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Alex, all,<br>
</font><br>
On 1/26/2011 9:26 AM, Alexander Eaton wrote:
<blockquote
cite="mid:AANLkTinWCuv9VOQ8K_Gu_zeWu-C_eXbV0-j0RFQ3npWJ@mail.gmail.com"
type="cite">Freddy, <br>
<br>
We have used a diaphragm meter made here (Elster, BK-G 1.6), and
they seem to available in other places as they were recently shown
to work on a biogas project (small scale) in Peru. This systems
has a combination of latex and plastic components that are in
contact with the gas to avoid corrosion. We were able to get good
results below the rated pressure, but at one point I was able to
keep a flame lit, without the gas registering on the meter. That
was at about 5-10 mm of water column, very very low. This systems
costs about $40 US. <br>
</blockquote>
<br>
A web page about the Elster meter is found <a
href="http://www.elster-instromet.com/en/309.html">here</a>, and a
data sheet <a
href="http://www.minerva-intra.com/pdfs/fluid/BK-G1.6%20-%204.pdf">here</a>.<br>
<br>
<br>
<br>
Also, I have put a section about meters from a report, generated for
a client, on my consulting site, <a
href="http://www.vahidbiogas.com/output-measurement-portable.html">here</a>.
(The whole report is regarding a design and use protocol for a
portable substrate testing unit.) I don't think that the information
in the posted excerpt will come as much surprise to anyone on this
list, but there are a number of good links (more than 20) to various
gas meters and related equipment, so I thought I would offer it.<br>
<br>
One meter in particular which might be mentioned is the wet tip gas
meter, the patent for which is found <a
href="http://www.google.com/patents/about?id=M5c8AAAAEBAJ&dq=intitle:gas+ininventor:Speece&as_drrb_ap=q&as_minm_ap=0&as_miny_ap=&as_maxm_ap=0&as_maxy_ap=&as_drrb_is=q&as_minm_is=0&as_miny_is=&as_maxm_is=0&as_maxy_is=&num=100">here</a>.
Whereas the system previously described on the list (if I understood
correctly) relied on recording variable voltage, a meter such as
this one can provide output to a device even less expensive (a
simple battery-operated counter), because it provides a pulse via a
magnetically actuated reed switch each time it fills and trips. This
wet tip meter actually uses the same idea as the MilliGascounter
unit, linked in the excerpt as posted. (Please let me know if you
find any errors or obsolete links.)<br>
<br>
Tipping meters can be made in a wide variety of ways, and, if well
designed, can be very accurate across a wide range of production
rates.<br>
<br>
<br>
d.<br>
<div class="moz-signature">-- <br>
<div style="" ;=""><span style="font-size: 110%;">David William
House<br>
</span>
<div style="padding-left: 3em; font-size: 80%;">"The Complete
Biogas Handbook" <code><a href="www.completebiogas.com">www.completebiogas.com</a></code><br>
<em>Vahid Biogas</em>, an alternative energy consultancy <code><a
href="www.vahidbiogas.com">www.vahidbiogas.com</a><br>
<br>
</code></div>
<div style="padding-left: 2em;">"Make no search for water.
But find thirst,<br>
And water from the very ground will burst."
<div style="padding-left: 2em; font-size: 80%;">(Rumi, a
Persian mystic poet, quoted in <em>Delight of Hearts</em>,
p. 77) <br>
<br>
<a class="moz-txt-link-freetext" href="http://bahai.us/">http://bahai.us/</a></div>
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