<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class="">Hi Peter,</div><div class=""><br class=""></div>Check the tubing for the diffusion pump to the roughing pump. <br class=""><div apple-content-edited="true" class="">
<br class=""><br class="">Walter Stafford<br class=""><a href="mailto:wstafford3@walterstafford.com" class="">wstafford3@walterstafford.com</a><br class=""><br class="">"No problem can withstand the assault of sustained thinking." - Voltaire (1694 - 1778),
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<br class=""><div><blockquote type="cite" class=""><div class="">On Feb 7, 2017, at 17:54, John Philo <<a href="mailto:jphilo@mailway.com" class="">jphilo@mailway.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><meta http-equiv="Content-Type" content="text/html; charset=us-ascii" class=""><meta name="Generator" content="Microsoft Word 15 (filtered medium)" class=""><style class=""><!--
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</o:shapelayout></xml><![endif]--><div lang="EN-US" link="blue" vlink="purple" class=""><div class="WordSection1"><p class="MsoNormal" style="margin-bottom:6.0pt"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:blue" class="">Okay, then yes I’d say you definitely have a leak. If you haven’t removed the flash lamp or messed with the photomultiplier tube recently (things that could produce a vacuum leak) then one possibility is that some object has fallen onto the top of the chamber, under the sliding door, that is preventing the door from dropping down completely onto the O-ring to make the seal. (We’ve seen this happen.) Also try to clean the underside of the sliding door too as best you can.<o:p class=""></o:p></span></p><p class="MsoNormal" style="margin-bottom:6.0pt"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:blue" class="">‘Hope this helps,<o:p class=""></o:p></span></p><div class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:blue" class="">John<o:p class=""></o:p></span></div><div class=""><div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in" class=""><div class="MsoNormal"><b class="">From:</b> Prevelige, Peter Edward, Jr [<a href="mailto:prevelig@uab.edu" class="">mailto:prevelig@uab.edu</a>] <br class=""><b class="">Sent:</b> Tuesday, February 07, 2017 2:38 PM<br class=""><b class="">To:</b> <a href="mailto:jphilo@mailway.com" class="">jphilo@mailway.com</a><br class=""><b class="">Subject:</b> Re: [RASMB] Vacuum Problem Troubleshooting<o:p class=""></o:p></div></div></div><div class="MsoNormal"><o:p class=""> </o:p></div><div class=""><div class="MsoNormal">On as far as I know. Set speed to 0 and start <br class=""><br class="">Sent from my iPhone<span style="font-family:"Times New Roman",serif" class=""><o:p class=""></o:p></span></div></div><div class=""><p class="MsoNormal" style="margin-bottom:12.0pt"><br class="">On Feb 7, 2017, at 4:34 PM, John Philo <<a href="mailto:jphilo@mailway.com" class="">jphilo@mailway.com</a>> wrote:<o:p class=""></o:p></p></div><blockquote style="margin-top:5.0pt;margin-bottom:5.0pt" class="" type="cite"><div class=""><div class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:blue" class="">Peter, do you mean it only gets down to 55 microns with the diffusion pump <b class="">on</b> or <b class="">off</b>?</span><o:p class=""></o:p></div><div class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:blue" class="">John</span><o:p class=""></o:p></div><div class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:blue" class=""> </span><o:p class=""></o:p></div><div class=""><div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in" class=""><div class="MsoNormal"><b class="">From:</b> RASMB [<a href="mailto:rasmb-bounces@list.rasmb.org" class="">mailto:rasmb-bounces@list.rasmb.org</a>] <b class="">On Behalf Of </b>Prevelige, Peter Edward, Jr<br class=""><b class="">Sent:</b> Tuesday, February 07, 2017 2:28 PM<br class=""><b class="">To:</b> <a href="mailto:rasmb@rasmb.org" class="">rasmb@rasmb.org</a><br class=""><b class="">Subject:</b> [RASMB] Vacuum Problem Troubleshooting<o:p class=""></o:p></div></div></div><div class="MsoNormal"> <o:p class=""></o:p></div><div class="MsoNormal">Hi All<o:p class=""></o:p></div><div class="MsoNormal"> <o:p class=""></o:p></div><div class="MsoNormal">Our XL-A is having problems achieving vacuum. It pumps down quickly to about 100 micron, then slowly down to about 55 micron where it stalls. Can anybody give me hints on how to go about troubleshooting the vacuum system. I’ve cleaned the chamber and cleaned and regreased the door seal. <o:p class=""></o:p></div><div class="MsoNormal"> <o:p class=""></o:p></div><div class="MsoNormal">Thanks<o:p class=""></o:p></div><div class="MsoNormal"> <o:p class=""></o:p></div><div class="MsoNormal">Peter<o:p class=""></o:p></div><div class="MsoNormal"> <o:p class=""></o:p></div><div class="MsoNormal"><span style="font-size:10.0pt;color:#1F497D" class="">Peter E. Prevelige Jr.</span><o:p class=""></o:p></div><div class="MsoNormal"><span style="font-size:10.0pt;color:#1F497D" class="">Professor</span><o:p class=""></o:p></div><div class="MsoNormal"><span style="font-size:10.0pt;color:#1F497D" class="">Dept. of Microbiology, BBRB 416/6</span><o:p class=""></o:p></div><div class="MsoNormal"><span style="font-size:10.0pt;color:#1F497D" class="">Univ. of Alabama @ Birmingham</span><o:p class=""></o:p></div><div class="MsoNormal"><span style="font-size:10.0pt;color:#1F497D" class="">845 19th St. South</span><o:p class=""></o:p></div><div class="MsoNormal"><span style="font-size:10.0pt;color:#1F497D" class="">Birmingham AL. 35294-2170</span><o:p class=""></o:p></div><div class="MsoNormal"><span style="font-size:10.0pt;color:#1F497D" class="">Phone 205 975-5327</span><o:p class=""></o:p></div><div class="MsoNormal"><span style="font-size:10.0pt;color:#1F497D" class="">FAX 205 975-5479</span><o:p class=""></o:p></div><div class="MsoNormal"><span style="font-size:10.0pt;color:#1F497D" class=""><a href="mailto:prevelig@uab.edu" class="">prevelig@uab.edu</a></span><o:p class=""></o:p></div><div class="MsoNormal"><span style="font-size:10.0pt;color:#1F497D" class=""><a href="http://www.preveligelab.org/" class="">http://www.preveligelab.org</a></span><o:p class=""></o:p></div><div class="MsoNormal"><span style="font-size:10.5pt;font-family:Consolas;color:#1F497D" class=""> </span><o:p class=""></o:p></div><div class="MsoNormal"> <o:p class=""></o:p></div></div></blockquote></div></div>_______________________________________________<br class="">RASMB mailing list<br class=""><a href="mailto:RASMB@list.rasmb.org" class="">RASMB@list.rasmb.org</a><br class="">http://list.rasmb.org/listinfo.cgi/rasmb-rasmb.org<br class=""></div></blockquote></div><br class=""></body></html>