<html>
<head>
<meta http-equiv="Content-Type" content="text/html;
charset=windows-1252">
</head>
<body text="#000000" bgcolor="#FFFFFF">
<p>Hi Marc,</p>
<p>Just for curiosity, when will you try the death test, the test
with isobutane? :P<br>
I am also very curious about this fluid seen by Todd. Liquid
isobutane? Unlikely considering the temperature of the MFC, no?<br>
</p>
<p>Thanks again for investigating this issue.</p>
<p>Max<br>
</p>
<br>
<div class="moz-cite-prefix">Le 14/12/2017 à 16:25,
<a class="moz-txt-link-abbreviated" href="mailto:mcmullen@jlab.org">mcmullen@jlab.org</a> a écrit :<br>
</div>
<blockquote type="cite"
cite="mid:201712142125.vBELP4E9026036@logbooks.jlab.org">
<meta http-equiv="Content-Type" content="text/html;
charset=windows-1252">
<style type="text/css">
<!--
html{color:#555555;}body{line-height:1.5;font-family:'Trebuchet MS','Helvetica Neue',Arial,Helvetica,sans-serif;font-size:87.5%;}h1{font-size:1.6em;}h2.field-label{display:inline-block;font-size:1em;padding-right:5px;min-width:10em;margin:0.3em;}.problem_report{line-height:1.5;max-width:60em;}fieldset.problem_report.resolved
legend{background-image:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAy0lEQVQ4jWP8//8/AyWAiZACd3f3/xYWFrht+f//P1a84t3e/0obff4rbfT5D1GGXR0LuoEr3+/7X3W4n2gvwA0gVSOKAcqbfPGGpImJCU45JgYGBoa7fpsZ22wLSbadgYGBgRE9GrF55Vf2BYbHjx8zYjWB0ljAcAGGExkZ/0MtwuoCggmJEBh4AzBS4pMnT/7fuXOH4dKlSwwnT56EiwcGBv43MDBgMDExYdDX12eQkZGBhAlyiC5YsOA/AwMDUXjLli3/iYoFQgAA+pSxZrXofD0AAAAASUVORK5CYII=);background-repeat:no-repeat;padding-left:18px;}fieldset.problem_report.needs_attention
legend{background-image:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAABmJLR0QA/wD/AP+gvaeTAAAA9ElEQVR42sWTvUoDQRSFv9wMKWxSBVmzdhZJIwTWv9pyLWxTpbE1kBeJPoLxBazzBgGFKNqlHXAhsITUw1y7sMpmjER0YJrDPWcO556BPzhjYPJjlhfT82LUpxcK6Lo5U0JMgcu56tXy7BQajeBDpkAcAEdz1W6uyrLdYieK2DMmKCArcqczpH/ddc0msy+OkyQJC4h3N0ynx+Q5ALtUNs5q5U+8e+R+VPFi4kjk3NZqd++qUK+TZVnYwSfAOyvejeLXt/2qVG/dYoG1dqseBNco27bs/wXKWhIDB8AhcFLAH4Bn4Al4AUqT7RVC++6mv/JVPwDi3VGzomYvyAAAAABJRU5ErkJggg==);background-repeat:no-repeat;padding-left:18px;}.problem_report div.field-items{display:inline-block;}div.date-vitals p{font-size:87.5%;}a{text-decoration:none;}.Readme a:link,.Readme a:visited,.Readme
a:active{color:red;}
-->
</style>
<div id="center">
<div id="main">
<style>
<!--/*--><![CDATA[/* ><!--*/
div.field-vitals{
margin: 0.5em 0;
}
div.field-vitals .field-type-taxonomy-term-reference {
margin: 0.1em 0;
}
article.comment {
padding-left: 10px;
}
article.comment.odd {
background-color: #EEEEEE;
}
article.comment.even {
background-color: #DDDDDD;
}
div.node-content.logentry table{
width: auto;
border-collapse: collapse;
border-spacing: 0;
border-width: 1px;
}
div.node-content.logentry th{
border: inherit;
}
div.node-content.logentry blockquote{
background-color: #FFFFFF;
}
div.node-content.logentry caption{
font-size: 1em;
font-weight: normal;
}
table.field-vitals{
margin-top: 1em;
margin-bottom: 1em;
font-size: 87.5%;
}
table.field-vitals th{
vertical-align: middle;
text-align: left;
width: 15%;
padding: 0.1em;
}
table.field-vitals td{
vertical-align: middle;
text-align: left;
width: auto;
padding: 0.1em;
}
table.field-vitals td li {
margin-left: 0;
list-style-type: none;
list-style-image: none;
}
table.downtime {
