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Hi Bob,</div>
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I have requested quotes for the MFCs, from Lesker, using your connection specification (1/2" swagelok compression). I have rfqs for GE50a for 200 sccm and 500 sccm. 200 is a little more than the 170 cc/min you specified for the detector flow. However, I am
not sure if 200 is too much of a limit.</div>
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The specified controlled flow scale for these is 2% of full scale to 100%. The resolution is 0.1% of full scale (see link for
<a href="https://www.mks.com/mam/celum/celum_assets/resources/GE50-DS.pdf?4" id="LPlnk228468" class="OWAAutoLink" title="https://www.mks.com/mam/celum/celum_assets/resources/GE50-DS.pdf?4">
spec. sheet</a>). These are the MFCs we have been working with for years, so communication</div>
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These should be fine for the supply side (15 psi at the regulator) and the return (1050 mbar = ~15 psi) , as long as we can keep the differential at the specification.</div>
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I'll set up a meeting once I get quotes back so we can talk about the system before anything is ordered. A lot of this will depend on stock and lead time.
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Marc</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Bob Miller <rmiller@jlab.org><br>
<b>Sent:</b> Monday, January 22, 2024 7:35 AM<br>
<b>To:</b> Marc Mcmullen <mcmullen@jlab.org>; Marc Mcmullen via dsg-hallb_gas <dsg-hallb_gas@jlab.org><br>
<b>Subject:</b> Re: 2023-12-14 DSG-Hall B ALERT Gas Controls meeting</font>
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Hi Marc,</div>
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The MFC and solenoid valve connections will be 1/2" Swagelok compression fittings, and the pressure sensors will be 1/4" NPT.</div>
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Do you have any questions about the set up or failure modes?</div>
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Thanks,</div>
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Bob</div>
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<div dir="ltr" id="x_divRplyFwdMsg"><span style="font-family:Calibri,sans-serif; font-size:11pt; color:rgb(0,0,0)"><b>From:</b> Marc Mcmullen <mcmullen@jlab.org><br>
<b>Sent:</b> Tuesday, December 19, 2023 3:20 PM<br>
<b>To:</b> Marc Mcmullen via dsg-hallb_gas <dsg-hallb_gas@jlab.org>; Bob Miller <rmiller@jlab.org><br>
<b>Cc:</b> Patrizia Rossi <rossi@jlab.org><br>
<b>Subject:</b> 2023-12-14 DSG-Hall B ALERT Gas Controls meeting</span>
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<p style="margin:0in; font-family:Calibri,sans-serif; font-size:11pt">DSG conducted a meeting to review the plans for the Hall B ALERT gas controls. The meeting minutes can be review at the following link.</p>
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<p style="margin:0in; font-family:Calibri,sans-serif; font-size:11pt"><a href="https://www.jlab.org/sites/default/files/dsg/minutes/Hall%20B%20gas/2023-12-14_Hall%20B%20ALERT%20Gas%20Controls_1.pdf" data-auth="NotApplicable" id="OWA0e3887b9-1c4c-51b3-2eb9-53abb8d422f8" class="x_OWAAutoLink" style="margin-top:0px; margin-bottom:0px">2023-12-14
DSG-Hall B ALERT Gas Controls</a></p>
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