+ Reply to Thread
Results 1 to 7 of 7

Thread: That "Unintended Consequences" thing....

  1. #1
    Darlene Starr - DIY Diva Scuba_Vixen has a brilliant future Scuba_Vixen has a brilliant future Scuba_Vixen has a brilliant future Scuba_Vixen has a brilliant future Scuba_Vixen has a brilliant future Scuba_Vixen has a brilliant future Scuba_Vixen has a brilliant future Scuba_Vixen has a brilliant future Scuba_Vixen has a brilliant future Scuba_Vixen has a brilliant future Scuba_Vixen has a brilliant future Scuba_Vixen's Avatar
    Join Date
    May 2005
    Location
    St. Croix USVI
    Posts
    1,119

    That "Unintended Consequences" thing....

    Hey Gang,

    Over in the homebuilt rebreather forum, we've got a running thread on building a "DIY Tempstik". http://www.rebreatherworld.com/showthread.php?t=29238

    I've gotten to having a working prototype, (towards the bottom of page 2) and am looking at scaling the prototype's pcb down to fit into my scrubber, as some couch dive testing/data gathering is the next phase.

    As I look at putting a strip of circuit board with sensors on it running virtually the length of my scrubber bed, I wonder if an Unintended Consequence, may be that it creates a channeling path, and if I plan the pcb length to allow it to go in at an angle, might it mitigate the channeling risk?

    Hoping you guys might have some thoughts on this,


    Darlene

  2. #2
    RBW Member WD8CDH is an unknown quantity at this point WD8CDH's Avatar
    Join Date
    Dec 2007
    Location
    NY
    Posts
    112
    Homebuilt mCCRs, eSCR

    MK15, Electrolung, others

    Re: That "Unintended Consequences" thing....

    I don't think that a temp stick running straight down the scrubber would cause any more risk to channeling than a clamp rod down the middle. I think running it at an angle would cause more of a risk if you are not carefull with packing the scrubber.

  3. #3
    RBW Member jkaterenchuk has a reputation beyond repute jkaterenchuk has a reputation beyond repute jkaterenchuk has a reputation beyond repute jkaterenchuk has a reputation beyond repute jkaterenchuk has a reputation beyond repute jkaterenchuk has a reputation beyond repute jkaterenchuk has a reputation beyond repute jkaterenchuk has a reputation beyond repute jkaterenchuk has a reputation beyond repute jkaterenchuk has a reputation beyond repute jkaterenchuk has a reputation beyond repute jkaterenchuk's Avatar
    Join Date
    May 2006
    Location
    PA
    Posts
    2,953
    HammerMeg

    Kiss Classic, Inspiration

    Re: That "Unintended Consequences" thing....

    Interesting and good question. I will be interested to hear the answers posted. If you look at it from the perspective of a CO2 molecule I would think the walls of the scrubber would also look like a even bigger path for channeling.

    OK guys and gals....we are going to do a sneak attack...stay close togeather, keep your back to the wall and lets crawl up here undetected until we get to the top....then she's a goner.

    John

  4. #4
    RBW Member veriqster is an unknown quantity at this point veriqster's Avatar
    Join Date
    May 2007
    Location
    Worcester
    Posts
    18

    Re: That "Unintended Consequences" thing....

    even if it creates some channeling, would it not still show you the usage of scrubber material but at an accelerated rate? I mean the little soda that is in the path would "burn out" quicker and you wood still see when that "channel" has been exhausted and the breakthrough is about to occur, ... ???

    Quote Originally Posted by Scuba_Vixen  View Original Post
    Hey Gang,

    Over in the homebuilt rebreather forum, we've got a running thread on building a "DIY Tempstik". http://www.rebreatherworld.com/showthread.php?t=29238

    I've gotten to having a working prototype, (towards the bottom of page 2) and am looking at scaling the prototype's pcb down to fit into my scrubber, as some couch dive testing/data gathering is the next phase.

    As I look at putting a strip of circuit board with sensors on it running virtually the length of my scrubber bed, I wonder if an Unintended Consequence, may be that it creates a channeling path, and if I plan the pcb length to allow it to go in at an angle, might it mitigate the channeling risk?

    Hoping you guys might have some thoughts on this,


    Darlene

  5. #5
    Choose Freedom - UKIP Scubascooby is a jewel in the rough Scubascooby is a jewel in the rough Scubascooby is a jewel in the rough Scubascooby is a jewel in the rough Scubascooby is a jewel in the rough Scubascooby is a jewel in the rough Scubascooby is a jewel in the rough Scubascooby's Avatar
    Join Date
    Nov 2005
    Location
    Great Britain
    Posts
    678

    Re: That "Unintended Consequences" thing....

    I have not experimented but just thinking theoretically...

    I would try to avoid creating a void between the stick and canister through which gas could channel.

    If the stick is perpendicular to the wall then the surface area along which gas can channel will be greater than if it is flat against the wall.

  6. #6
    New Member
    saveourseas has a brilliant future saveourseas has a brilliant future saveourseas has a brilliant future saveourseas has a brilliant future saveourseas has a brilliant future saveourseas has a brilliant future saveourseas has a brilliant future saveourseas has a brilliant future saveourseas has a brilliant future saveourseas has a brilliant future saveourseas has a brilliant future saveourseas's Avatar
    Join Date
    May 2005
    Location
    New York NY, Los Angeles CA, Dallas TX
    Posts
    713
    Mk15.5, Prism, Prism2

    Ray, Dolphin, Mk15

    Re: That "Unintended Consequences" thing....

    I believe if you can make the surface of the tempstick not smooth, you will introduce turbulence along it's surface, breaking up any gas channeling which might otherwise occur.

    This article may explain some of the characteristics of a gas traveling along smooth and rough surfaces.

    SpringerLink - Journal Article
    "However beautiful the strategy, you should occasionally look at the results." Winston Churchill
    A is A

  7. #7
    RBW Member Bosh is an unknown quantity at this point Bosh's Avatar
    Join Date
    Dec 2006
    Location
    Denmark
    Posts
    126
    Atlantis mCCR

    2 gas Atlantis SCR, Homebuilt

    Re: That "Unintended Consequences" thing....

    A custom central rod with the sensors mounted at different angles is what comes to my mind. With the connection going out the inhale P-port there would be very little trouble filling the scrubber.

    Or a plastic tube with the sensors mounted, that fits outside the original rod.

    What size are the sensors ?

    What about corrosion in this environment ?. All would need to be potted, potting compund needs to be non toxic also at higher temperature.

    I want one too

    Best regards

    Bo

+ Reply to Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts