[Dsg-mvt] Fwd: RE: Re: GE50A
Marc McMullen
mcmullen at jlab.org
Mon Jan 8 10:40:10 EST 2018
Below is the response from MKS concerning MFC compatibility C4H10 and
CF4. George is researching suitable replacements for the C4H10 units.
George and I met with the MVT detector owners this morning. He has
recommended that the isobutane line is vented to eliminate any possible
condensation, and that the cylinder pressure regulator is adjusted to
20psi. The temperature of the MFC enclosure is currently bouncing
between 69F and 75F. Maxime will work with Hall B to vent the line,
adjust the pressure and temperature (just enough to ensure the low end
is above 70F). He will then purge all MFCs and lines with Argon. We can
then test the Mix 1 mfc to find it's current leak rate.
-Marc
-------- Forwarded Message --------
Subject: RE: Re: GE50A
Date: Wed, 3 Jan 2018 21:45:44 +0000
From: Rockwood, Steve <Steve_Rockwood at mksinst.com>
To: Marc McMullen <mcmullen at jlab.org>
CC: Brian Eng <beng at jlab.org>
Marc, Brian,
Material Compatibility
GE50A013103SBV020 C4H10 Isobutane
compatibility: The Viton elastomer seals are variously rated as
Satisfactory, or insufficient data. Another reference cites Kalrez as
preferred.
GE50A013502SBV020 CF4 Carbon TetraFluoride, Halocarbon 14, Freon
14, Tetrafluoromethane
compatibility: The Viton elastomer
seals are variously rated as Satisfactory, or insufficient data.
Another reference cites Viton or Buna-N as preferred.
The GE50A has a Normal Operating Temperature range of 10C to 50C (50F
to 122F).
The Leak Integrity of the GE50A through the closed valve is 0.1% of the
N2 fullscale range with 40 PSID (ie 40 PSIG to Atm).
A range of 1000 SCCM N2 would be allowed 1 SCCM under the above conditions.
A range of 500 SCCM N2 would be allowed 0.5 SCCM under the above conditions.
Material compatibility is likely not a factor.
Condensation of process materials in the MFC to a liquid state may
disrupt stable flow.
The boiling point of isobutane is about -12C (11F) - so conditions would
have to have been very cold.
Flowing an inert gas (Argon) will help clear this up.
Leakage:
To verify amount of leakage, set MFC to N2 gas.
Once zeroed, apply gas to the MFC. If leaking, there will be a flow
seen - this is real flow and should not be zeroed out.
-Steve
---------------------------------------------------------------------------------------------------------
*Steven W. Rockwood*
*Senior Technical Support Engineer *
*Global Service - Flow Solutions*
*MKS Instruments, Inc.*
90 Industrial Way
Wilmington, MA 01887 USA
Direct: 978.284.4545
Main: 978.284.4000
steve_rockwood at mksinst.com
www.mksinst.com
---------------------------------------------------------------------------------------------------------
*From:*Marc McMullen [mailto:mcmullen at jlab.org]
*Sent:* Tuesday, January 02, 2018 11:51 AM
*To:* Rockwood, Steve <Steve_Rockwood at mksinst.com>
*Cc:* Brian Eng <beng at jlab.org>
*Subject:* Fwd: Re: GE50A
Steve,
Attached is the P&I for the system. In addition to evaluating the C4H10
(GE50A013103SBV020), please check the CF4 (GE50A013502SBV020) as well. I
will run the leak test on the bad MFC to give you the leakage flow,
before the holidays it was 35 - 50 sccm.
Thanks,
Marc
-------- Forwarded Message --------
*Subject: *
Re: GE50A
*Date: *
Thu, 21 Dec 2017 07:19:26 -0500 (EST)
*From: *
Marc McMullen <mcmullen at jlab.org> <mailto:mcmullen at jlab.org>
*To: *
Steve Rockwood <Steve_Rockwood at mksinst.com>
<mailto:Steve_Rockwood at mksinst.com>
Hi Steve,
I have attached our system p&i. Essentially, I need to know if the G50a
series is ok for use outside with C4H10. We are trying to keep the
system at an appropriate temperature using an insulated enclosure and
heat tape, with insulation and heat tape on the gas lines. The gas
bottle has a heated blanket as well.
On the initial startup of using C4H10 the outside temperature was near
and freezing. And the flow through those mfcs is very low (~10ccs), we
have them set for the lowest full scale for C4H10 (130sccm I think).
At first everything was ok, but the mfcs started fluctuating. Eventually
we disconnected mix 2 from the tank and we actually saw a small amount
of liquid drain and evaporate. We believe the gas condensed inside the
mfc. I've taken it to a lab and tested it at room temperature with argon
and it shows flow when the internal valve is closed when gas is at the
supply fitting. It will run and control, but not below 50ccs. At that
point the internal valve % is 7.7(closed) and we still see flow. When
the source is closed the flow bleeds off slowly. And when it is
de-energized and capped on both ends the flow reads zeroish. At that
point it can be zeroed by the procedure in the manual. But, as soon as
there is pressure, even with the valve set to "close" we read flow (30 -
50 ccs)
I'll try to call you this morning. Essentially, this one will need
repair, so if you can arrange an RMA today I can ship it. But more
importantly, we need to know weather this set up will work or not.
Marc McMullen
Physics Division
Detector Support Group
7738
------------------------------------------------------------------------
*From: *"Steve Rockwood" <Steve_Rockwood at mksinst.com>
<mailto:Steve_Rockwood at mksinst.com>
*To: *"Marc McMullen" <mcmullen at jlab.org> <mailto:mcmullen at jlab.org>
*Sent: *Wednesday, December 20, 2017 2:21:37 PM
*Subject: *GE50A
Hello Mark,
Please give me a call about GE50A.
-Steve
---------------------------------------------------------------------------------------------------------
*Steven W. Rockwood*
*Senior Technical Support Engineer *
*Global Service - Flow Solutions*
*MKS Instruments, Inc.*
90 Industrial Way
Wilmington, MA 01887 USA
Direct: 978.284.4545
Main: 978.284.4000
steve_rockwood at mksinst.com <mailto:steve_rockwood at mksinst.com>
www.mksinst.com
<https://urldefense.proofpoint.com/v2/url?u=http-3A__www.mksinst.com&d=DwMFAg&c=lz9TcOasaINaaC3U7FbMev2lsutwpI4--09aP8Lu18s&r=QXCvu8QK6ikaH4obIVOnE99umgkKvVo3REsRfybrlqs&m=M3v6fwYuNaiNSo_y15d4UetGyMDYDcpNceiJgdQrHpU&s=KBV8JWO-eihN5U7ntylxvrS7LuJteQl0al4sa6ESW50&e=>
---------------------------------------------------------------------------------------------------------
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