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Triggering ADV

Discussion in 'Rebreather Diving' started by pesstrus, Mar 14, 2019.

  1. pesstrus

    pesstrus Garibaldi

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    Good day,

    I just have a simple question actually;
    At what amount of millibar would you recommend to trigger the ADV on an ECCR?

    To avoid high DIL->O2 usage in the lower end, and pulmonary edema in the other, I've ended up at around 45-55mbar to trigger it. Am i on to something?


    In advance; for different reasons its not satisfactory for my use, to have it too tight and use it manually always.
    In advance #2; I apologize for my English, its not my first language.

    Thanks alot for any replies, its much appreciated:)
     
    rjack321 likes this.
  2. rjack321

    rjack321 Captain

    # of Dives: 1,000 - 2,499
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    Who has an ADV that is "adjustable"?
    My kiss has very limited capacity to adjust it. My Meg even less unless you dissect a schrader valve and somehow manipulate the strength of the tiny spring inside. I dont know the design of other ADVs but I frequently dive with mine shut off completely anyway
     
    pesstrus likes this.
  3. JohnnyC

    JohnnyC Divemaster

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    There’s adjustability built into those ADV’s that use second stage guts. My SF2 and my Pelagian are this way.
     
    pesstrus likes this.
  4. pesstrus

    pesstrus Garibaldi

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    I use one that's adjustable.

    If you dont use an adjustable one, you know what mbar is you non-adjustable set to?
     
  5. happy-diver

    happy-diver knowone has chosen. Lone Diver ScubaBoard Sponsor

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    I had this made for a chestmount

    Millibars, huh, I set the first stage to 8-9 bar if I even check
    then the ADV to sensitive with the knob out, exactly like open circuit

    full.jpg
    anyway I might get rid of it and go manual only

    but this one on another homemade I leave doing what it does

    full.jpg

    So in answer to the question I have absolutely no idea

    what I am doing here

    other than to show you this

    full.jpg

    That's the Draeger P port Apeks internals adjustable ADV up there on the right

    full.jpg

    poor baby a bit exploded at the moment awaiting adjustment following Mondays extravaganza

    there's adv again at the bottom
     
    pesstrus likes this.
  6. pesstrus

    pesstrus Garibaldi

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    Haha your post made me laugh at least:)

    To clarify; The ADV is adjustable as i can tighten/losen the spring , and read of the mbar values as i make it trigger. So i have it at a "comfortable" value, not leaking DIL, and not to tight to activate "automatically". So I just want to know if 45-55mbar(on surface) is an acceptable value.
    Experiences/studies/opinions things like that.
     
  7. Brad_Horn

    Brad_Horn Nassau Grouper

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    50-55mbar works nicely. Not freeflowing even when head down descending.

    I can suggest one. But not so much that it is designed to be adjustable, rather checked before shipping and adjusted/set to meet the CE requirements. With this detail, the actual cracking pressure, included in the shipping checklists.
     
  8. JohnnyC

    JohnnyC Divemaster

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    Whatever you do, don't do business with Brad Horn, Alex Deas, or anybody connected with Open Safety, APOC, or Deep Life.

    I'm amazed this dude hasn't been banned yet. The only reason he's not on a bunch of peoples ignore list is so we can warn other divers to stay away.

    @pesstrus , this guy went on a bunch of forums to try and retroactively manufacture evidence so that his partner could use it to bolster his "expert" testimony in a lawsuit again Lamar Hires and Dive Rite after Wes Skiles' wife sued them for his death. Needless to say his manufactured evidence was forcefully inserted waaaaaay up his butt so far I bet he could taste it in the back of his mouth. Search on the common forums for APOC and you'll see all of the shady stuff these guys do.
     
  9. rjack321

    rjack321 Captain

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    Location: Port Orchard, WA
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    I'm not sure how to measure the cracking pressure to be honest.

    The kiss uses a diaphram that I could probably submerge and measure the depth it cracks at (its superficially similar to a 2nd stage)
    the Meg is a plunger pushing on an oversized Schrader valve

    I dont know of any data suggesting ADVs are related to pulmonary edema. Do you have some papers or citations about that?
     
  10. pesstrus

    pesstrus Garibaldi

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    Brad_Horn likes this.

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