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Hi Ching,</div>
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So the Regulator Output Pressure signal (pressure after the regulator, before all SBS flow meters) is alive and visible from the WEDM display. No other values for the SBS are alive or valid (for instance the Input pressure or all the channel flows). I have
visually verified the channel flows on the flow meters.</div>
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We will work on this issue after the break, we may have to either come up with a new I2C signal extender or figure out how ECAL is using their Raspberry Pis.</div>
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For now, as long as you have pressure and it is changing, the system has pressure...therefore all the channels for the SBS will have whatever flow the flow meters are set at.</div>
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Regards,</div>
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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> Ching Him Leung <cleung@jlab.org><br>
<b>Sent:</b> Wednesday, December 18, 2024 2:22 PM<br>
<b>To:</b> Marc Mcmullen <mcmullen@jlab.org>; Holly Szumila-Vance via Dsg-halla_gem <dsg-halla_gem@jlab.org>; Ellen Becker <ebecker@jlab.org><br>
<b>Subject:</b> Re: SBS GEM gas monitoring stopped</font>
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<div>Hi Marc </div>
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<div>Thank you for the update. Please keep us posted on the status.</div>
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<div>Ching Him </div>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Marc Mcmullen <mcmullen@jlab.org><br>
<b>Sent:</b> Wednesday, December 18, 2024 1:37 PM<br>
<b>To:</b> Ching Him Leung <cleung@jlab.org>; Holly Szumila-Vance via Dsg-halla_gem <dsg-halla_gem@jlab.org>; Ellen Becker <ebecker@jlab.org><br>
<b>Subject:</b> Re: SBS GEM gas monitoring stopped</font>
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Hi Ching,</div>
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This connector on the I2C extender board set could be or part of the issue the SBS Raspberry Pi cannot see the I2C components downstream so the monitoring program will not start.</div>
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I checked Hall A's I2C storage locker to see if there was a spare, but could not find one. These boards were developed by Hall A, so if there are no spares or this one can not be repaired, we will have to find another solution after the holidays.</div>
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Since you will not be using the detector during the break, I will try to make sure the pressure to the SBS is displayed so that you can monitor it from remote. The SBS/BB flow monitoring is not a controls system. All the flow meters are manual, so they will
stay set to the position you leave them at. As long as the flow meters have pressure they will supply gas.</div>
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I'll update the mailing list later today or tomorrow with the status.</div>
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Ellen,</div>
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If you want to check out the board with the loose connector, it is still in the Hall on the SBS/BB rack. It is the one with nothing plugged into it.</div>
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Marc</div>
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<div id="x_x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Ching Him Leung <cleung@jlab.org><br>
<b>Sent:</b> Wednesday, December 18, 2024 9:48 AM<br>
<b>To:</b> Marc Mcmullen <mcmullen@jlab.org>; Holly Szumila-Vance via Dsg-halla_gem <dsg-halla_gem@jlab.org><br>
<b>Subject:</b> Re: SBS GEM gas monitoring stopped</font>
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<div>Hi Marc</div>
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<div>I don't know whether this is a problem. But I noticed a connector seems to be damaged. </div>
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<div>Ching Him </div>
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<div id="x_x_x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Marc Mcmullen <mcmullen@jlab.org><br>
<b>Sent:</b> Wednesday, December 18, 2024 7:42 AM<br>
<b>To:</b> Ching Him Leung <cleung@jlab.org>; Holly Szumila-Vance via Dsg-halla_gem <dsg-halla_gem@jlab.org><br>
<b>Subject:</b> Re: SBS GEM gas monitoring stopped</font>
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<div dir="ltr">I’ll check it out when I go to the lab. <span id="x_x_x_x_ms-outlook-ios-cursor"></span></div>
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<div id="x_x_x_x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Ching Him Leung <cleung@jlab.org><br>
<b>Sent:</b> Tuesday, December 17, 2024 11:31:20 PM<br>
<b>To:</b> Marc Mcmullen <mcmullen@jlab.org>; Holly Szumila-Vance via Dsg-halla_gem <dsg-halla_gem@jlab.org><br>
<b>Subject:</b> SBS GEM gas monitoring stopped</font>
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Hi Marc</div>
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I noticed that the SBS GEM gas monitoring webpage is not working. I tried to restart the program on dsg-dev-sbc5 following your instructions. But the program would not start. Do you have any suggestions?</div>
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Thank you</div>
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Ching Him</div>
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