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Thread: How O2 cells die

  1. #11
    Chett Lehrer Chett.L has much to be proud of Chett.L has much to be proud of Chett.L has much to be proud of Chett.L has much to be proud of Chett.L has much to be proud of Chett.L has much to be proud of Chett.L has much to be proud of Chett.L has much to be proud of Chett.L has much to be proud of Chett.L has much to be proud of Chett.L has much to be proud of Chett.L's Avatar
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    Re: How O2 cells die

    Quote Originally Posted by paulraymaekers  View Original Post
    problem is that with a cell checker you cannot simulate a real dive
    during diving oxygen sensors also exposed to a very strong temperature profile, and to 100% humidity: this does influence the behaviour of current limited sensors
    for that reason also we suggest the check at the end of the dive
    Hi Paul,
    In degrees what is the highest temperature profile the Revo gets to?

    Best regards,
    Chett. L

  2. #12
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    Re: How O2 cells die

    Quote Originally Posted by Chett.L  View Original Post
    Hi Paul,
    In degrees what is the highest temperature profile the Revo gets to?

    Best regards,
    I recall seeing temps of 43 deg C in 15-20 deg C water when I was running my DIY temp stick. This of course was the scrubber not the cells which would have been a bit less.

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    Re: How O2 cells die

    Quote Originally Posted by Chett.L  View Original Post
    Hi Paul,
    In degrees what is the highest temperature profile the Revo gets to?

    Best regards,
    absolute worst case, hanging longtime in very warm water, in very shallow dept, it goes up to 55-60°C at the exit of the scrubber
    your sensors will not be at that temp, but on average they can get higher than 50°C under these conditions
    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 ...

  4. #14
    RBW Member OutOfTest is an unknown quantity at this point OutOfTest's Avatar
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    Re: How O2 cells die

    So, just for an idiot.

    Sensors don't like warm?


    Sent from my iPhone using Tapatalk

  5. #15
    So many CCR So little etc Mark Chase has a reputation beyond repute Mark Chase has a reputation beyond repute Mark Chase has a reputation beyond repute Mark Chase has a reputation beyond repute Mark Chase has a reputation beyond repute Mark Chase has a reputation beyond repute Mark Chase has a reputation beyond repute Mark Chase has a reputation beyond repute Mark Chase has a reputation beyond repute Mark Chase has a reputation beyond repute Mark Chase has a reputation beyond repute Mark Chase's Avatar
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    Re: How O2 cells die

    Test cells at kit assembly

    Flush with 02 to 98+ just before the dive

    Test to 1.8 at 8m during decent

    Run to max depth on low set point and compare cell reading with known PP02 for dill in use

    Spike cells with a little 02 add during the dive

    If in doubt stop and triple dill flush to test cells against known PP02 and monitor on staged return to set point+

    Test cells over 1.6 on ascent (say at first stop depth just before ascent to next stop)

    See if they run 1.6 at 6m by end of dive

    That’s all you can do

    Its likely to be enough and the Wes Skiles of this world didn’t do it.

    Changing cells once a year is not particularly relevant and should in no way be seen as a reason to not check cell health during a dive

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    Thumbs up Re: How O2 cells die

    Quote Originally Posted by Mark Chase  View Original Post
    See if they run 1.6 at 6m by end of dive

    Changing cells once a year is not particularly relevant and should in no way be seen as a reason to not check cell health during a dive

    thanks, best advise!
    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 ...

  7. #17
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    Re: How O2 cells die

    what if you buy cells for example 3 or 4 months after fabrication? does that means you have to replace them after 12 months from fabrication, or 12 months from purchasing them? (I'm at the point that I have to replace cells for the first time since I bought my CCR :) )


    other point: Who is using a "cell log"? at the end of the dives I mostely do indeed a cell check on 1,6 ppO2. I have a logfile where I write all the millivolts from my cell checks. wWould that be usefull or are these useless statistics?

  8. #18
    RBW Member wwjk is an unknown quantity at this point wwjk's Avatar
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    Re: How O2 cells die

    You`re diving a JJ? Best cell log is your Petrel together with Shearwater Desktop.
    Look at the cell readings during O2 spikes, e.g. 1.6 ppO2, and you can see exactly how every cell is reacting.

  9. #19
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    Re: How O2 cells die

    Quote Originally Posted by wwjk  View Original Post
    You`re diving a JJ? Best cell log is your Petrel together with Shearwater Desktop.
    Look at the cell readings during O2 spikes, e.g. 1.6 ppO2, and you can see exactly how every cell is reacting.

    ... as long as you do these tests / spikes also at the end of your dive!
    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 ...

  10. #20
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    Re: How O2 cells die

    Always Over the months you can see then the reduction of the potential and the longer reaction time-time to change...

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