[Dsg-htcc] [Dsg-mvt] MVT Mix 1

Marc McMullen mcmullen at jlab.org
Wed Oct 3 09:12:19 EDT 2018

Hi Maxime,

I have verified that the FMT WANTGAS signal is set to false. The MFCs 
will not try to flow gas to Mix 1 buffer tank.

Hi Denny and Bob,

The Mix 1 circuit is no longer in use. Please provide DSG with advanced 
notice when the MFCs are scheduled for removal. This should be 
coordinated with the SVT, MVT, FT, and HTCC detector managers because 
the software will need to be stopped briefly when it is updated. This 
should be done during day shift when no beam is needed, due to the fact 
that HTCC may need to switch to the manual rotameter for a brief period 
(< 1hr) and then back to the MFC.



On 10/3/2018 10:32 AM, mdefurne wrote:
> Hi Marc, Hi Brian,
> It should be off now. Can you check it? If Mix1 is still asked to 
> provide gas, let me know.
> Kind regards,
> Maxime
> On 02/10/2018 19:53, Marc McMullen wrote:
>> Hi Maxime,
>> Hall B Engineering has informed DSG that the Mix 1 circuit is not 
>> currently needed for MVT/FT operations, and there are no current 
>> plans to connect a detector to Mix 1. If this is the case, please 
>> change the gas request Boolean, (B_DET_FMT_GAS_WANTGAS) which is 
>> being sent from the Saclay Gas Controls system so that it is not 
>> requesting gas.
>> Once this signal status has been changed, the mass flow controllers 
>> will no longer supply gas to fill that tank. It can then be pressure 
>> relieved, manually.
>> If the MVT Mix 1 MFCs are no longer needed, they should be 
>> uninstalled from the gas panel and returned to the DSG to prevent any 
>> unnecessary exposure to the weather.
>> *Please contact the DSG **_(prior to disconnecting the MFCs)_**if and 
>> when it is decided to uninstall the MFCs, so that we can make the 
>> necessary adjustments to the code. *
>> *It is very important to contact the DSG _before_ disconnecting power 
>> or network from any MFCs. **This may cause an interruption of gas 
>> service to other systems**.*
>> Regards,
>> -- 
>> Marc McMullen
>> Detector Support Group
>> 757-269-7738
>> _______________________________________________
>> Dsg-mvt mailing list
>> Dsg-mvt at jlab.org
>> https://mailman.jlab.org/mailman/listinfo/dsg-mvt

Marc McMullen
Detector Support Group

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