[Dsg-ft] [Dsg-mvt] MVT gas mixing electronics/network equipment

[Marc McMullen]

Hi Matt

Relocation of the MVT mixing system controls to accommodate the 
installation of the MVT mixing system on the Hydrogen Target gas pad.

*MFC Power:*

The mass flow controllers will be located outside. To ensure power 
during outages we will need to locate the controls interface chassis in 
Hall B on SFL3. Five MFC power cables should be run from the SFL3_south 
through the penetration to the gas pad.

*MFC Communication:*

Per our conversation with Brent Morris, Hall B will need to run network 
cable from an available UPS backed up network switch on the appropriate 
subnet to the gas pad through the penetration.

*Signals:*

Pressure: The MVT has two pressure transducers which will be located on 
the HT gas pad. Power and signal cable should follow the same route as 
the MFC power to SFL3_south.

Since the MFCs are temperature sensitive we should add redundant 
Temperature monitoring to the new MFC housing. These signals can be 
monitored by the Hall B Gas Controls software and provide that data to 
EPICS.

Type

	

# of cables

	

Start Location

	

Comment

MFC Power

	

5

	

SFL3_S

	

Expected (I) 0.167A. Shielded 2cond. 22 awg.

MFC Communication

	

5

	

Hall B

	

Cat. 5

Pressure Transducers

	

2

	

SFL3_S

	

Expected (I) 0.140A. shielded 3cond. 22 awg.

MFC Temp monitor

	

2

	

SFL3_S

	

TBD

Hall B should provide the cable length for these runs so that DSG can 
procure the necessary cable. The previous length expectation was much 
shorter.

Regards,

Marc


On 9/14/2017 3:59 PM, Marc McMullen wrote:
> Hi Matt,
>
> I'm scheduled to meet with DSG management in the morning to discuss a 
> strategy for the relocation of the controls equipment. We need to make 
> sure we cover all bases with power, network, UPS, and temperature 
> monitoring of the MFCs. We will get back to you tomorrow on the matter.
>
> Regards,
>
> Marc
>
>
>
> On 9/14/2017 11:34 AM, Matthew Marchlik wrote:
>> Hi Marc,
>>
>> I met with Walt Akers, Tim Minga and Paul Powers this morning to 
>> discuss installation of the system into 96B. The consensus is that 
>> there is not way to modify the shed for flammable gas service without 
>> spending significant time and money. Installing into 96C, hall C's 
>> gas shed, was also discussed but would not work out.
>>
>> So, the mixing system and gas supply bottles will be installed on the 
>> gas pad. Could you please reply to this email and list the 
>> items/steps necessary for installation from DSG's standpoint we 
>> discussed yesterday?
>>
>> Hall B will create a small insulated foam box to house the MFCs with 
>> a segment of directly controlled heat tape within to keep the 
>> temperature above 50F. It will have holes for the cables. Is there 
>> any need to regularly access the MFCs after commissioning?
>>
>> The C4H10 line from the bottle to the MFCs will need to be wrapped 
>> with insulation and heat tape set to 90F, same as the bottle blanket. 
>> (George, can this be powered/controlled in series with the heater 
>> blanket?)
>>
>> Hall B and I will update all of the PS documentation, drawings, 
>> models and P&IDs.
>>
>> Thanks,
>> Matt
>>
>>
>> ----- Original Message -----
>> From: "Marc McMullen" <mcmullen at jlab.org>
>> To: "Matthew Marchlik" <marchlik at jlab.org>, "Bob Miller" 
>> <rmiller at jlab.org>, dsg-mvt at jlab.org
>> Sent: Wednesday, September 6, 2017 3:53:29 PM
>> Subject: MVT gas mixing electronics/network equipment
>>
>> Hi Matt and Bob,
>>
>> Is there a firm plan on the location of the MVT mixing instrumentation,
>> electronics, and network equipment. If the equipment cannot be located
>> in the Hall, I understand that the gas pad may be the next logical
>> choice. The instrumentation which will have to be at the gas panel are
>> the MFCs, which are temperature sensitive. The MFCs communicate via the
>> network, so under normal circumstances we would like to have a switch at
>> the location. We would also like to put the power for the MFCs (a
>> chassis containing a power supply) in that location if possible. To
>> house all of these components, may require large enclosure, or rack
>> which can be enclosed and climate controlled to keep all components
>> running and in good shape for the long run. At any rate, please let us
>> (DSG) know as soon as a decision is made, so that we can plan 
>> accordingly.
>>
>>
>> Thanks,
>>
>

-- 
Marc McMullen
Detector Support Group
757-269-7738

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