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>
<br>Saludos,<br>A<br><br><div class="gmail_quote">On Wed, Jan 26, 2011 at 1:07 AM, Alastair James Ward <span dir="ltr"><<a href="mailto:Alastair.Ward@agrsci.dk" target="_blank">Alastair.Ward@agrsci.dk</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">Hi Freddy,<br>
<br>
I suppose you could measure temperature and pressure and correct your recorded figures?<br>
<br>
I have not used diaphragm meters, I have heard they do not last long but then I have seen some being used for months if not years with a silica gel column fitted upstream of the meter. They are pretty cheap too and sometimes available with digital outputs for online measurement.<br>
<br>
<br>
<br>
Med venlig hilsen / Regards<br>
<font color="#888888">Alastair James Ward<br>
</font><div><div></div><div><br>
<br>
<br>
-----Original Message-----<br>
From: <a href="mailto:digestion-bounces@lists.bioenergylists.org" target="_blank">digestion-bounces@lists.bioenergylists.org</a> [mailto:<a href="mailto:digestion-bounces@lists.bioenergylists.org" target="_blank">digestion-bounces@lists.bioenergylists.org</a>] On Behalf Of <a href="mailto:fwitarsa@umd.edu" target="_blank">fwitarsa@umd.edu</a><br>
Sent: 25. januar 2011 21:57<br>
To: <a href="mailto:digestion@lists.bioenergylists.org" target="_blank">digestion@lists.bioenergylists.org</a><br>
Subject: [Digestion] Biogas meter<br>
<br>
Hi there,<br>
<br>
My name is Freddy Witarsa and I am a student at University of Maryland in the US. We are currently building biodigesters and I am designing the gas collection system. I have a question regarding the biogas meters that could be used for measuring the amount of biogas produced. Currently, we have a chinese model meter JBD2.5-SA. We are hesitant to use it because it is not temperature and pressure compensated. Does anyone have any good suggestions for low-flow gas meter that is pressure and temperature compensated?<br>
<br>
Also, diaphragm meters seems to be ideal for low-flow gas measurement, but I believe it is not ideal for biogas because of the biogas moisture content, which could lead to corrosion of the meter. Does anyone know of diaphragm meters that are built specially for biogas (i.e. with stainless steel etc.)?<br>
<br>
Thank you very much for your help.<br>
<br>
Freddy Witarsa<br>
<br>
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for more information about digestion, see Beginner's Guide to Biogas <a href="http://www.adelaide.edu.au/biogas/" target="_blank">http://www.adelaide.edu.au/biogas/</a><br>
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for more information about digestion, see<br>
Beginner's Guide to Biogas<br>
<a href="http://www.adelaide.edu.au/biogas/" target="_blank">http://www.adelaide.edu.au/biogas/</a><br>
and the Biogas Wiki <a href="http://biogas.wikispaces.com/" target="_blank">http://biogas.wikispaces.com/</a><br>
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</div></div></blockquote></div><br><br clear="all"><br>-- <br>Alexander Eaton<br>Sistema Biobolsa<br>IRRI-Mexico<br>RedBioLAC<br><br>Mex cel: (55) 11522786<br>US cel: 970 275 4505<br><br><a href="mailto:alex@irrimexico.org" target="_blank">alex@irrimexico.org</a><br>
<a href="mailto:alex@sistemabiobolsa.com" target="_blank">alex@sistemabiobolsa.com</a><br><br><a href="http://sistemabiobolsa.com" target="_blank">sistemabiobolsa.com</a><br><a href="http://www.irrimexico.org" target="_blank">www.irrimexico.org</a><br>
<a href="http://www.redbiolac.org" target="_blank">www.redbiolac.org</a><br><br>