<html><body><div style="font-family: tahoma,new york,times,serif; font-size: 14pt; color: #009900"><div><div>hi george,<br></div><div>thanks for the excellent explanation about the saturation curve, it is most useful.</div><div>since we, the dsg, have chased our tails on this issue for quite a while, i suggest that you come up with a set of conditions for the gas, temp, and pressure something like;</div><ol><li>gas temp T<span style="font-size: 8pt;" data-mce-style="font-size: 8pt;">gas</span>>70F</li><li>gas inlet pressure P<span style="font-size: 8pt;" data-mce-style="font-size: 8pt;">in</span> : 20 psig<P<span style="font-size: 8pt;" data-mce-style="font-size: 8pt;">in</span><25psig</li><li>gas oulet pressure P<span style="font-size: 8pt;" data-mce-style="font-size: 8pt;">out</span> : 15 psig<P<span style="font-size: 8pt;" data-mce-style="font-size: 8pt;">out</span><16psig</li><li>MFC temperature T<span style="font-size: 8pt;" data-mce-style="font-size: 8pt;">MFC </span>: 50F<T<span style="font-size: 8pt;" data-mce-style="font-size: 8pt;">MFC <span style="font-size: 14pt;" data-mce-style="font-size: 14pt;"><122F</span></span></li></ol><div><span style="font-size: 8pt;" data-mce-style="font-size: 8pt;"><span style="font-size: 14pt;" data-mce-style="font-size: 14pt;">once these conditions have been met we can see how we can work the interface software and controls.</span></span></div><div><span style="font-size: 8pt;" data-mce-style="font-size: 8pt;"><span style="font-size: 14pt;" data-mce-style="font-size: 14pt;"></span></span></div><div><span style="font-size: 8pt;" data-mce-style="font-size: 8pt;"><span style="font-size: 14pt;" data-mce-style="font-size: 14pt;"><br data-mce-bogus="1"></span></span></div><div><span style="font-size: 8pt;" data-mce-style="font-size: 8pt;"><span style="font-size: 14pt;" data-mce-style="font-size: 14pt;">marc and brian,<br data-mce-bogus="1"></span></span></div><div><span style="font-size: 8pt;" data-mce-style="font-size: 8pt;"><span style="font-size: 14pt;" data-mce-style="font-size: 14pt;">as for the seals, i understand nothing.</span></span></div><div><span style="font-size: 8pt;" data-mce-style="font-size: 8pt;"><span style="font-size: 14pt;" data-mce-style="font-size: 14pt;">sounds like mumbo jumbo to me.<br data-mce-bogus="1"></span></span></div><div><span style="font-size: 8pt;" data-mce-style="font-size: 8pt;"><span style="font-size: 14pt;" data-mce-style="font-size: 14pt;">what is the difference between the two seals?<br data-mce-bogus="1"></span></span></div><div><span style="font-size: 8pt;" data-mce-style="font-size: 8pt;"><span style="font-size: 14pt;" data-mce-style="font-size: 14pt;">can you please explain, i'm not an expert in this matter.<br data-mce-bogus="1"></span></span></div><div><span style="font-size: 8pt;" data-mce-style="font-size: 8pt;"><span style="font-size: 14pt;" data-mce-style="font-size: 14pt;">why should <em>kalrez</em> be better?<br data-mce-bogus="1"></span></span></div><div><span style="font-size: 8pt;" data-mce-style="font-size: 8pt;"><span style="font-size: 14pt;" data-mce-style="font-size: 14pt;"><br data-mce-bogus="1"></span></span></div><div><span style="font-size: 8pt;" data-mce-style="font-size: 8pt;"><span style="font-size: 14pt;" data-mce-style="font-size: 14pt;">also, brian and marc, check with george with regards to the gas system, especially with regards to matters like vapor pressure saturation curve, condensation temperature, etc. etc. before you fire off e-mails.<br data-mce-bogus="1"></span></span></div><div><span style="font-size: 8pt;" data-mce-style="font-size: 8pt;"><span style="font-size: 14pt;" data-mce-style="font-size: 14pt;">for DSG, t<em>here is only one expert</em> on the gas system and that is George, you guys might be close but no...remember "a good man know his limitations".