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<div dir="auto">Thanks Brian.</div>
<div dir="auto"><br>
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<div dir="auto">Marc,</div>
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<div dir="auto">I have a few more questions.</div>
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<div dir="auto">1. <span style="font-size: 12pt;">I am still confused about this offset.</span></div>
<div dir="auto">Is the transducer reporting an absolute pressure minus a fixed absolute offset? That seems odd to me. </div>
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<div dir="auto">2. Also, where is the ambient pressure transducer located?</div>
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<div dir="auto">3. What are the pid loop inputs for the automaitc mode? Average pressure, just one transducer or something else?</div>
<div dir="auto"><br>
</div>
<div dir="auto">Thanks,</div>
<div dir="auto">Whit</div>
<div dir="auto"><br>
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<div dir="auto"><br>
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<div dir="auto"><br>
</div>
<div dir="auto"><br>
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<div><br>
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<div dir="auto">Whitney Armstrong</div>
<div dir="auto">Assistant Physicist</div>
<div dir="auto">Physics Division</div>
<div dir="auto">Building 203</div>
<div dir="auto"><br>
</div>
<div dir="auto">Argonne National Laboratory </div>
<div dir="auto">9700 S. Cass Ave. | Argonne, IL 60439</div>
<div dir="auto">630-252-5112 | 717-341-1080 mobile</div>
<div dir="auto">warmstrong@anl.gov </div>
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<div id="divRplyFwdMsg" style="font-size: 11pt;"><strong>From:</strong> Brian Eng <beng@jlab.org><br>
<strong>Sent:</strong> Wednesday, January 15, 2025 4:14:13 PM<br>
<strong>To:</strong> Armstrong, Whitney R. <warmstrong@anl.gov><br>
<strong>Subject:</strong> Fwd: [dsg-hallb_gas] AHDC gas control<br>
</div>
<br>
<div style="visibility: hidden; font-size: 1px; line-height: 1px; height: 0px; max-height: 0px; opacity: 0; overflow: hidden; display: none !important; color: rgb(255, 255, 255);">
I’m not sure you got my previous email or not, so forwarding it directly to you. Begin forwarded message: From: Brian Eng via dsg-hallb_gas <dsg-hallb_gas@ jlab. org> Subject: Re: [dsg-hallb_gas] AHDC gas control Date: January 15, 2025 at</div>
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I’m not sure you got my previous email or not, so forwarding it directly to you.<br>
<div><br>
<blockquote type="cite">
<div>Begin forwarded message:</div>
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<span style="font-family: -webkit-system-font, "Helvetica Neue", Helvetica, sans-serif; color: rgb(0, 0, 0);"><b>From:
</b></span><span style="font-family:-webkit-system-font,Helvetica Neue,Helvetica,sans-serif">Brian Eng via dsg-hallb_gas <dsg-hallb_gas@jlab.org><br>
</span></div>
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<span style="font-family: -webkit-system-font, "Helvetica Neue", Helvetica, sans-serif; color: rgb(0, 0, 0);"><b>Subject:
</b></span><span style="font-family:-webkit-system-font,Helvetica Neue,Helvetica,sans-serif"><b>Re: [dsg-hallb_gas] AHDC gas control</b><br>
</span></div>
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<span style="font-family: -webkit-system-font, "Helvetica Neue", Helvetica, sans-serif; color: rgb(0, 0, 0);"><b>Date:
</b></span><span style="font-family:-webkit-system-font,Helvetica Neue,Helvetica,sans-serif">January 15, 2025 at 1:28:10 PM EST<br>
</span></div>
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<span style="font-family: -webkit-system-font, "Helvetica Neue", Helvetica, sans-serif; color: rgb(0, 0, 0);"><b>To:
