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Thread: Diluent MOD

  1. #61
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    Quote Originally Posted by Paulo View Post
    Where does the other 5% He disappear to?
    It's diluted... only 18% oxygen in diluent, at 1.3 setpoint unit brings oxygen % up to 26%, resulting in inert gases been reduced in proportion. Nitrogen is also reduced.

    Dilution is more if you say use heliair like 10/50...
    Last edited by JPTaylor; 25-08-2016 at 11:27 AM.

  2. #62
    Established TDF Member Paulo's Avatar
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    Quote Originally Posted by JPTaylor View Post
    It's diluted... only 18% oxygen in diluent, at 1.3 setpoint unit brings oxygen % up to 26%, resulting in inert gases been reduced in proportion. Nitrogen is also reduced.

    Dilution is more if you say use heliair like 10/50...
    That makes sense. Thanks
    Rememeber anything you read on the internet was probably written by some guy sitting at home in his underpants! Including this !!

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    Quote Originally Posted by Paulo View Post
    Where does the other 5% He disappear to?
    It and the nitrogen is off set by the increase of O2.

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    Thanks for the explanation Morgan. See you in Youghal!

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    Quote Originally Posted by cathal View Post
    Thanks for the explanation Morgan. See you in Youghal!
    Counting the days

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    Hello,

    The question about calculations in rebreathers has been answered. You need to calculate the composition of the loop gas first, then apply the method described in the paper.

    Thanks to all the commentators.

    Simon M

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    Hi Simon
    Again many thanks for the release of the notes on the Gas Density issue. As maths is not my first language is there anyway the calculations for the gas density could be avoided when planning each individual dive by assigning a nominal END for the He% e.g. a He% that gives you a END of 20M for every dive?

    Regards

    Cathal

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    Quote Originally Posted by cathal View Post
    Hi Simon
    Again many thanks for the release of the notes on the Gas Density issue. As maths is not my first language is there anyway the calculations for the gas density could be avoided when planning each individual dive by assigning a nominal END for the He% e.g. a He% that gives you a END of 20M for every dive?

    Regards

    Cathal
    Multideco shows EADD in both OC & CCR mode for diluent.... simples!

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    TDF Member timmoranuk's Avatar
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    My dils have a PO2 of no more than 1.00 at max planned depth. I have three standard dils; 20/35 (40 metre), 15/55 (65 metre) and 10/70 (90 metre). The stand-alone Petrel displays the expected dil PO2 but even my enfeebled brain can calulate this on the basis of 20%, 15% or 10% O2...

  10. #70
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    Quote Originally Posted by timmoranuk View Post
    My dils have a PO2 of no more than 1.00 at max planned depth. I have three standard dils; 20/35 (40 metre), 15/55 (65 metre) and 10/70 (90 metre). The stand-alone Petrel displays the expected dil PO2 but even my enfeebled brain can calulate this on the basis of 20%, 15% or 10% O2...
    Yea Tim the feature on the Petrel is very handy. I like to keep my dil po2 at about 1.00 at depth so it's easy to see the difference with a good flush.
    What I was really wondering was, if people mark their dill mod what do they base it on?


 
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