[PSUBS-MAILIST] CO2 ppm

[Sean T. Stevenson via Personal_Submersibles]

http://www.analox.net/proddetail.php?productid=266&ref=19


On June 7, 2014 6:07:01 PM MDT, via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>Does anyone know of a O2 and CO2 meter that you can buy off the shelf?
>
> 
>
>Thanks,
>
>Scott Waters 
>
> 
>
>-------- Original Message --------
>Subject: Re: [PSUBS-MAILIST] CO2 ppm
>From: "Sean T. Stevenson via Personal_Submersibles"
><personal_submersibles at psubs.org>
>Date: Sat, June 07, 2014 4:39 pm
>To: Personal Submersibles General Discussion
><personal_submersibles at psubs.org>
>
>Hank, 0.5% by volume is your maximum allowable, which is 5000 ppm, so
>technically that reading is okay; however if that is steady state, it
>doesn't provide a lot of margin for error.  How are you measuring the
>CO2?  I would check the calibration of the transducer, and also check
>that in an elevated CO2 environment (unmanned), turning the scrubber on
>will bring the level down to ~0 after some period of time.  The
>scrubber needs to keep up with the worst-case breathing / metabolism
>rate of the occupants.  Under ideal conditions (low stress, low
>exertion, fresh scrubber media), the scrubber should be capable of
>keeping the CO2 level at the low end of the allowable range.  A slow
>and steady climb in level is your indication that the media is becoming
>exhausted - you don't want to lose that early warning by operating
>close to maximum.
>
>Sean
>
>
>On 2014-06-07 17:26, hank pronk via Personal_Submersibles wrote:
>
>I am heading to Slocan Lake tomorrow for work and a sub dive.  Today I
>did another life support test and the best I can do is 3700 ppm CO2, I
>think the absorbent is not so good or something.  Is 3700ppm good to
>go.
>
>Hank
>
>
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