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I'm working on installing the RPi in the EEL. That way we can start reading the transducers.</div>
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Marc<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Dsg-halla_gem <dsg-halla_gem-bounces@jlab.org> on behalf of George Jacobs <jacobsg@jlab.org><br>
<b>Sent:</b> Tuesday, September 28, 2021 1:59 PM<br>
<b>To:</b> Jack Segal <segal@jlab.org>; jboyd@jlab.org <jboyd@jlab.org><br>
<b>Cc:</b> dsg-halla_gem@jlab.org <dsg-halla_gem@jlab.org><br>
<b>Subject:</b> Re: [Dsg-halla_gem] [EXTERNAL] SBS gas distribution rack moved to EEL/125; help setting up?</font>
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Jack is correct, these flow meters have limited accuracy only within the advertised range of the flow meter. The mass flow transducers are more accurate and should be used to determine actual flow rates.<br>
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Dwyer RMA 12 ssv - 50sccm-500sccm<br>
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Dwyer RMA 13 ssv - 100sccm-1000sccm<br>
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<div>-- <br>
George Jacobs<br>
<span style="font-family:"Times New Roman",Times,serif">Jefferson Lab (TJNAF)</span><br>
<span style="font-family:"Times New Roman",Times,serif">STE 12</span><br>
<span style="font-family:"Times New Roman",Times,serif">12000 Jefferson Ave.</span><br>
<span style="font-family:"Times New Roman",Times,serif">Newport News, VA 23606</span><br>
<span style="font-family:"Times New Roman",Times,serif">(office) 757-269-7021</span><br>
<span style="font-family:"Times New Roman",Times,serif">(email) jacobsg@jlab.org</span></div>
<div><span style="font-family:"Times New Roman",Times,serif">(url) https://userweb.jlab.org/~jacobsg<br>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Dsg-halla_gem <dsg-halla_gem-bounces@jlab.org> on behalf of Jack Segal <segal@jlab.org><br>
<b>Sent:</b> Tuesday, September 28, 2021 1:22 PM<br>
<b>To:</b> jboyd@jlab.org <jboyd@jlab.org><br>
<b>Cc:</b> dsg-halla_gem@jlab.org <dsg-halla_gem@jlab.org><br>
<b>Subject:</b> Re: [Dsg-halla_gem] [EXTERNAL] SBS gas distribution rack moved to EEL/125; help setting up?</font>
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<div class="x_PlainText"> I turned off all the flow meters. Turned them on a section at a time. I think you<br>
are just using a lot of gas. I'm not sure how accurate those visual meters are at<br>
low flow. Also, they are calibrated for air. You are using Ar/CO2.<br>
What is the make and model of the visual flow meters?<br>
<br>
On 9/28/2021 12:46 PM, Jack Segal wrote:<br>
> Isolate the GEMs and restart flow one at a time.<br>
> <br>
> Sent from my iPhone<br>
> <br>
>> On Sep 28, 2021, at 11:39 AM, jboyd@jlab.org wrote:<br>
>><br>
>> To all,<br>
>><br>
>> Anu and I set up the gas distribution from the gas cylinders, to through<br>
>> the gas rack, and onto the GEM layers. We have been flushing and flowing<br>
>> gas. It seems that the gas loss rate is a bit more than what we would<br>
>> expect given the flow rates that we have set. We are losing about a bottle<br>
>> a day for our 8 layers of GEMs. We expect that 1 bottle should be about 3+<br>
>> days.<br>
>><br>
>> Therefore, we are suspecting a leak somewhere, perhaps on the gas<br>
>> distribution rack. I checked around the gas cylinders and the connection<br>
>> manifold and couldn't find any leaks (I did find one but I was able to<br>
>> fix/seal it).<br>
>><br>
>> What should we do about getting the setup of the gas rack and possibly the<br>
