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Thread: Shearwater controller at altitude

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    RBW Member atisdell is an unknown quantity at this point atisdell's Avatar
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    Shearwater controller at altitude

    I dive around 5000 feet (1500 meters). When I calibrate my shearwater controller and nerd they calibrate around .85 as a 1.0. Should i change my low and high set points currently .5 low and 1.3 high. Thanks for any advice on the topic.

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    RBW Member EngelenD is a jewel in the rough EngelenD is a jewel in the rough EngelenD is a jewel in the rough EngelenD is a jewel in the rough EngelenD is a jewel in the rough EngelenD is a jewel in the rough EngelenD is a jewel in the rough EngelenD is a jewel in the rough EngelenD's Avatar
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    Re: Shearwater controller at altitude

    Not sure but I thougt You could change THE attitude ?
    I would send a e-mail to Shearwater , they always respond Quickly


    Sent by my rEvo scrubber using a shearwater Nerd

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    RBW Member EngelenD is a jewel in the rough EngelenD is a jewel in the rough EngelenD is a jewel in the rough EngelenD is a jewel in the rough EngelenD is a jewel in the rough EngelenD is a jewel in the rough EngelenD is a jewel in the rough EngelenD is a jewel in the rough EngelenD's Avatar
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    Re: Shearwater controller at altitude

    Or send one to Pieter or Paul at rEvo , they are also fast ! :)


    Sent by my rEvo scrubber using a shearwater Nerd

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    RBW Member rjack will become famous soon enough rjack will become famous soon enough rjack will become famous soon enough rjack's Avatar
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    Re: Shearwater controller at altitude

    Quote Originally Posted by atisdell  View Original Post
    I dive around 5000 feet (1500 meters). When I calibrate my shearwater controller and nerd they calibrate around .85 as a 1.0. Should i change my low and high set points currently .5 low and 1.3 high. Thanks for any advice on the topic.
    No, physiologically 1.3 is still 1.3. It just will be ever so slightly deeper for the same f02 in the loop.

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    RBW Member sailor is on a distinguished road sailor is on a distinguished road sailor's Avatar
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    Re: Shearwater controller at altitude

    That is normal on 1500 meter as the shearwater is calibrating ppo2 partial pressure, not 02 percentage.
    You will never be able to reach a ppo2 of 1,0 or so on 1500 meter as the ambient pressure on 1500 meter altitude is roughly 850 mbar compared to @ 1000 mbar on sea level.
    That is an ambient pressure of 0,85 bar compared to 1 bar.
    1 bar in pure oxygen generates a ppo2 of 1,0.
    0,85 bar in pure oxygen generates ppo2 of 0,85.



    See here: https://en.wikipedia.org/wiki/Atmospheric_pressure

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