<html>
<head>
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
</head>
<body bgcolor="#FFFFFF" text="#000000">
<div class="moz-cite-prefix">Just for reference, the level of CO2 in
atmospheric air as of 2014 is about 400 ppm.<br>
<br>
Sean<br>
<br>
<br>
On 2014-06-07 17:39, Sean T. Stevenson via Personal_Submersibles
wrote:<br>
</div>
<blockquote cite="mid:5393A2AA.10601@telus.net" type="cite">
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
<div class="moz-cite-prefix">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.<br>
<br>
Sean<br>
<br>
<br>
On 2014-06-07 17:26, hank pronk via Personal_Submersibles wrote:<br>
</div>
<blockquote
cite="mid:1402183603.41644.YahooMailNeo@web125401.mail.ne1.yahoo.com"
type="cite">
<div style="color:#000; background-color:#fff;
font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial,
Lucida Grande, sans-serif;font-size:12pt">
<div>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.</div>
<div>Hank<br>
</div>
</div>
</blockquote>
<br>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
Personal_Submersibles mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a>
<a class="moz-txt-link-freetext" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a>
</pre>
</blockquote>
<br>
</body>
</html>