[Dsg-htcc] HTCC Nitrogen Supply (No gas flow)

[Brian Eng]

Will and I just got back from the Hall, he found that the regulator supplying the HTCC was at 0 psi and that there are 2 valves closed upstream of the line that supplies that regulator.

Since we didn't close them or know why they were closed we left them alone.

Should be fairly trivial to get the gas flowing again once we figure out why they were closed.

> On Apr 7, 2017, at 5:44 PM, Brian Eng <beng at jlab.org> wrote:
> 
> I just double checked and the cRIO (HTCC still has it's own dedicated one) is on and responsive and the MFC isn't reporting any errors (like it would if it lost network or power) while the cRIO was still on.
> 
> It looks like it lost flow quite suddenly at ~3PM today.
> 
> <Screen Shot 2017-04-07 at 5.29.39 PM.png>
> 
> Will,
> 
> You can try stopping/starting the VI on the cRIO (which will re-initiate the connection to the MFC) or rebooting the cRIO, but I'm not very hopeful that will recover the flow. Plus you might want to wait to get verification that there is actually gas being supplied to the MFC to see if that resolves the issue before restarting stuff, if that is indeed the problem the MFC will start flowing as soon as it has gas.
> 
> Unfortunately with your dedicated setup I can't connect directly to the MFC (it can only talk to the cRIO), but I don't have any reason to believe that would result in any different information.
> 
>> On Apr 7, 2017, at 5:25 PM, Will Phelps <wphelps at jlab.org> wrote:
>> 
>> Hello All,
>> It looks like the nitrogen line to the HTCC is not under pressure. Youri and I have contacted the DSG group, specifically Brian Eng about this. He says that it does not look like it’s the cRIO controller or MFC. Youri went to the hall and there were no changes in hardware or input on our side. So we would like someone to check on the availability of nitrogen in the gas supply line to the HTCC.
>> Thanks,
>> -Will
>> 
>> 
>> 
>> 
>> <Screen Shot 2017-04-07 at 5.18.10 PM.png>
>