[PSUBS-MAILIST] scrubber humidity

[hank pronk via Personal_Submersibles]

Hi Sean,
Thank you for the explanation, that is very helpful.  
It might be a good idea to keep the scrubber out of the sub to keep it warm in cold weather.
Hank --------------------------------------------
On Sun, 5/17/15, Sean T. Stevenson via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Subject: Re: [PSUBS-MAILIST] scrubber humidity
 To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
 Received: Sunday, May 17, 2015, 5:30 PM
 
 Hank, the scrubber chemical reaction requires
 water to dissociate the compounds in the scrubber media. The
 reactions actually occur in aqueous solution at the granule
 surfaces. Most scrubber media contains some amount of water
 by weight as supplied, and in addition to isolation from
 atmospheric CO2, scrubber media ships in sealed containers
 to prevent it from drying out completely. As long as you are
 keeping your cabin humidity in the recommended range between
 30% and 70% RH, humidity shouldn't be an issue as far as
 scrubber performance. The other thing to consider is the
 scrubber's temperature.  The chemical reactions are
 more efficient at higher temperature, and if your scrubber
 is cold at the beginning of a dive, it will take some time
 to warm up to an efficient operating range. Fortunately, the
 scrubbing reaction itself is exothermic, which helps. Be
 aware though that a very warm scrubber will drive relative
 humidity down within!
   the
 scrubber bed, so if you have quite dry cabin air to start
 with, a warming scrubber can drive the humidity out of the
 efficient operating range.
 Sean
 
 
 
 
 On May 17, 2015 3:07:16 PM
 MDT, hank pronk via Personal_Submersibles
 <personal_submersibles at psubs.org> wrote:
 Hello,
 Is
 it normal for my scrubber to perform poorly until the
 humidity level inside the sub rises?
 Hank
 
 Personal_Submersibles mailing list
 Personal_Submersibles at psubs.org
 http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
 
 -----Inline Attachment Follows-----
 
 _______________________________________________
 Personal_Submersibles mailing list
 Personal_Submersibles at psubs.org
 http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles