[Dsg-dc] DC Gas Mixing

[Marc McMullen]

I had an incomplete sentence;

After both mixing systems have been calibrated, we will observe the 
mixture and buffer tank CO2% levels to see if it changes. This will take 
up to 5 volume exchanges to see any effect.


On 10/11/2018 4:37 PM, Marc McMullen wrote:
>
> DSG held a training session with Hall B Mechanical this morning. The 
> topic was calibrating the DC gas mixture to the 10% CO2/ 90% Ar 
> premixed standard.
>
> The premixed gas standard is used as the direct reference for the 
> current value (in mA) of the gas mixture; 10% CO2/ 90% Ar.
>
> Today's training was done only using Mix 1, as it has the only working 
> thermal conductivity gas analyzer. All measurements were taken using 
> the Mix 1 analyzer.
>
> The gas standard and mix values are very close (~8.4mA, ~2.74V), 
> however, the sample coming from the buffer tank (R1 MFC output) 
> indicates a higher CO2%.
>
> Monday Hall B Mechanical will be able to connect the Mix 2 gas sample 
> line to the manifold which is connected to Mix 1 analyzer. At that 
> time we will isolate and zero all mixing MFCs and run the calibration 
> tests on both mixing systems. After both mixing systems have been 
> calibrated
>
> Hall B management should consider purchasing a replacement for the 
> CLAS 6 (purchased mid 90s, last calibrated in 2000) analyzers for both 
> mixing units (starting at $3700 per unit), and additional units for 
> the output of the tanks.
>
> The results of the analysis were as follows:
>
> -- 
> Marc McMullen
> Detector Support Group
> 757-269-7738
>
>
> _______________________________________________
> Dsg-dc mailing list
> Dsg-dc at jlab.org
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-- 
Marc McMullen
Detector Support Group
757-269-7738

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