[Dsg-rtpc] DMS to RTPC pressure specification

[Sebastian Kuhn]

Dear Marc,

I don’t think that we HAVE to replace that transducer - I think that its accuracy (which I translate to be around 0.0014 atm or 1.4 mbar) should be (barely) sufficient. Our goal is to establish whether there is any SIGNIFICANT (0.01 atm) pressure drop between the DMS and the RTPC, and whether the pressure drop is roughly constant over time. The absolute pressure in the DMS is less important. Of course, a transducer with a full range of +/- 50 Torr and 4-5 times higher precision would be preferable, but not mandatory.

- Sebastian

On Jun 4, 2019, at 2:06 PM, Marc Mcmullen <mcmullen at jlab.org<mailto:mcmullen at jlab.org>> wrote:

Hi Sebastian,

DSG has completed connections to the valve panel as specified by the drawings George has provided. We have been running some functionality tests to ensure the controls software is reading and controlling the instrumentation properly.

The BONuS 6 detector is not connected to the system.

During testing we have discovered an issue with the current differential pressure transducer, as it does not have the proper ranger for the set up.


The full scale range of this transducer (MKS 226a) is ± 200 Torr (± ~107.048 iwc).

The EEL RTPC bubbler is set to ~0.1 (iwc).

The accuracy of this 226a is ± 0.53524 (iwc).

Currently, any measurement we read is within the bounds of the accuracy. Could you please provide a pressure differential specification between the DMS and RTPC (what is expected and what would be extreme). We can then source a suitable component.

 You may also wish to consider adding another absolute pressure transducer to provide the actual DMS pressure.

Thanks,
Marc


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