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<p style="margin-top:0; margin-bottom:0">Item #2 is 100% NEW. The current gas supply system was designed to privide a constant gas flow and a constant differential pressure with respect to ambient or atmospheric pressure. It was not designed to maintain a pressure
setpoint. The gas exhaust bubbler maintains a differential pressure according to the oil level set. The absolute pressure in the detector will vary with atmospheric pressure.<br>
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<p style="margin-top:0; margin-bottom:0">What is the pressure setpoint and normal pressure operating range you now require? Depending on your requirements, it may require a PID loop to operate an exhaust valve to control pressure. If a PID loop is required,
it will add an additional cost for the valve, valve controller, and valve power supply.</p>
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<p style="margin-top:0; margin-bottom:0">Cheers,</p>
<p style="margin-top:0; margin-bottom:0">George<br>
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<div>-- <br>
George Jacobs<br>
<span style="font-family:"Times New Roman",Times,serif">Jefferson Lab (TJNAF)</span><br>
<span style="font-family:"Times New Roman",Times,serif">STE 12</span><br>
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<span style="font-family:"Times New Roman",Times,serif">(office) 757-269-7021</span><br>
<span style="font-family:"Times New Roman",Times,serif">(cell) 757-876-0480</span><br>
<span style="font-family:"Times New Roman",Times,serif">(email) jacobsg@jlab.org</span></div>
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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> Dsg-rtpc <dsg-rtpc-bounces@jlab.org> on behalf of Narbe Kalantarians <narbe@jlab.org><br>
<b>Sent:</b> Thursday, February 14, 2019 11:12 AM<br>
<b>To:</b> Marc Mcmullen<br>
<b>Cc:</b> dsg-rtpc@jlab.org<br>
<b>Subject:</b> Re: [Dsg-rtpc] RTPC Gas Controls Meeting Minutes</font>
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<div class="" style="word-wrap:break-word">Guess it got collapsed somehow.
<div class=""><br class="">
</div>
<div class="">I know that item 1 is already going to be take care of.<br class="">
<div class=""><br class="">
</div>
<div class="">
<blockquote type="cite" class="">
<div class="">
<div class="">1) Obviously we need to log all of the monitored quantities (temperatures, pressures and gas flows) in the CLAS12 data stream.<br class="">
<br class="">
2) There should be a feedback loop that regulates the gas flow to keep the pressure inside the RTPC at a fixed value (set by the operator from an EPICS screen)<br class="">
<br class="">
3) There should be programmable alarm levels (both hi and lo) on all pressures and the gas flow, including the supply pressure (e.g. when the bottle gets close to being empty)<br class="">
<br class="">
4) Drift gas should ONLY be shut off if there is a sudden increase in gas flow indicating a rupture somewhere<br class="">
<br class="">
5) In the case of 4) or if the gas flow / pressure sink BELOW an adjustable level, the HV should be shut down (not the gas flow). This is to prevent sparks if ambient air can enter due to a rupture or due to empty supply bottles<br class="">
</div>
</div>
</blockquote>
<br class="">
<br class="">
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<div class="">
<div class=""><b class="">Narbe Kalantarians, Ph. D.</b></div>
<div class="">
<div class="">Assistant Professor of Physics</div>
<div class="">Virginia Union University, Dept. of Natural Sciences </div>
<div class="">+1-804-257-5617 (VUU)</div>
<div class="">+1-757-269-5566 (JLab)</div>
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<blockquote type="cite" class="">
<div class="">On Feb 14, 2019, at 11:10 AM, Marc Mcmullen <<a href="mailto:mcmullen@jlab.org" class="OWAAutoLink" id="LPlnk227816" previewremoved="true">mcmullen@jlab.org</a>> wrote:</div>
<br class="x_Apple-interchange-newline">
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Hi Narbe,</div>
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<br class="">
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There was no attachment or information on your email.</div>
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Marc</div>
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<font class="" style="font-size:11pt" face="Calibri, sans-serif"><b class="">From:</b><span class="x_Apple-converted-space"> </span>Narbe Kalantarians<br class="">
<b class="">Sent:</b><span class="x_Apple-converted-space"> </span>Thursday, February 14, 2019 11:06 AM<br class="">
<b class="">To:</b><span class="x_Apple-converted-space"> </span>Marc Mcmullen<br class="">
<b class="">Cc:</b><span class="x_Apple-converted-space"> </span><a href="mailto:dsg-rtpc@jlab.org" class="OWAAutoLink" id="LPlnk668859" previewremoved="true">dsg-rtpc@jlab.org</a><br class="">
<b class="">Subject:</b><span class="x_Apple-converted-space"> </span>Fwd: RTPC Gas Controls Meeting Minutes</font>
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Hi Marc,
<div class=""><br class="">
</div>
<div class="">Please see below for input for alarms/interlocks re: drift gas system. The ODU group will give (further) input on alarm need for the drift monitoring system.</div>
<div class=""><br class="">
</div>
<div class="">Also; if Nathan Baltzell isn’t no this mailing list, can you add him?</div>