</b></span><span style="font-family:-webkit-system-font,Helvetica Neue,Helvetica,sans-serif">Marc Mcmullen via dsg-hallb_gas <dsg-hallb_gas@jlab.org><br>
</span></div>
<div style="margin-top:0px; margin-right:0px; margin-bottom:0px; margin-left:0px">
<span style="font-family: -webkit-system-font, "Helvetica Neue", Helvetica, sans-serif; color: rgb(0, 0, 0);"><b>Reply-To:
</b></span><span style="font-family:-webkit-system-font,Helvetica Neue,Helvetica,sans-serif">Brian Eng <beng@jlab.org><br>
</span></div>
<br>
<div>
<div style="line-break:after-white-space">Hi Whit,
<div><br>
</div>
<div>The control pressure is measured by the transmitter in psig, which is then converted to mbar in software. According to the manufacturer it has a fixed 14.7 psi (so ~1013.529 mbar) offset. If the set point is at 90 mbar it is really ~1103.529 mbar.</div>
<div><br>
</div>
<div>The ambient pressure sensor readout that is being displayed got stuck, rebooting it got the values updating again. The EPICS PV that ALERT is using is B_SYS_WEATHER_FC_L1:Press2 in case you wanted to monitor it directly/separately.</div>
<div><br>
</div>
<div>Let me know if there’s any other questions.</div>
<div><br>
</div>
<div>Brian<br>
<div><br>
<blockquote type="cite">
<div>On Jan 15, 2025, at 12:34 PM, Marc Mcmullen via dsg-hallb_gas <dsg-hallb_gas@jlab.org> wrote:</div>
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<div dir="ltr">
<div dir="ltr">Hi Bob, I’m out sick. So I’m forwarding this tho the group. Brian can probably look into it. </div>
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<div dir="ltr">Also I looked and the input flow to MFC 308 is set to 20 sccm. Maybe change that to 167 sccm. </div>
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<div dir="ltr">Marc</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif"><b>From:</b> Bob Miller <rmiller@jlab.org><br>
<b>Sent:</b> Wednesday, January 15, 2025 11:20 AM<br>
<b>To:</b> Armstrong, Whitney R. <warmstrong@anl.gov>; Marc Mcmullen <mcmullen@jlab.org><br>
<b>Subject:</b> Re: AHDC gas control
<div> </div>
</font></div>
<div class="elementToProof" style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt">
Hi Whitney,</div>
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<br>
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I will refer this question to Marc, as he wrote the controls.</div>
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<div style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt">
Bob Miller</div>
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Hall B Lead Engineer</div>
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(757) 822-9586</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt"><b>From:</b> Armstrong, Whitney R. <warmstrong@anl.gov><br>
<b>Sent:</b> Wednesday, January 15, 2025 10:44 AM<br>
<b>To:</b> Bob Miller <rmiller@jlab.org><br>
<b>Subject:</b> [EXTERNAL] AHDC gas control</font>
<div> </div>
</div>
<div>
<div dir="auto">Hi Bob,</div>
<div dir="auto"><br>
</div>
<div dir="auto">I have a question about the gas control system. When the alert gas set point is set to 90 mbar, what is that relative to in order to provide stable absolute pressure?</div>
<div dir="auto"><br>
</div>
<div dir="auto">Also, the ambient pressure readout appears to not change and is at a value of 1017.54.</div>
<div dir="auto"><br>
</div>
<div dir="auto">Thanks,</div>
<div dir="auto">Whit</div>
<div id="x_ms-outlook-mobile-signature" dir="auto">
<div><br>
</div>
<div dir="auto">Whitney Armstrong</div>
<div dir="auto">Assistant Physicist</div>
<div dir="auto">Physics Division</div>
<div dir="auto">Building 203</div>
<div dir="auto"><br>
</div>
<div dir="auto">Argonne National Laboratory </div>
<div dir="auto">9700 S. Cass Ave. | Argonne, IL 60439</div>
<div dir="auto">630-252-5112 | 717-341-1080 mobile</div>
<div dir="auto">warmstrong@anl.gov </div>
</div>
</div>
</div>
</div>
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