[PSUBS-MAILIST] CO2 ppm

[hank pronk via Personal_Submersibles]

My CO2 measuring device is a simple air quality digital read out thing that is on a desk.  It tells me the humidity and temp and of coarse CO2ppm .   The meter is highly reactive, they claim accurate but who knows.
Hank  


On Sunday, June 8, 2014 9:35:03 AM, Sean T. Stevenson via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
  


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 wr!
 ote:
>> 
>>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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>>
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>
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