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Thread: Flow Meters

  1. #1
    Wael AL-Jareh Brainx3 is a jewel in the rough Brainx3 is a jewel in the rough Brainx3 is a jewel in the rough Brainx3 is a jewel in the rough Brainx3 is a jewel in the rough Brainx3 is a jewel in the rough Brainx3 is a jewel in the rough Brainx3's Avatar
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    Flow Meters

    Which type/model do you use on your mCCR/hCCR ?



    Regards. Wael

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    Re: Flow Meters

    With the Dolphin, I used the Dwyer MiniMaster, the same model that came with the Dolphin could be bought directly from dwyer for a fraction of the cost. For mCCR, I use the "Dave ****** inverted graduated cylinder in a bucket of water" method, the output hose from the orifice goes into the water, and bleeds gas over time into a flooded and inverted graduated cylinder. The amount of water displaced, factored with the time of the sample (example: 125ml in 10 seconds= 0.75 liters/min), gives an actual reading of gas volume per minute, without having to worry about whether the calibrations of the flow meter is in air or O2. Seems to have worked well for me so far.
    Quote Originally Posted by Brainx3  View Original Post
    Which type/model do you use on your mCCR/hCCR ?



    Regards. Wael

  3. #3
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    Re: Flow Meters

    I used a Dwyer, can't remember the model number but Gordon lists it in the KISS manual. IIRC it's a 0-2l/min but might be wrong as it's from memory. You will need to correct for oxygen as they are calibrated in air.

    Once you have the flow set then you can check the flow in the field by just timing how long it takes the oxygen lines to depressurise once the oxygen is switched off. It's rough but it's an easy check to do predive.

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    Re: Flow Meters

    ahh for a mCCR/hCCR --> none.

    Get the pressure to match your metabolism, and write down droptime from say 100 to 50 bars. Use this as a ballpark figure during preparation at home.

    I still see this as a "critical" function on a mCCR, and therefor I test it during preparation of the rig at home.
    However, so what if it doesnt?
    We check PPO often enough right......

    Nicolai

  5. #5
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    Re: Flow Meters

    +1 for Dwyer. Mine is an 02 flow meter, so no calculation from air needed.

    below is pic of it.. Albeit not the best photo.. hope it helps..

    John
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    Re: Flow Meters

    I use the Dwyer Model # VFB -60-SS, which you can order directly. Lately thought it's simpler to use an empty Jim Bean 1/5. 750ml,, so 1 minute to fill equals .75lpm flow..........

  7. #7
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    Re: Flow Meters

    I use the Dwyer 1,2 l/m purchased through Tecme. (air model)
    I use it every time doing predive checks.
    If anything is wrong, its easy noticed :
    Flow too high : ball above .. happened to me once due to O² IP creeped up
    Flow too low : filter clogged, re-adjustment of y Swagelock needle valve.

    cheers

    Ivan

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    Re: Flow Meters

    Quote Originally Posted by Ivan Calcoen  View Original Post
    I use the Dwyer 1,2 l/m purchased through Tecme. (air model)
    I use it every time doing predive checks.
    If anything is wrong, its easy noticed :
    Flow too high : ball above .. happened to me once due to O² IP creeped up
    Flow too low : filter clogged, re-adjustment of y Swagelock needle valve.

    cheers

    Ivan

    Second that, I also use a flow meter which i purchased from Martin (tecme)

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    RBW Member venturi is an unknown quantity at this point venturi's Avatar
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    Re: Flow Meters

    Anyone have an idea of the real difference with calibrating 02 with an air meter ?

  10. #10
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    Re: Flow Meters

    Quote Originally Posted by venturi  View Original Post
    Anyone have an idea of the real difference with calibrating 02 with an air meter ?

    I'd estimate that it reads about 5% high.
    That's about 1/4 of the indicator ball's diameter, if that.

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