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Thread: A new type of CO2 sensor?

  1. #1
    Steve Sprague 4ster is a glorious beacon of light 4ster is a glorious beacon of light 4ster is a glorious beacon of light 4ster is a glorious beacon of light 4ster is a glorious beacon of light 4ster is a glorious beacon of light 4ster is a glorious beacon of light 4ster is a glorious beacon of light 4ster is a glorious beacon of light 4ster is a glorious beacon of light 4ster is a glorious beacon of light 4ster's Avatar
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    A new type of CO2 sensor?

    The Winter 2016 issue of DAN's Alert Diver magazine has an article entitled "Do You Know What You're Breathing? CO2 Sensing in Rebreather Diving" by Michael Menduno.

    Most of it is a good review of the problem and different strategies manufacturers have implemented to try to give a warning of elevated CO2 in the loop. If you have been paying attention here on Rebreather World it is mostly review, except....

    At the end of the article Menduno describes a new sensor by Polestar Technologies that the Navy Experimental Diving Unit (NEDU) is testing for use in oxygen rebreathers. The sensor consists of a small disk of polymer film that changes color when exposed to CO2 in a predictable way and it is not affected by moisture. A white LED illuminates the disk from a sealed pot, in which a digital meter reads it's color. The color value can be converted to the CO2 level of the gas.

    The sensor shows promise in that it should be able to be mounted on the mouthpiece and measure end tidal CO2 on expiration, which is the most important measurement for CCR divers in that it can be used to estimate arterial CO2 levels. Nothing rebreather manufacturers offer to date can do this.

    I hope someone (other than NEDU) is experimenting with this sensor. If it turns out to be a reliable way to measure arterial CO2 this will be a real improvement in safety for rebreather divers.

  2. #2
    RBW Member Packhorse is a glorious beacon of light Packhorse is a glorious beacon of light Packhorse is a glorious beacon of light Packhorse is a glorious beacon of light Packhorse is a glorious beacon of light Packhorse is a glorious beacon of light Packhorse is a glorious beacon of light Packhorse is a glorious beacon of light Packhorse is a glorious beacon of light Packhorse is a glorious beacon of light Packhorse is a glorious beacon of light Packhorse's Avatar
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    Re: A new type of CO2 sensor?

    I wonder what its reaction time is?

  3. #3
    SBOD Pilot Captain Starfish is a glorious beacon of light Captain Starfish is a glorious beacon of light Captain Starfish is a glorious beacon of light Captain Starfish is a glorious beacon of light Captain Starfish is a glorious beacon of light Captain Starfish is a glorious beacon of light Captain Starfish is a glorious beacon of light Captain Starfish is a glorious beacon of light Captain Starfish is a glorious beacon of light Captain Starfish is a glorious beacon of light Captain Starfish is a glorious beacon of light Captain Starfish's Avatar
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    Re: A new type of CO2 sensor?

    And whether it suffers the same issues as fluorescence quenching O2 sensors in the type of environment we are using these things.

  4. #4
    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: A new type of CO2 sensor?

    Hope to hear more about it.

    Best regards,
    Chett. L

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