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Would a precision 2 wire thermistor sensor from Omega work?
<a class="moz-txt-link-freetext" href="https://www.omega.com/pptst/ON-401_ON-402.html">https://www.omega.com/pptst/ON-401_ON-402.html</a><br>
<br>
Cheers,<br>
George<br>
<br>
<div class="moz-cite-prefix">On 3/23/2018 1:16 PM, George Jacobs
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:ee7ae516-0c78-d64a-2289-5a382ddfb3a9@jlab.org">Hi
Sebastian,
<br>
<br>
Does the temp sensor need to be in the gas volume, or can it just
be in contact with the RTPC externally?
<br>
<br>
Thanks,
<br>
<br>
George
<br>
<br>
<br>
On 03/23/2018 11:29 AM, kuhn wrote:
<br>
<blockquote type="cite">O.k., so I assume that the pressure sensor
are (or will be) taken care of by you guys (with W&M and
Narbe).
<br>
About the temperature sensors: Again, it doesn’t have to be
super-precise (up to 5 degrees F relative), and it doesn’t have
to cover a huge range (50 - 100 F), but it MUST be compact and
ideally need only 2 (or 3) leads to be brought out of the RTPC.
I agree that it most likely will just measure ambient
temperature, but it should be the temperature of the RTPC
itself, not somewhere “roughly in the vicinity”. I could start
digging for a sensor like that, but frankly I was hoping that
the gas system experts in the BONuS collaboration can do the
sleuthing.
<br>
<br>
- Sebastian
<br>
<br>
<blockquote type="cite">On Mar 21, 2018, at 9:47 AM, George
Jacobs <a class="moz-txt-link-rfc2396E" href="mailto:jacobsg@jlab.org"><jacobsg@jlab.org></a> wrote:
<br>
<br>
Hi Sebastian,
<br>
<br>
- The pressure sensors, 1 each of an absolute pressure
transducer and 1 each of a differential pressure transducer.
These sensors connect to the gas volume via tubing and
therefore do not take up space inside the detector volume. The
tubing connection locations must be determined along with the
method of the connection. The sensors themselves, should be
located outside the magnetic field. These transducers are
shown in the P&I diagram, PT1 and PT2. These are connected
via the blue lines, tubing, to the RTPC and DMS.
<br>
<br>
- The temperature sensor, first we need to define what
temperature to monitor. If it is the temperature of the gas,
then we must define the location where the sensor measures the
gas temp. With the flow rates intended, <100sccm, this will
most likely be a measurement of ambient temperature. We must
also determine the type of sensor to use, since the standard
ones are too large, along with the location of the sensor and
it's connection to the readout.
<br>
<br>
Cheers,
<br>
George
<br>
<br>
On 3/20/2018 4:55 PM, kuhn wrote:
<br>
<blockquote type="cite">My only concern is about the sensors -
everything else seems to be in good hands. To reiterate,
here is the dream wish list:
<br>
<br>
1 combination sensor (or small separate sensors) for
ABSOLUTE PRESSURE and for Temperature. The required range
for both is very small (50 - 100 F and 0.9 to 1.1 atm) but
they have to be tiny to fit inside the RTPC. (We need two of
each so we can also monitor the DMS, although there space is
not quite as much at a premium. We MIGHT get around the
pressure sensor for the RTPC if instead we have an extra
(tight) gas line that attaches to one end of a differential
pressure meter, with the other end attached to the DMS. We
must know the absolute pressure in both to within 0.01 (0.14
psi) if at all possible, while the temperature is less
sensitive (3 degrees Celsius or 5 F). We can accomplish this
either by having an absolute pressure meter at at least one
of these two places, or relative pressure sensors combined
with a Hall barometer, or some combination thereof with a
differential pressure sensor (probably most sensitive).
<br>
I hope the gas group can look into possible sensors for this
that are available on the market. The ones suggested by
George look way too big, at least for the RTPC. (I think for
the temperature sensor, a simple T-dependent resistor or
diode should be good enough!)
<br>
<br>
Thanks - Sebastian
<br>
<br>
<br>
<blockquote type="cite">On Mar 20, 2018, at 4:47 PM, George
Jacobs <a class="moz-txt-link-rfc2396E" href="mailto:jacobsg@jlab.org"><jacobsg@jlab.org></a>
<br>
wrote:
<br>
<br>
Hi Carlos,
<br>
<br>
The misc swagelock hardware includes valves, fittings,
adapters, ferrules, etc.
<br>
<br>
The mass flow controllers have the longest lead times and
should be ordered ASAP. A minimum of 2 mass flow
controllers should be ordered in order to keep our options
between series and parallel DMS setup.
<br>
<br>
As far as the temp sensor, would one of the following
work?
