[Dsg-mvt] Status about MFC for isobutane

[Marc McMullen]

Hi Maxime,

I should have the spare tested with N2 (room temperature) by some time 
tomorrow. I will ask Todd to install it at the valve panel at that 
point. I will ask the system owner if there is a possibility to make 
some changes to the valve panel to make testing and future maintenance 
of the mfcs much easier. But not sure when that would happen. After we 
swap out the mfc, I'll try the same tests with Argon and lastly C4H10.

One thing I thought may be a possible issue was the temperature. The low 
range operating range of the MFC is 50 deg. F. I'm not sure where it was 
being measured from previously, but I moved the RTD sensor for the gas 
pad (B_SYS_WEATHER_GP_Temp) inside the enclosure yesterday around 
9:30am. I think we may want to bump that heating coil for the MFCs a 
little bit. I have attached a screen shot of the temperature since 12/6, 
I believe the plan was to keep the temperature above 60 degrees.

I'll keep everyone informed on the progress.

-Marc
On 12/12/2017 10:58 AM, mdefurne wrote:
> Hi Marc,
>
> What are the news concerning the tests you wanted to run with the 
> spare Isobutane MFC?
>
> Kind regards,
>
> Maxime
>

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

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