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Thread: Calibration of Cells - Single point - 2 point -Air or O2?

  1. #21
    RBW Member BB1 is an unknown quantity at this point BB1's Avatar
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    Re: Calibration of Cells - Single point - 2 point -Air or O2?

    Personally I think RBW should ban the tosser!!

    Nothing but noise
    Nothing but bagging out legit manufacturers
    Nothing but PDF's
    And an actual rebreather unit - Nothing.

    Life would be a lot pleasanter without his drivelling crap!

  2. #22
    rEvo's daddy
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    Re: Calibration of Cells - Single point - 2 point -Air or O2?

    Quote Originally Posted by Captain Starfish  View Original Post
    If only we could get Paul and Bruce to agree to a monthly "random fact about stuff" post, it would be a lot less painful for everyone :)
    I'll have a talk with Bruce!

    at the end, the only reason why we take time on these forums, is to expell myths, and at the same time, educate the users:

    better educated users, less incidents, better for the CCR dive community!
    www.rEvo-rebreathers.com
    ...."Yes you have to pre-breathe to activate the scrubber sorb, anyone who says different doesn't know what they are talking about!"...
    .... to get more accurate CO2 injection in the breathing machine we put 2 mass flow controllers in series ...
    .... The noise is a few tens of nano-volts, so DL were able to reduce the output voltage ...
    .... radial scrubbers give longer dwell time than axials...
    .... the earth is flat and ...

  3. #23
    RBW Member Andrewdd is an unknown quantity at this point Andrewdd's Avatar
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    Re: Calibration of Cells - Single point - 2 point -Air or O2?

    Quote Originally Posted by paulraymaekers  View Original Post
    I'll have a talk with Bruce!

    at the end, the only reason why we take time on these forums, is to expell myths, and at the same time, educate the users:

    better educated users, less incidents, better for the CCR dive community!
    I have found the posts very useful Paul. It has forced me to think very hard about the way rebreathers work and the reasons behind the predive checks.

  4. #24

    Re: Calibration of Cells - Single point - 2 point -Air or O2?

    Would like to see a brad vs ****ton

  5. #25
    RBW Member mdma946552 is an unknown quantity at this point mdma946552's Avatar
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    Re: Calibration of Cells - Single point - 2 point -Air or O2?

    Quote Originally Posted by paulraymaekers  View Original Post
    I'll have a talk with Bruce!

    at the end, the only reason why we take time on these forums, is to expell myths, and at the same time, educate the users:

    better educated users, less incidents, better for the CCR dive community!
    i see that now to thanks paul and monkey and all the others contributing real facts and rebreathers

  6. #26
    RBW Member bmwgsboy will become famous soon enough bmwgsboy will become famous soon enough bmwgsboy will become famous soon enough bmwgsboy's Avatar
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    Re: Calibration of Cells - Single point - 2 point -Air or O2?

    Quote Originally Posted by deepunderground  View Original Post
    Would like to see a brad vs ****ton
    You read my mind.

  7. #27
    RBW Member Doole is on a distinguished road Doole is on a distinguished road Doole's Avatar
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    Re: Calibration of Cells - Single point - 2 point -Air or O2?

    That would simply result in NSA shutting down the world wide web. On the basis of potential terror against mankind

  8. #28
    RBW Member rian is an unknown quantity at this point rian's Avatar
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    Re: Calibration of Cells - Single point - 2 point -Air or O2?

    My question is, why calibrate at 97% O2 when there isn't 100% O2 in the loop when you are say at 50m? What is the %O2 in the loop at 50m with a setpoint of 1.3ppO?

  9. #29
    Nils Möllerström nilmol will become famous soon enough nilmol will become famous soon enough nilmol will become famous soon enough nilmol will become famous soon enough nilmol's Avatar
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    Re: Calibration of Cells - Single point - 2 point -Air or O2?

    Looking at the title of this thread - Am I the only one thinking that in order to make a calibration one needs at least two checkpoints? And to establish linearity one needs a minimum of three checkpoints? Preferably more than three. To me a single checkpoint is just - a checkpoint...

    /nils

  10. #30
    RBW Member MeRodent will become famous soon enough MeRodent will become famous soon enough MeRodent will become famous soon enough MeRodent's Avatar
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    Calibration of Cells - Single point - 2 point -Air or O2?

    Quote Originally Posted by rian  View Original Post
    My question is, why calibrate at 97% O2 when there isn't 100% O2 in the loop when you are say at 50m? What is the %O2 in the loop at 50m with a setpoint of 1.3ppO?

    You do dive a CCR and have done a course on the unit don't you?

    97% at the surface equates to a ppO2 of 0.97 while the same percent of O2 at 50m would be a ppO2 of 5.82 - remember you are calibrating (and the cells read) the ppO2, it's just that we use a known FO2 at a known pressure to give that known ppO2 reference.

    What you are calibrating and later reading is the number of molecules of O2.
    Last edited by MeRodent; 6th November 2014 at 20:21.

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