<br>
<br>
<a class="moz-txt-link-freetext" href="https://www.mcmaster.com/#6467t24/=1c2110g">https://www.mcmaster.com/#6467t24/=1c2110g</a>
<br>
<br>
or
<br>
<br>
<a class="moz-txt-link-freetext" href="https://www.mcmaster.com/#3866k43/=1c211mt">https://www.mcmaster.com/#3866k43/=1c211mt</a>
<br>
<br>
<br>
Cheers,
<br>
George
<br>
<br>
On 3/20/2018 3:05 PM, Carlos Ayerbe wrote:
<br>
<br>
<blockquote type="cite">Hi George, Marc and Brian and all,
<br>
<br>
I got noticed from Keith, that we can spend some money
on the acquisition of several components for the gas
system.
<br>
<br>
I was checking and these attachments correspond to the
latest configuration. I noticed that the excel file is
not updated according to the scheme (just some
discrepancy numbers, like how many MFC items are
counted).
<br>
<br>
There are a few items I would like to understand:
<br>
- the temperature probe is under interrogation mark, do
we have any reference about it? In other words, do we
know what do we want?
<br>
- the item 'misc Swagelock hardware' is $2,500 but I
don't know what are w talking about, valves, hoses,
regulators, gauges?
<br>
<br>
I would like to confirm with Sebastian (and the others)
that the scheme is more or less the starting point to
begin building the system, so we can discuss the exact
number of components to buy as soon as possible. So, in
accordance, update the excel file.
<br>
<br>
Thank you
<br>
<br>
Cheers,
<br>
<br>
-Carlos
<br>
<br>
<br>
----- Original Message -----
<br>
From: "George Jacobs"
<br>
<br>
<a class="moz-txt-link-rfc2396E" href="mailto:jacobsg@jlab.org"><jacobsg@jlab.org></a>
<br>
<br>
<br>
To:
<br>
<br>
<a class="moz-txt-link-abbreviated" href="mailto:dsg-rtpc@jlab.org">dsg-rtpc@jlab.org</a>, "kuhn" <a class="moz-txt-link-rfc2396E" href="mailto:kuhn@jlab.org"><kuhn@jlab.org></a>
<br>
<br>
<br>
Sent: Monday, February 12, 2018 9:25:58 AM
<br>
Subject: Re: [Dsg-rtpc] RTPC gas system
<br>
<br>
Hi Sebastian,
<br>
<br>
Please find attached P&I diagram along with the
components list for Series configuration. The list is
also valid for the Parallel configuration, so there are
options if needed.
<br>
<br>
According to the markings on the deck, the magnetic
field extends out slightly beyond the cart. Not sure if
any part of it is free of the magnetic field. Maybe the
field is low enough all the way outboard at floor level?
This may require longer and larger ID gas lines.
<br>
<br>
Cheers,
<br>
George
<br>
<br>
<br>
<br>
<br>
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<br>
</blockquote>
-- <br>
George Jacobs
<br>
Jefferson Lab (TJNAF)
<br>
STE 12
<br>
12000 Jefferson Ave.
<br>
Newport News, VA 23606
<br>
<br>
(office) 757-269-7115
<br>
<br>
(cell) 757-876-0480
<br>
<br>
(email)
<br>
<br>
<a class="moz-txt-link-abbreviated" href="mailto:jacobsg@jlab.org">jacobsg@jlab.org</a>
<br>
<br>
<br>
<br>
(website)
<br>
<br>
<a class="moz-txt-link-freetext" href="https://userweb.jlab.org/~jacobsg">https://userweb.jlab.org/~jacobsg</a>
<br>
<br>
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</blockquote>
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<br>
</blockquote>
-- <br>
George Jacobs
<br>
Jefferson Lab (TJNAF)
<br>
STE 12
<br>
12000 Jefferson Ave.
<br>
Newport News, VA 23606
<br>
<br>
(office) 757-269-7115
<br>
<br>
(cell) 757-876-0480
<br>
<br>
(email)
<br>
<a class="moz-txt-link-abbreviated" href="mailto:jacobsg@jlab.org">jacobsg@jlab.org</a>
<br>
<br>
<br>
(website)
<br>
<a class="moz-txt-link-freetext" href="https://userweb.jlab.org/~jacobsg">https://userweb.jlab.org/~jacobsg</a>
<br>
</blockquote>
</blockquote>
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<br>
<pre class="moz-signature" cols="72">--
George Jacobs
Jefferson Lab (TJNAF)
STE 12
12000 Jefferson Ave.
Newport News, VA 23606
(office) 757-269-7115
(cell) 757-876-0480
(email) <a class="moz-txt-link-abbreviated" href="mailto:jacobsg@jlab.org">jacobsg@jlab.org</a>
(website) <a class="moz-txt-link-freetext" href="https://userweb.jlab.org/~jacobsg">https://userweb.jlab.org/~jacobsg</a></pre>
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