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</style><article id="node-662991" class="node node-logentry article ia-n clearfix" role="article"><header class="node-header"><h1 class="node-title">
<a href="https://logbooks.jlab.org/entry/3590099" rel="bookmark">Hall B Dewar Level Probe</a>
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<p class="author-datetime">
Lognumber <a href="https://logbooks.jlab.org/entry/3590099" class="lognumber" data-lognumber="3590099">3590099</a>. Submitted by <a href="https://logbooks.jlab.org/user/kashy">kashy</a> on <time datetime="2018-08-22T10:56:55-0400" pubdate="pubdate">Wed, 08/22/2018 - 10:56</time>. </p>
<table class="field-vitals"><tr><th>Logbooks: </th><td><a href="https://logbooks.jlab.org/book/hblog">HBLOG</a> <a href="https://logbooks.jlab.org/book/clog">CLOG</a></td></tr><tr><th>Entry Makers: </th><td>kashy</td></tr></table></div>
<div class="logentry node-content">
<p>Starting on 8/13 when we had the ESR glitch, the Helium level probe on the 500 Liter stated acting up and has been reading noisey ever since. I looked back at the data and found that while still controlling at setpoint the supply valve has been more open since then. I went down to Hall B just now and changed the AMI135 Helium Level Controller from update to sample and back to update.<br />
The indicated level jumped to 80% with much less noise. It appears we have been overfilling the dewar since that event. The supply valve EV8210 is now closing and supply flow to the hall has dropped by an indicated 1g/s</p>
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<div class="image-wrapper"><img view_mode="elog_email" class="image-style-plentybig" src="cid:a4ba9bcca05c8ba56125271b8e66d390@logbooks.jlab.org" width="946" height="491" alt="" title="Dewar Level and valve position change at event 8/13/18 on 0-100% and pressure on 1200-2000mbar" /></div> <div class="image-wrapper"><img view_mode="elog_email" class="image-style-plentybig" src="cid:218ebaa01900334f190bea2e92b360bb@logbooks.jlab.org" width="946" height="489" alt="" title="Present Dewar Level (shows jump from 60-80) and valve position and flow " /></div> </div>
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