[Dsg-ltcc] MFC ?

[Brian Eng]

It depends on what is actually wrong with it. Could be a fuse, could be a bad network cable, etc. We do have a spare available to swap in if need be.

Also since the solenoid logic is still running and the sectors go into a common manifold they'll still be able to lower the pressure into the manifold/tube and eventually each other.

See the recent pressure drops despite the exhaust manifold MFC being offline. Also we're assuming that what the MFC manual says is true and that when the last network connection is closed the MFC valve will close. I suppose it's possible that it's actually set to the last flow value (or stuck open) in which case all that we'll lose is the ability to see and keep track of the amount flown through it but everything else will work as expected.

The rate the pressure went down sort of leads me to believe that the MFC isn't actually closed, but we'll know more if we have more events where the return solenoids are trying to open up.

[cid:FC98A67B-A26A-4793-8F5F-C3C00CA8E444 at jlab.org]

On Apr 9, 2019, at 1:35 PM, Maurizio Ungaro <ungaro at jlab.org<mailto:ungaro at jlab.org>> wrote:

Hi,

Is the MFC going to be replaced?

Re: https://logbooks.jlab.org/entry/3677252

Thanks,
Mauri
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