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<p class="MsoNormal"><span style="color:#1F497D">Hi George,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">We have been using N2 flow meters for the last 4 years here at Draper, they are totalizing flow meters from Sage Metering, model SRG-100. The units are located on the main trunk lines to 5 different labs.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">The meters cost about $4K each, they use a RF comms link to report back to a central unit. We had a bypass installed on each meter so we can calibrate the meters without shutting of the lab space. The install
cost per meter was around $2500 for each meter. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">So each lab is billed on a monthly basis for the N2 that they use. So we know how much N2 was delivered. we know how much total was used (central unit report). We then divide the cost per month by the CFM delivered
gets us $/CFM. Then each lab pays for CFM usage, and since we use the $$ delivered price everyone shares in the boil off amount.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Rick<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Rick Morrison<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Senior Member Technical Staff <o:p>
</o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Group Leader Microfabrication Operations<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Draper Laboratory<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">555 Technology Square<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Cambridge, MA 02139<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">W 617-258-3420<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">C 508-930-3461<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> labnetwork-bounces@mtl.mit.edu [mailto:labnetwork-bounces@mtl.mit.edu]
<b>On Behalf Of </b>George P. Watson<br>
<b>Sent:</b> Wednesday, June 27, 2012 4:15 PM<br>
<b>To:</b> labnetwork@mtl.mit.edu<br>
<b>Subject:</b> [labnetwork] Nitrogen Gas Flow Meters<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:black">Dear Labnetwork members,<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:black">Our engineering school Nitrogen cost has risen dramatically and our method of dividing the cost (mostly guessing everyone’s usage) has become outdated.
We would like to meter each lab and facility to more fairly assign the cost. Has anyone had experience installing and using these meters?
<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:black">Can you recommend a meter capable of maintaining the N2 purity? How much does such a meter cost, and how much is installation and hookup for remote readout?
<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:black">What happens if there is a wide range of N2 flow rate, both from lab to lab, and at various times within one lab? Will one meter meet our needs?
<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:black">How do you monitor the N2 use? Do you read flow totals from the units themselves, or are they connected to a network?
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">Thanks in advance,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black">Pat<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">George Patrick Watson (Pat), Ph.D.</span><span style="font-size:12.0pt;font-family:"Times New Roman","serif""><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Director of Operations</span><span style="font-size:12.0pt;font-family:"Times New Roman","serif""><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">PRISM Micro/Nano Fabrication Laboratory</span><span style="font-size:12.0pt;font-family:"Times New Roman","serif""><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">E-Quad J301A</span><span style="font-size:12.0pt;font-family:"Times New Roman","serif""><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Princeton University</span><span style="font-size:12.0pt;font-family:"Times New Roman","serif""><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Princeton, NJ 08544</span><span style="font-size:12.0pt;font-family:"Times New Roman","serif""><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""><a href="mailto:gwatson@princeton.edu">gwatson@princeton.edu</a></span><span style="font-size:12.0pt;font-family:"Times New Roman","serif""><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">(609) 258 4626</span><o:p></o:p></p>
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