width: 30em;
margin-bottom: 1em;
border: 1px black dotted;
}
table.downtime th {
text-align: center;
}
table.downtime td {
text-align: center;
}
tr.caption th {
border-bottom: none;
}
table.downtime tfoot{
background-color:#EEEEEE;
}
div.field-name-body{
margin: 1em 0;
font-size: 110%;
}
div.date-vitals p{
margin: .1em 0;
}
article div.ctools-collapsible-container{
margin-left: -5px;
clear: both;
}
#comment-form{
margin-left: 5px;
border: graytext outset medium;
-moz-border-radius: 15px;
border-radius: 15px;
padding: 1em;
}
div.comments-form-box {
margin-top: 2em;
margin-bottom: 5em;
}
h3.comment-title {
/* display: none; */
}
p.author-datetime{
font-weight: bold;
}
/*--><!]]>*/
</style>
<article id="node-577429" 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/3504568"
rel="bookmark" moz-do-not-send="true">MVT Mixing
System C4H10 Mass Flow Controller</a> </h1>
</header>
<div class="date-vitals">
<p class="author-datetime"> Lognumber <a
href="https://logbooks.jlab.org/entry/3504568"
class="lognumber" data-lognumber="3504568"
moz-do-not-send="true">3504568</a>. Submitted by <a
href="https://logbooks.jlab.org/user/mcmullen"
moz-do-not-send="true">mcmullen</a> on <time
datetime="2017-12-14T16:21:07-0500" pubdate="pubdate">Thu,
12/14/2017 - 16:21</time>. </p>
<table class="field-vitals">
<tbody>
<tr>
<th>Logbooks: </th>
<td><a href="https://logbooks.jlab.org/book/hbmvt"
moz-do-not-send="true">HBMVT</a></td>
</tr>
<tr>
<th>Entry Makers: </th>
<td>mcmullen, jtewing</td>
</tr>
</tbody>
</table>
</div>
<div class="logentry node-content">
<p>We purged the mix 2 C4H10 mass flow controller with
Argon this morning (venting to atmosphere). During the
disconnection Todd saw a small amount of liquid drain
from the mfc. It responded to flow set points routinely
above 150sccm. Below that value the flow was between 90
- 100sccm, with the internal valve in the closed
position. The mfc was then zeroed by the manufactures
procedure, which specifies that is isolated from flow.
The procedure went as standard, however once the Argon
supply was opened, the ~90-100sccm flow returned. Proper
operation below 150sccm was not achieved.</p>
<p>The gas pad temperature reading was > 50F. The RTD
was being read from inside the enclosure. The MFC
temperature reading was ~32C. Both of the reading were
within operating specs for the mfc.</p>
<p>Around 1pm we swapped it out for the spare, which
tested perfectly in the lab.</p>
<p>Once online we were able to flow Argon to the mfc low
limit of 13.9sccm at the set full scale (1390sccm). Even
a little below that, the mfc did not become unstable
until < 10sccm. We then ran the mix 2 system with
both mfcs, still venting to atmosphere. Again no issues
with either mfc, as long as the C4H10 mfc set point was
> 10sccm.</p>
<p>Tomorrow I will test the bad mfc in the lab to see if I
can dry it out with either N2 or Ar.</p>
</div>
<div class="attachment-box"> </div>
</article>
</div>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
Dsg-mvt mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Dsg-mvt@jlab.org">Dsg-mvt@jlab.org</a>
<a class="moz-txt-link-freetext" href="https://mailman.jlab.org/mailman/listinfo/dsg-mvt">https://mailman.jlab.org/mailman/listinfo/dsg-mvt</a>
</pre>
</blockquote>
<br>
</body>
</html>