<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:10pt"><div><span>Hank,</span></div><div style="color: rgb(0, 0, 0); font-size: 13.333333969116211px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-style: normal; background-color: transparent;"><span>have a look at Dr Phils life support paper on psubs, it quotes some limits.</span></div><div style="color: rgb(0, 0, 0); font-size: 13.333333969116211px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-style: normal; background-color: transparent;"><span>There is a time factor variable. ie you can have a higher level for a short time.</span></div><div style="color: rgb(0, 0, 0); font-size: 13.333333969116211px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif;
font-style: normal; background-color: transparent;"><span>If you come to conference brain damaged don't blame me though.</span></div><div style="color: rgb(0, 0, 0); font-size: 13.333333969116211px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-style: normal; background-color: transparent;"><span>The k250s were designed with no life support. Just resurface</span></div><div style="color: rgb(0, 0, 0); font-size: 13.333333969116211px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-style: normal; background-color: transparent;"><span>after an hour.</span></div><div style="color: rgb(0, 0, 0); font-size: 13.333333969116211px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-style: normal; background-color: transparent;"><span>Alan</span></div><div><br></div> <div style="font-family: HelveticaNeue,
'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 10pt;"> <div style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 12pt;"> <div dir="ltr"> <hr size="1"> <font size="2" face="Arial"> <b><span style="font-weight:bold;">From:</span></b> Sean T. Stevenson via Personal_Submersibles <personal_submersibles@psubs.org><br> <b><span style="font-weight: bold;">To:</span></b> Personal Submersibles General Discussion <personal_submersibles@psubs.org> <br> <b><span style="font-weight: bold;">Sent:</span></b> Sunday, June 8, 2014 11:39 AM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] CO2 ppm<br> </font> </div> <div class="y_msg_container"><br><div id="yiv1211567437"><div>
<div class="yiv1211567437moz-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 clear="none">
<br clear="none">
Sean<br clear="none">
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<br clear="none">
On 2014-06-07 17:26, hank pronk via Personal_Submersibles wrote:<br clear="none">
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<div class="qtdSeparateBR"><br><br></div><div class="yiv1211567437yqt5992635460" id="yiv1211567437yqt60457"><blockquote type="cite">
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<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 clear="none">
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</blockquote></div>
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