[PSUBS-MAILIST] CO2 ppm

[Sean T. Stevenson via Personal_Submersibles]

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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