>> cylinder/manifold setup leak tested and checked?<br>
>><br>
>> Thank you for the help.<br>
>><br>
>> Best,<br>
>><br>
>> John<br>
>><br>
>>> Hi Brad,<br>
>>><br>
>>> We discussed the SBS gas distribution in our meeting today. I will<br>
>>> schedule a time to come over and install a Raspberry Pi in area for<br>
>>> monitoring.<br>
>>><br>
>>> It looks like the rack accessory box has been relocated from the Hall to<br>
>>> EEL 125, George is scheduling to connect the gas flow sensor chassis<br>
>>> channels to the appropriate flow meters.<br>
>>><br>
>>> After these steps are completed, I'll send an email so Kondo's group can<br>
>>> connect their detector gas lines to the output side of the gas flow sensor<br>
>>> chassis and hook up the premix bottle to the regulator input.<br>
>>><br>
>>><br>
>>><br>
>>> Regards,<br>
>>> Marc McMullen<br>
>>> Sr. Instrumentation Designer<br>
>>> Detector Support Group<br>
>>> (757) 269-7738<br>
>>><br>
>>> From: Brad Sawatzky<<a href="mailto:brads@jlab.org">mailto:brads@jlab.org</a>><br>
>>> Sent: Tuesday, September 21, 2021 10:51 PM<br>
>>> To: Kondo Gnanvo<<a href="mailto:kagnanvo@jlab.org">mailto:kagnanvo@jlab.org</a>>; John<br>
>>> Boyd<<a href="mailto:jboyd@jlab.org">mailto:jboyd@jlab.org</a>>; Rathnayake, Anuruddha<br>
>>> (adr4zs)<mailto:adr4zs@virginia.edu>; Marc<br>
>>> Mcmullen<<a href="mailto:mcmullen@jlab.org">mailto:mcmullen@jlab.org</a>><br>
>>> Cc: dsg-halla_gem@jlab.org<mailto:dsg-halla_gem@jlab.org>; Jack<br>
>>> Segal<<a href="mailto:segal@jlab.org">mailto:segal@jlab.org</a>><br>
>>> Subject: [EXTERNAL] SBS gas distribution rack moved to EEL/125; help<br>
>>> setting up?<br>
>>><br>
>>> Hi Marc, et al,<br>
>>><br>
>>> The SBS GEM gas distribution rack was recently moved to EEL/125.<br>
>>> That is where the SBS GEM layers are being stored and worked on.<br>
>>><br>
>>> Marc, can your group support the GEM group in completing the setup<br>
>>> of that gas system so they can start flowing gas to the layers in<br>
>>> EEL/125? It will need to be reconnected to the network, some gas line<br>
>>> 'jumpers' need to be run between the two sides of the rack, and lines<br>
>>> need to be run from the rack to the GEM modules themselves. (I believe<br>
>>> Jack fixed the issue with i2c multiplexing in that rack.)<br>
>>><br>
>>> I also moved a large spool of 1/4" poly into EEL/125 so fresh gas lines<br>
>>> can be run. General consensus is to position the rack in the most<br>
>>> convenient location in EEL/125 and run (relatively short) gas lines of<br>
>>> the needed length to the individual GEM modules. We will cut a set of<br>
>>> new (longer) gas lines for the final setup in the Hall in a couple<br>
>>> months.<br>
>>><br>
>>> I'll be out of town for about a week, but I've discussed this with John<br>
>>> Boyd and Anuruddha, and they are generally in either EEL/125 or /126.<br>
>>><br>
>>> -- Brad<br>
>>><br>
>>> --<br>
>>> Brad Sawatzky (he/him), PhD <brads@jlab.org> -<>- Jefferson Lab/ Hall<br>
>>> C/C111<br>
>>> Ph: 757-269-5947 -<>- Fax: 757-269-5235 -<>- Pager: brads-page@jlab.org<br>
>>> The most exciting phrase to hear in science, the one that heralds new<br>
>>> discoveries, is not "Eureka!" but "That's funny..." -- Isaac Asimov<br>
>>><br>
>>><br>
>><br>
>><br>
<br>
-- <br>
John(Jack) Segal<br>
Halls A and C Spectrometer Support Manager<br>
Thomas Jefferson National Accelerator Facility<br>
12000 Jefferson Avenue<br>
Suite 12<br>
Newport News, VA 23606-4486<br>
Phone: (757) 269-7242<br>
Cell: (757) 320-9977<br>
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