<br data-mce-bogus="1"></span></span></div><div><span style="font-size: 8pt;" data-mce-style="font-size: 8pt;"><span style="font-size: 14pt;" data-mce-style="font-size: 14pt;"><br data-mce-bogus="1"></span></span></div><div><span style="font-size: 8pt;" data-mce-style="font-size: 8pt;"><span style="font-size: 14pt;" data-mce-style="font-size: 14pt;">in any case, I think we have been <span style="font-size: 8pt;" data-mce-style="font-size: 8pt;"><span style="font-size: 14pt;" data-mce-style="font-size: 14pt;">futzing around with </span></span>the MVT gas system for way too long and it isn't even on my books?<br data-mce-bogus="1"></span></span></div><div><span style="font-size: 8pt;" data-mce-style="font-size: 8pt;"><span style="font-size: 14pt;" data-mce-style="font-size: 14pt;"><br data-mce-bogus="1"></span></span></div><div><span style="font-size: 8pt;" data-mce-style="font-size: 8pt;"><span style="font-size: 14pt;" data-mce-style="font-size: 14pt;">so marc and brian prepare a simple talk for tomorrow's meeting.<br data-mce-bogus="1"></span></span></div><div><span style="font-size: 8pt;" data-mce-style="font-size: 8pt;"><span style="font-size: 14pt;" data-mce-style="font-size: 14pt;">i really would like to know how you plan to resolve this matter and when you plan to call it quits.<br data-mce-bogus="1"></span></span></div><div><span style="font-size: 8pt;" data-mce-style="font-size: 8pt;"><span style="font-size: 14pt;" data-mce-style="font-size: 14pt;">amrit<br data-mce-bogus="1"></span></span></div><div><br></div></div><div><br></div><hr id="zwchr" data-marker="__DIVIDER__"><div data-marker="__HEADERS__"><b>From: </b>"Marc Mcmullen" <mcmullen@jlab.org><br><b>To: </b>"Bob Miller" <rmiller@jlab.org>, "Brian Eng" <beng@jlab.org>, "Todd Ewing" <jtewing@jlab.org><br><b>Cc: </b>dsg-mvt@jlab.org, dsg-ft@jlab.org<br><b>Sent: </b>Tuesday, January 2, 2018 3:48:02 PM<br><b>Subject: </b>Re: [Dsg-mvt] MVT MFC Heaters<br></div><div><br></div><div data-marker="__QUOTED_TEXT__">Bob,<br><br>We will monitor the enclosure temperature overnight, you may want to <br>make an adjustment to the enclosure temperature control we have seen it <br>peak at 54F and then drop to below 46F before the cycle started again.<br><br>We spoke with Steve Rockwood from MKS, he says there may be issues with <br>the Viton seals, and suggests using Kalrez as a possible alternative. We <br>are waiting for his final suggestion/report.<br><br>Once Todd has the CF4 hooked up we can test that MFC. As far as the <br>C4F10 MFC, the operating range is 10C - 50C, anything outside of that <br>and the unit will not perform to spec. We have seen that with the DC <br>MFCs when the temperature in the Gas Shed dropped below 50F.<br><br>The gas vapor pressure is specified to be 30psi @ 70F. Until we can get <br>the system stable to these numbers, we risk the operation of the MFC.<br><br>Marc<br><br><br>On 1/2/2018 2:17 PM, Bob Miller wrote:<br>> Hey Marc and Brian,<br>><br>> Todd is working on the heaters and insulation for the MFCs. The heat <br>> tape was limited to 5% by George. Todd has increased it to 20% and <br>> will monitor the inside temperature and adjust the heaters as <br>> necessary. The heaters will turn off when the thermostat reaches <br>> temperature anyway. The heat tape is rated at 144 watts, so I am sure <br>> it will be able to heat the MFCs.<br>><br>> Todd will also connect the CF4 bottle.<br>><br>> Regards,<br>><br>> Bob<br>><br><br>-- <br>Marc McMullen<br>Detector Support Group<br>757-269-7738<br><br>_______________________________________________<br>Dsg-mvt mailing list<br>Dsg-mvt@jlab.org<br>https://mailman.jlab.org/mailman/listinfo/dsg-mvt<br></div><div id="SL_balloon_obj" alt="0" style="display: block;"><div id="SL_button" class="SL_ImTranslatorLogo" style="background: rgba(0, 0, 0, 0) url("moz-extension://9a02252d-fe80-4f21-89c6-673418b2428d/content/img/util/imtranslator-s.png") repeat scroll 0% 0%; display: none; opacity: 1; left: 304px; top: 677px;"></div><div id="SL_shadow_translation_result2" style="display: none;"></div><div id="SL_shadow_translator" style="display: none;"><div id="SL_planshet"><div id="SL_arrow_up" style="background: rgba(0, 0, 0, 0) 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