<html><head></head><body text="#000000" bgcolor="#FFFFFF" data-blackberry-caret-color="#00a8df" style="background-color: rgb(255, 255, 255); line-height: initial;"><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);">Dear Paul</div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);"><br></div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);">The book is available from Testo free to download. The device is a Testo 350/454 which is a high end combustion analyser (Tom Miles uses one). </div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);"><br></div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);">The H2 is not calculated from the CO, it is the other way round. The CO is measured also with an electrochemical cell and the reading is compensated using a separate H2 measurement. </div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);"><br></div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);">Regards</div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);">Crispin </div> <div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);"><br style="display:initial"></div> <div style="font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);">>>Q10>>></div> <table width="100%" style="background-color:white;border-spacing:0px;"> <tbody><tr><td colspan="2" style="font-size: initial; text-align: initial; background-color: rgb(255, 255, 255);"> <div id="_persistentHeader" style="border-style: solid none none; border-top-color: rgb(181, 196, 223); border-top-width: 1pt; padding: 3pt 0in 0in; font-family: Tahoma, 'BB Alpha Sans', 'Slate Pro'; font-size: 10pt;"> <div><b>From: </b>Paul Anderson</div><div><b>Sent: </b>Wednesday, September 11, 2013 11:37</div><div><b>To: </b>Discussion of biomass cooking stoves</div><div><b>Cc: </b>Crispin Pemberton-Pigott</div><div><b>Subject: </b>Re: [Stoves] Hydrogen from charcoal</div></div></td></tr></tbody></table><div style="border-style: solid none none; border-top-color: rgb(186, 188, 209); border-top-width: 1pt; font-size: initial; text-align: initial; background-color: rgb(255, 255, 255);"></div><br><div id="_originalContent" style="background-color: rgb(255, 255, 255);">
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<div class="moz-cite-prefix">Dear all,<br>
<br>
Some instruments provide "derived measurements" based on from
calculations from other truer, actual measurements. Could this be
the case of H2 amounts being derived from the CO measurements?
If so (or only mostly so), that would explain the nearly perfect
(>97%) correlation between the two lines on the graph.<br>
<br>
What do we know about the instrument? And specifically how is
H2 detected and quantified? <br>
<br>
This is NOT my forte, so I am just raising the questions and am
open to factual responses.<br>
<br>
Paul<br>
<pre class="moz-signature" cols="72">Doc / Dr TLUD / Prof. Paul S. Anderson, PhD
Email: <a class="moz-txt-link-abbreviated" href="mailto:psanders@ilstu.edu">psanders@ilstu.edu</a>
Skype: paultlud Phone: +1-309-452-7072
Website: <a class="moz-txt-link-abbreviated" href="http://www.drtlud.com">www.drtlud.com</a></pre>
On 9/11/2013 7:17 AM, Crispin Pemberton-Pigott wrote:<br>
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<p class="MsoPlainText">Dear Andrew<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Hydrogen is highly reactive in gaseous
form and influences many electrochemical cells. It is detected
electrically, usually in the CO cell. I agree with Harold that
we should rule out some sort of instrument error, but then the
CO level is compensated for the H2 meaning they both should be
working if the H2 is.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">It remains an interesting problem. <o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Re the town gas, a major step in the
production was to spray the hot coal with water to fracture it
creating CO and H2 in the process (water gas) and when I first
heard that I was amazed.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">What crazy guy thought of that??<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><span style="font-family:Wingdings">J</span>
<o:p></o:p></p>
<p class="MsoPlainText">Crispin<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">>Charcoal stove, was operating, but
"everything was cooled"??? Meaning <o:p></o:p></p>
<p class="MsoPlainText">>that there was no "serious" (as in
glowing red) char in the stove, but <o:p></o:p></p>
<p class="MsoPlainText">>emissions were still coming off,
correct?<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">If this was the case then I would expect
the char would still be undergoing pyrolysis and the higher
tar molecules splitting. As you all know town gas was
originally made by heating coal to drive off CO and H2.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">That these molecules would survive the
combustion is interesting but could simply be the dilution by
other combustion products putting the air:fuel ratio out of
range.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">How does a hydrogen cell sense the
presence of hydrogen i.e. what mechanism is involved in the
measuring instrument?<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">AJH<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
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