[labnetwork] regulator question

[Fouad Karouta]

Hi Rick,


I agree with Tom that you don't need any heating jacket of the cylinder. But be aware the C4F8 is a liquid in the cylinder and we had a similar issue here at ANU with a C4F8 cylinder hooked directly to SS tubing without regulator with the argument that the vapour pressure is 2.3 bars at RT. However in this situation heating the line to 30 deg C didn't help stabilising the flow and only when we retrofitted a pressure regulator with only a secondary gauge and the heating line we did get a stale flow. I believe the regulator is maintaining the vapour pressure of C4F8 in the cylinder that works as a buffer for a constant gas delivery.


Hope this helps,

Fouad

________________________________
From: labnetwork-bounces at mtl.mit.edu <labnetwork-bounces at mtl.mit.edu> on behalf of Morrison, Richard H., Jr. <rmorrison at draper.com>
Sent: 17 July 2014 22:42
To: labnetwork at mtl.mit.edu
Subject: [labnetwork] regulator question

Hi,

My gas room has no temperature control and I am having delivery problems with C4F8 tank. I have a Tescom-100 regulator on the bottle (part of a gas panel 6+ years old).  My question is should I wrap the tank with a blanket to keep it constant temperature?  I have this issue when there are large temperature swings outside my gas room is 70F +-8F

Is the regulator I am using the proper one? Any suggestions are welcome.

Rick


Draper Laboratory
Principal  Member of the Technical Staff
Group Leader Microfabrication Operations
555 Technology Square
Cambridge Ma, 02139-3563

www.draper.com
rmorrison at draper.com
W 617-258-3420
C 508-930-3461

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