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<p class="MsoNormal"><span style="font-size:11.0pt">Nathan,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> Some, if not most SRD’s have a N2 driven venturi that keeps the ferrofluidic rotor seal at some level of vacuum for when the seal ultimately fails. This is an effort to eliminate particles from contaminating
the bowl when it occurs. The fix would be to switch the venturi feed to CDA which is quite less expensive but be careful that the N2 does not share the same feed as the bowl purge.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Interlocking the N2 with your lab software is a good way to reduce the N2 consumption but you must find a way to bleed
<i>some </i>N2 into the bowl at idle. The N2 keeps the room’s RH from clinging to the interior parts of the bowl which will drastically increase the time of rinsing to a resistance setpoint because of the water vapor in air not being deionized.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I hope this helps,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> Equipment Dood<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:14.0pt;mso-ligatures:none">Steve Paolini<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt;mso-ligatures:none">Principal Equipment Engineer<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt;mso-ligatures:none">Harvard University Center for Nanoscale Systems<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt;mso-ligatures:none">11 Oxford St.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt;mso-ligatures:none">Cambridge, MA 02138<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt;mso-ligatures:none">617- 496- 9816<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt;mso-ligatures:none">spaolini@cns.fas.harvard.edu<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt;mso-ligatures:none">www.cns.fas.harvard.edu</span><span style="font-size:14.0pt;mso-ligatures:none"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;mso-ligatures:none">From:</span></b><span style="font-size:11.0pt;mso-ligatures:none"> labnetwork <labnetwork-bounces@mtl.mit.edu>
<b>On Behalf Of </b>Nathan Nelson - Fitzpatrick<br>
<b>Sent:</b> Wednesday, April 05, 2023 2:47 PM<br>
<b>To:</b> labnetwork@mtl.mit.edu<br>
<b>Subject:</b> [labnetwork] N2 consumption by SRDs<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Hi labnetwork,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">My lab is going through a process of auditing our Nitrogen use, and an early target for saving on N<sub>2</sub> are our spin rinse dryers.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">We have four Sitek SRDs which are configured to continuously purge with N<sub>2</sub> and to run occasionally (on a timer) to exercise the SRDs and run some DI water through them. The constant N2 purge obviously
consumes a ton of N<sub>2</sub>.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">We’re considering either:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo3"><span style="font-size:11.0pt">Purchasing an (expensive) valve from Sitek that would cut off N<sub>2</sub> flow when the SRD controllers are off. We would then leave the SRD controllers
off when they are not enabled by our lab users.<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo3"><span style="font-size:11.0pt">Or we might consider setting up an interlock to drive a solenoid valve that would cut off N<sub>2</sub> flow to the SRDs when they are not enabled in
our lab management software.<o:p></o:p></span></li></ul>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I’m wondering what other interesting solutions people have fashioned to reduce N<sub>2</sub> consumption by SRDs?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I’m also curious if there are any pitfalls we should look out for when pursuing something like this?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Many thanks in advance,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> -Nathan<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Times New Roman",serif;mso-ligatures:none">-- <o:p></o:p></span></p>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:black;mso-ligatures:none">Nathan Nelson-Fitzpatrick PhD, PEng (He/Him)</span><span style="font-size:10.0pt;font-family:"Times New Roman",serif;color:black;mso-ligatures:none"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:black;mso-ligatures:none">Director, Quantum-Nano Fabrication and Characterization Facility (QNFCF)</span><span style="font-size:10.0pt;font-family:"Times New Roman",serif;color:black;mso-ligatures:none"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:black;mso-ligatures:none">Office of Research</span><span style="font-size:10.0pt;font-family:"Times New Roman",serif;color:black;mso-ligatures:none"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:black;mso-ligatures:none">University of Waterloo</span><span style="font-size:10.0pt;font-family:"Times New Roman",serif;color:black;mso-ligatures:none"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:black;mso-ligatures:none">200 University Avenue West, Waterloo, ON N2L 3G1</span><span style="font-size:10.0pt;font-family:"Times New Roman",serif;color:black;mso-ligatures:none"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:black;mso-ligatures:none">P: 519-888-4567 ext. 31796</span><span style="font-size:10.0pt;font-family:"Times New Roman",serif;color:black;mso-ligatures:none"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:black;mso-ligatures:none">C: 226-218-3206</span><span style="font-size:10.0pt;font-family:"Times New Roman",serif;color:black;mso-ligatures:none"><o:p></o:p></span></p>
<p class="MsoNormal"><a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__uwaterloo.ca_quantum-2Dnano-2Dfabrication-2Dand-2Dcharacterization-2Dfacility_&d=DwMF-g&c=WO-RGvefibhHBZq3fL85hQ&r=-H4Z_jeDfTYjnKPXor15vLwzBllmg8gFrb9m_k9OGks&m=Hw1ZipObTiphqEmRsr0LG8OVf8wNAEz1G7wcA6v_9W5q5Ejcfb4joqLTdW1t3lIX&s=Uhcudj8awnz54h2Vl741rUu7vI9-AxtDfiGUi7eX924&e="><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;mso-ligatures:none">https://uwaterloo.ca/quantum-nano-fabrication-and-characterization-facility/</span></a><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:black;mso-ligatures:none"><o:p></o:p></span></p>
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