page 9 Leaks can occur any number of places; check the breathing bag and hoses for punctures; check all the fitting and hoses connector to make sure they are properly closed. 6. DIVE Donning the Rebreather MK II Oxygen Rebreather User Manual - Revision 01/2018 - Copyrights : Dr Fabrizio Pirrello © 2001- 2018...

  • Page 10: Maintenance

     rinse into the breathing bag, disinfect with a bactericide solution and rinse again  MK II Oxygen Rebreather User Manual - Revision 01/2018 - Copyrights : Dr Fabrizio Pirrello © 2001- 2018...
  • Page 11 Biennial Maintenance Test the cylinder Overhaul the shut-off valve (manufacturer workshop) Overhaul (Every Four Years) Major overhaul of complete rebreather (manufacturer workshop) MK II Oxygen Rebreather User Manual - Revision 01/2018 - Copyrights : Dr Fabrizio Pirrello © 2001- 2018...
  • Page 12 Aquasure adhesive the surface roughened with a thickness of about 1,5 mm e) complete hardening takes place after one day. test repair prior to use MK II Oxygen Rebreather User Manual - Revision 01/2018 - Copyrights : Dr Fabrizio Pirrello © 2001- 2018...
  • Page 13 Do not ingest. If swallowed do not induce vomiting. Seek medical aid immediately. Avoid contact with skin or eyes. Keep out of reach of children MK II Oxygen Rebreather User Manual - Revision 01/2018 - Copyrights : Dr Fabrizio Pirrello © 2001- 2018...
  • Page 14 MK II Oxygen Rebreather User Manual - Revision 01/2018 - Copyrights : Dr Fabrizio Pirrello © 2001- 2018...
  • Page 15 MK II Oxygen Rebreather User Manual - Revision 01/2018 - Copyrights : Dr Fabrizio Pirrello © 2001- 2018...