[Dsg-mvt] Request new manometer for Eel premix gas system + interlock

[DEFURNE Maxime]

Now that we have the new gauge, we will monitor it regularly with the two next bottles in order to determine a "critical' level (for example when we know there is only half a day left in the bottle). Consequently we will then know we have to watch the gas flow during this half-day until it starts decreasing slowly to 0.  It takes about one hour to go from nominal flow to 0 when it gets empty. We then plan to change the bottle during this decreasing hour during working hours. 

If we know it will happen during night, we will then turn off the HV and DAQ until the next morning we change the bottle.

Thanks again for everything.


________________________________________
De : Brian Eng [beng at jlab.org]
Envoyé : vendredi 16 juin 2017 17:22
À : Amrit Yegneswaran
Cc : Franck Sabatie; CHRISTIAENS Guillaume; Patrizia Rossi; DEFURNE Maxime; Burkert Volker; dsg-mvt at jlab.org; Matthew Marchlik; Bob Miller
Objet : Re: [Dsg-mvt] Request new manometer for Eel premix gas system + interlock

Since there is no way to guarantee no interruptions in flow (since there is only the single regulator & bottle) and the limited quantity of gas on hand I'd assume they would wait until the bottle was completely empty, i.e. both gauges read zero.

However, that decision comes from the MVT group (their detector) and Hall B (they're paying for the gas).


Basically we're changing the bottles during the day when requested until the MVT staff on-site can do it themselves.

> On Jun 16, 2017, at 10:41 AM, Amrit Yegneswaran <yeg at jlab.org> wrote:
>
> good job brian.
> at what pressure should the cylinder be changed?