[Dsg-rtpc] [EXTERNAL] Gas fittings for the BONuS12 DMS

[Brian Eng]

Hi Sebastian,

Regarding this point, The Hall B Gas System already has a sensor/PV that is reading the absolute pressure in the Hall itself (i.e. ambient). This can be used to convert any absolute pressure to a relative one.

So we already have enough sensors that we could calculate this value (DP between RTPC & He Buffer), but I don't know what kind of accuracy/speed you require.

If you require something with higher accuracy we would need to know what pressure range you expected to see if there is any sensors available in-hand that would work. The lead-time on these is long enough that we wouldn't get it in time for the experiment.

> On Jan 3, 2020, at 11:58 AM, Sebastian Kuhn <kuhn at jlab.org> wrote:
> 
> 2) Is there a possibility to add one more item to the gas panel? (rather belated, I know - my apologies) I realized that we really would like to be able to measure the differential pressure between the 4He gas buffer volume  (orange in the gas  panel design drawings) and the RTPC (green). This would
> a) close the loop so we have both absolute and relative pressure for all relevant parts of the system
> b) allow us to monitor (and alarm on) any pressure differential between the RTPC and the buffer volume that exceeds the (rather limited) safety margin for the thin ground foil between the two.