<div class=""><br class="">
</div>
<div class="">Thank you.</div>
<div class=""> <br class="">
<div class="">
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<div class="">
<div class=""><b class="">Narbe Kalantarians, Ph. D.</b></div>
<div class="">
<div class="">Assistant Professor of Physics</div>
<div class="">Virginia Union University, Dept. of Natural Sciences </div>
<div class="">+1-804-257-5617 (VUU)</div>
<div class="">+1-757-269-5566 (JLab)</div>
</div>
</div>
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<div class="">Begin forwarded message:</div>
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<div class="" style="margin:0px"><span class="" style=""><b class="">From:<span class="x_Apple-converted-space"> </span></b></span><span class="">"Kuhn, Sebastian E." <<a href="mailto:skuhn@odu.edu" class="OWAAutoLink" id="LPlnk467349" previewremoved="true">skuhn@odu.edu</a>><br class="">
</span></div>
<div class="" style="margin:0px"><span class="" style=""><b class="">Subject:<span class="x_Apple-converted-space"> </span></b></span><span class=""><b class="">Re: RTPC Gas Controls Meeting Minutes</b><br class="">
</span></div>
<div class="" style="margin:0px"><span class="" style=""><b class="">Date:<span class="x_Apple-converted-space"> </span></b></span><span class="">February 13, 2019 at 2:00:41 PM EST<br class="">
</span></div>
<div class="" style="margin:0px"><span class="" style=""><b class="">To:<span class="x_Apple-converted-space"> </span></b></span><span class="">Narbe Kalantarians <<a href="mailto:narbe@jlab.org" class="OWAAutoLink" id="LPlnk443717" previewremoved="true">narbe@jlab.org</a>><br class="">
</span></div>
<div class="" style="margin:0px"><span class="" style=""><b class="">Cc:<span class="x_Apple-converted-space"> </span></b></span><span class="">"<a href="mailto:christy@jlab.org" class="OWAAutoLink" id="LPlnk695891" previewremoved="true">christy@jlab.org</a>"
<<a href="mailto:christy@jlab.org" class="OWAAutoLink" id="LPlnk115943" previewremoved="true">christy@jlab.org</a>>, "Hattawy, Mohammad" <<a href="mailto:mhattawy@odu.edu" class="OWAAutoLink" id="LPlnk187321" previewremoved="true">mhattawy@odu.edu</a>>, Carlos
Ayerbe Gayoso <<a href="mailto:gayoso@jlab.org" class="OWAAutoLink" id="LPlnk841138" previewremoved="true">gayoso@jlab.org</a>>, "Bueltmann, Stephen L." <<a href="mailto:SBueltma@odu.edu" class="OWAAutoLink" id="LPlnk534065" previewremoved="true">SBueltma@odu.edu</a>><br class="">
</span></div>
<br class="">
<div class="">
<div class="">Here are my 5 cents on these questions:<br class="">
<br class="">
1) Obviously we need to log all of the monitored quantities (temperatures, pressures and gas flows) in the CLAS12 data stream.<br class="">
<br class="">
2) There should be a feedback loop that regulates the gas flow to keep the pressure inside the RTPC at a fixed value (set by the operator from an EPICS screen)<br class="">
<br class="">
3) There should be programmable alarm levels (both hi and lo) on all pressures and the gas flow, including the supply pressure (e.g. when the bottle gets close to being empty)<br class="">
<br class="">
4) Drift gas should ONLY be shut off if there is a sudden increase in gas flow indicating a rupture somewhere<br class="">
<br class="">
5) In the case of 4) or if the gas flow / pressure sink BELOW an adjustable level, the HV should be shut down (not the gas flow). This is to prevent sparks if ambient air can enter due to a rupture or due to empty supply bottles<br class="">
<br class="">
Anything else anyone can think of? - Sebastian<br class="">
<br class="">
<blockquote type="cite" class="">On Feb 13, 2019, at 1:06 PM, Narbe Kalantarians <<a href="mailto:narbe@jlab.org" class="OWAAutoLink" id="LPlnk731273" previewremoved="true">narbe@jlab.org</a>> wrote:<br class="">
<br class="">
Are there any particular details needed for the drift gas system, re: HV/LV failures, other than to shut off the drift gas system?<br class="">
<br class="">
From: Dsg-rtpc <<a href="mailto:dsg-rtpc-bounces@jlab.org" class="OWAAutoLink" id="LPlnk547287" previewremoved="true">dsg-rtpc-bounces@jlab.org</a>> on behalf of Marc Mcmullen <<a href="mailto:mcmullen@jlab.org" class="OWAAutoLink" id="LPlnk756637" previewremoved="true">mcmullen@jlab.org</a>><br class="">
Sent: Thursday, February 7, 2019 4:58 PM<br class="">
To:<span class="x_Apple-converted-space"> </span><a href="mailto:dsg-rtpc@jlab.org" class="OWAAutoLink" id="LPlnk351184" previewremoved="true">dsg-rtpc@jlab.org</a>; Mohammad Hattawy<br class="">
Subject: [Dsg-rtpc] RTPC Gas Controls Meeting Minutes<br class="">
<br class="">
Hi,<br class="">
<br class="">
Attached are the minutes/notes from the meeting with the RTPC/BONuS12 group. The information provided during the meeting has been added to the agenda is in italics.<span class="x_Apple-converted-space"> </span><br class="">
<br class="">
Thanks<br class="">
Marc<br class="">
<RTPC Gas Controls Meeting_020719.docx>_______________________________________________<br class="">
Dsg-rtpc mailing list<br class="">
<a href="mailto:Dsg-rtpc@jlab.org" class="OWAAutoLink" id="LPlnk446070" previewremoved="true">Dsg-rtpc@jlab.org</a><br class="">
<a href="https://mailman.jlab.org/mailman/listinfo/dsg-rtpc" class="OWAAutoLink" id="LPlnk930691" previewremoved="true">https://mailman.jlab.org/mailman/listinfo/dsg-rtpc</a></blockquote>
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