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Default Nitrox Setting for Perdix AI in OC Mode

Discussion in 'Shearwater Research' started by g2, Apr 13, 2019.

  1. rabe

    rabe Barracuda

    # of Dives: 200 - 499
    Location: Brisbane
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    Exactly: it doesn't switch automatically (which, btw, it would be insane if it really could do that, but this is another story).

    When you plan a dive with multiple gasses, you program them on the Perdix, and when is time, you switch gas, then you switch also on the computer (in that order exactly).
     
  2. Manatee Diver

    Manatee Diver Manta Ray

    # of Dives: None - Not Certified
    Location: Tampa Bay, FL
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    It doesn't switch automatically. When a better gas becomes available, the area with the current gas mix becomes yellow. Beyond that it is up to you to change your gas using the menu. The TTS calculation assumes that you are going to make that gas switch, but the deco algorithm doesn't change the deco schedule until you actually do.
     
    rhwestfall likes this.
  3. Brules

    Brules Loggerhead Turtle

    # of Dives: 200 - 499
    Location: Oklahoma City
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    So after talking to Shearwater in detail and using this recently on multiple dives in Cozumel - it is a NON ISSUE unless you violate DECO.

    So you can set up 3 gases for REC diving (21/32/36) and switch away using the quick change gas menu between dives. Worked flawlessly for me as I never broke DECO or got close. Would dive air 1st dive, and during SI change to 32 or 36 and then back again next day for air.

    Loved how easy and simply it was vs any other computer out there.
     
    KWS likes this.
  4. npole

    npole Barracuda

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    As a general rule: on a computer do not set ON any gas you don't carry or you don't plan to use in that dive. There's no reason to do otherwise (especially because you can set and change their state during the dive in case of a emergency or unplanned mix usage).
     
    KWS and rhwestfall like this.
  5. KWS

    KWS ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 500 - 999
    Location: SE TEXAS
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    It auto switches ????? or flags you to change to another gas that it turned on??? this is dangerous if it auto switches.
     
  6. JohnnyC

    JohnnyC PADI Pro

    # of Dives: 1,000 - 2,499
    Location: United States
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    It doesn't auto switch. In ANY mode. It highlights your gas selection when there is a better gas turned on, but it doesn't auto switch.
     
    rabe and KWS like this.
  7. KWS

    KWS ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 500 - 999
    Location: SE TEXAS
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    NOw that makes sense. My shearwater highlights / flags me of the next best gas per what I have active. I could not imagine anything that auto swaps.
     
  8. KWS

    KWS ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 500 - 999
    Location: SE TEXAS
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    Perhaps just to stir the pot a bit. In rec diving it would probably only be noticed,,,, if at all,,,,, when you use air and have nitrox turned on. I will assume that nitrox wold be the better gas if given the option. Still the best practice is to follow the guidence you posted. turn on only gasses you will use.
     
  9. tursiops

    tursiops Marine Scientist and Master Instructor ScubaBoard Supporter

    # of Dives: 2,500 - 4,999
    Location: U.S. East Coast
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    Cochran
     
  10. KWS

    KWS ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 500 - 999
    Location: SE TEXAS
    4,445
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    Is this cochran computer a computer designed for rec divers or tech divers. or a tech computer with a rec mode capability like shearwater is. As a rec diver goes I think auto change is a bad thing. as a tech diver goes who is experienced in the computer use can work well with it doing it and would be of benefit to them, so long as they do physically switch. If cochran has a pure rec computer do they auto switch? It would seem to me that any gas switching would be a tech world event. That does not however stop rec divers from entering deco and not know it. I cant say that I have ever been in deco on a rec dive so I dont know what my puter does. but I have had multiple gasses turned on and have never been flagged to change air to nitrox of the reverse. I have always on a trimix dive been flagged when to shift to deco gas. Still for teh rec minded Rec diver auto switching could be big problems. I would hope that if cochran does this it does it when is a tech diving mode and not in a rec mode.

    All this being asked frm the rec perspective since this is I think a rec thread and not a tech area thread.
     

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