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Tyler,</div>
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Thank you for looking in this.</div>
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I have several remarks.</div>
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The RICH LV is OFF. Take a look to the attached screenshot from my monitor.</div>
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The temperature in EP and N2 volumes is the same.</div>
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The humidity in the EP volume is around 30%.</div>
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We have low humidity in the N2 volume.</div>
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You will find the aerogel t and humidity plots for 2 days as well as N2 flow at the screenshot as well.</div>
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Best regards,</div>
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Valery</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size: 11pt;" data-ogsc=""><b>From:</b> Dsg-rich <dsg-rich-bounces@jlab.org> on behalf of Tyler Lemon <tlemon@jlab.org><br>
<b>Sent:</b> Friday, April 24, 2020 10:24<br>
<b>To:</b> dsg-rich <dsg-rich@jlab.org><br>
<b>Subject:</b> [Dsg-rich] RICH hardware interlock sensor study</font>
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Hello,</div>
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Since at the beginning of this work-from-home period, there was concern about the EP hardware interlock sensors not updating, I took a look today at archived data over the past month.</div>
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MyaPlot charts of archived data are attached.<br>
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I've verified that the EP temperatures (top/first plot) are changing and are following ambient temperatures (bottom/fourth plot) in Hall B.</div>
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Looking at the EP humidity (second plot), they are not changing BUT THIS IS EXPECTED since 1. RICH LV (third plot) is on and keeping the EP hot (higher temperature = lower humidity) and 2. the humidity is so low because the EP is being heated by LV and the
reading is below or at the bottom limit that the sensors are able to read.</div>
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I also took a look at the N2 volume sensors, for the most part, they all look good/as expected. There are a few times where Humidity 6 and 14 increase for a period of time, but the sensors in the same location as those (Humidity 13 for #6 and Humidity 7 for
#14) do not show that behavior, so it probably was a noise/readout glitch. I'll keep an eye on those from now on.</div>
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All in all, all the hardware interlock sensors appear to be working as expected and the cRIOs are updating in EPICS as expected.</div>
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Best regards,</div>
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Tyler<br>
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