<div dir="ltr"><div>Hi Nathan,</div><div><br></div><div>I'm surprised to hear that they have a constant N2 purge. This seems very odd to me. Stating the obvious, here, but can't Sitek reconfigure them? We've had (very old) Verteq Superclean SRD's and now RENA Compass SRD's, and neither type had a constant N2 purge.</div><div><br></div><div>Kyle<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Apr 5, 2023 at 4:15 PM Nathan Nelson - Fitzpatrick <<a href="mailto:nnelsonfitzpatrick@uwaterloo.ca">nnelsonfitzpatrick@uwaterloo.ca</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="msg-3056419218084059775">





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<p class="MsoNormal"><span style="font-size:11pt">Hi labnetwork,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt">My lab is going through a process of auditing our Nitrogen use, and an early target for saving on N₂ are our spin rinse dryers.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt">We have four Sitek SRDs which are configured to continuously purge with N₂ 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 N₂.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt">We’re considering either:<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt"><u></u> <u></u></span></p>
<ul style="margin-top:0in" type="disc">
<li class="m_-5751207388988767688MsoListParagraph" style="margin-left:0in"><span style="font-size:11pt">Purchasing an (expensive) valve from Sitek that would cut off N₂ flow when the SRD controllers are off.  We would then leave the SRD controllers
 off when they are not enabled by our lab users.<u></u><u></u></span></li><li class="m_-5751207388988767688MsoListParagraph" style="margin-left:0in"><span style="font-size:11pt">Or we might consider setting up an interlock to drive a solenoid valve that would cut off N₂ flow to the SRDs when they are not enabled in
 our lab management software.<u></u><u></u></span></li></ul>
<p class="MsoNormal"><span style="font-size:11pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt">I’m wondering what other interesting solutions people have fashioned to reduce N₂ consumption by SRDs?<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt">I’m also curious if there are any pitfalls we should look out for when pursuing something like this?<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt">Many thanks in advance,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt">  -Nathan<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Times New Roman",serif">-- <u></u><u></u></span></p>
<div>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Verdana",sans-serif;color:black">Nathan Nelson-Fitzpatrick  PhD, PEng   (He/Him)</span><span style="font-size:10pt;font-family:"Times New Roman",serif;color:black"><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Verdana",sans-serif;color:black">Director, Quantum-Nano Fabrication and Characterization Facility (QNFCF)</span><span style="font-size:10pt;font-family:"Times New Roman",serif;color:black"><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Verdana",sans-serif;color:black">Office of Research</span><span style="font-size:10pt;font-family:"Times New Roman",serif;color:black"><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Verdana",sans-serif;color:black">University of Waterloo</span><span style="font-size:10pt;font-family:"Times New Roman",serif;color:black"><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Verdana",sans-serif;color:black">200 University Avenue West, Waterloo, ON  N2L 3G1</span><span style="font-size:10pt;font-family:"Times New Roman",serif;color:black"><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Verdana",sans-serif;color:black">P: 519-888-4567 ext. 31796</span><span style="font-size:10pt;font-family:"Times New Roman",serif;color:black"><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Verdana",sans-serif;color:black">C: 226-218-3206</span><span style="font-size:10pt;font-family:"Times New Roman",serif;color:black"><u></u><u></u></span></p>
<p class="MsoNormal"><a href="https://urldefense.com/v3/__https://uwaterloo.ca/quantum-nano-fabrication-and-characterization-facility/__;!!IBzWLUs!T8PC5-A25plwFv8OVmNvllNdSvKRgMR3IZ7Uqa8wriIGD70Ss_OlZtLE_gGeHoV1YsZKQkIK2pDI8eebEKZad3OVmt7KUGceGrTq$" target="_blank"><span style="font-size:10pt;font-family:"Verdana",sans-serif">https://uwaterloo.ca/quantum-nano-fabrication-and-characterization-facility/</span></a><span style="font-size:10pt;font-family:"Verdana",sans-serif;color:black"><u></u><u></u></span></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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</div></blockquote></div><br clear="all"><br><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div>Kyle Keenan</div><div><br></div><div>Senior Manager - Laboratory Operations<br></div><div>Quattrone Nanofabrication Facility</div><div>University of Pennsylvania</div><div>P: 215-898-7560</div><div>F: 215-573-4925<br></div></div></div>