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Dear Marc,
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<div class="">I don’t think that we HAVE to replace that transducer - I think that its accuracy (which I translate to be around 0.0014 atm or 1.4 mbar) should be (barely) sufficient. Our goal is to establish whether there is any SIGNIFICANT (0.01 atm) pressure
drop between the DMS and the RTPC, and whether the pressure drop is roughly constant over time. The absolute pressure in the DMS is less important. Of course, a transducer with a full range of +/- 50 Torr and 4-5 times higher precision would be preferable,
but not mandatory.</div>
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<div class="">- Sebastian<br class="">
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<div class="">On Jun 4, 2019, at 2:06 PM, Marc Mcmullen <<a href="mailto:mcmullen@jlab.org" class="">mcmullen@jlab.org</a>> wrote:</div>
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Hi Sebastian,</div>
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DSG has completed connections to the valve panel as specified by the drawings George has provided. We have been running some functionality tests to ensure the controls software is reading and controlling the instrumentation properly.<br class="">
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The BONuS 6 detector is not connected to the system.</div>
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During testing we have discovered an issue with the current differential pressure transducer, as it does not have the proper ranger for the set up.<span class="Apple-converted-space"> </span><br class="">
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<span style="font-family: calibri, arial, helvetica, sans-serif; font-size: 12pt; line-height: normal; background-color: rgba(0, 0, 0, 0);" class="">The full scale range of this transducer (MKS 226a) is ± 200 Torr (± ~107.048 iwc).</span></p>
<span style="font-family: calibri, arial, helvetica, sans-serif; font-size: 12pt; line-height: normal; background-color: rgba(0, 0, 0, 0);" class="">The EEL RTPC bubbler is set to ~0.1 (iwc).<span class="Apple-converted-space"> </span></span><span style="font-family: calibri, arial, helvetica, sans-serif; font-size: 12pt; line-height: normal; background-color: rgba(0, 0, 0, 0);" class=""><br class="">
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<span style="font-family: calibri, arial, helvetica, sans-serif; font-size: 12pt; line-height: normal; color: rgb(134, 17, 6); background-color: rgba(0, 0, 0, 0);" class="">The accuracy of<span class="Apple-converted-space"> </span></span><span style="font-family: calibri, arial, helvetica, sans-serif; font-size: 12pt; line-height: normal; background-color: rgba(0, 0, 0, 0);" class=""><span style="line-height: normal;" class=""><span style="line-height: normal; font-family: calibri, arial, helvetica, sans-serif; font-size: 12pt; color: rgb(134, 17, 6); background-color: rgba(0, 0, 0, 0);" class="">this</span></span></span><span style="font-family: calibri, arial, helvetica, sans-serif; font-size: 12pt; line-height: normal; color: rgb(134, 17, 6); background-color: rgba(0, 0, 0, 0);" class=""><span class="Apple-converted-space"> </span>226a
is ± 0.53524 (iwc)</span><span style="font-family: calibri, arial, helvetica, sans-serif; font-size: 12pt; line-height: normal; background-color: rgba(0, 0, 0, 0);" class="">.<span class="Apple-converted-space"> </span><br class="">
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<span style="font-family: calibri, arial, helvetica, sans-serif; font-size: 12pt; line-height: normal; background-color: rgba(0, 0, 0, 0);" class="">Currently, any measurement we read is within the bounds of the accuracy. Could you please provide a pressure
differential specification between the DMS and RTPC (what is expected and what would be extreme). We can then source a suitable component.</span></div>
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<span style="font-family: calibri, arial, helvetica, sans-serif; font-size: 12pt; line-height: normal; background-color: rgba(0, 0, 0, 0);" class=""> You may also wish to consider adding another absolute pressure transducer to provide the actual DMS pressure.<span class="Apple-converted-space"> </span><br class="">
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<span style="font-family: calibri, arial, helvetica, sans-serif; font-size: 12pt; line-height: normal; background-color: rgba(0, 0, 0, 0);" class="">Thanks,</span></div>
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<span style="font-family: calibri, arial, helvetica, sans-serif; font-size: 12pt; line-height: normal; background-color: rgba(0, 0, 0, 0);" class="">Marc</span><br class="">
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<span style="caret-color: rgb(0, 0, 0); font-family: TimesNewRomanPSMT; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">_______________________________________________</span><br style="caret-color: rgb(0, 0, 0); font-family: TimesNewRomanPSMT; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">
<span style="caret-color: rgb(0, 0, 0); font-family: TimesNewRomanPSMT; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">Dsg-rtpc
mailing list</span><br style="caret-color: rgb(0, 0, 0); font-family: TimesNewRomanPSMT; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">
<a href="mailto:Dsg-rtpc@jlab.org" style="font-family: TimesNewRomanPSMT; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class="">Dsg-rtpc@jlab.org</a><br style="caret-color: rgb(0, 0, 0); font-family: TimesNewRomanPSMT; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">
<a href="https://mailman.jlab.org/mailman/listinfo/dsg-rtpc" style="font-family: TimesNewRomanPSMT; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class="">https://mailman.jlab.org/mailman/listinfo/dsg-rtpc</a></div>
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