[Dsg-mvt] [New Logentry] Follow-up Re: issue with flowmeter reading

[beng at jlab.org]

Logentry Text:
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Per discussions with Maxime the logic for the MVT system has been changed to match the DC mixing setup.

Namely it uses a state machine to either have the flow increasing or decreasing based on two pressure setpoints. It still has a max pressure limit (set to 20 psig) where the flow will be set to 0, otherwise if the logic is as follows:

Increasing mode: if pressure >= PHigh go to decreasing mode, otherwise stay in increasing mode
Decreasing mode: if pressure <= PLow go to increase mode, otherwise stay in decreasing mode

Currently, PHigh = 16 psig & PLow = 8 psig


Since the buffer tank has an unknown quality mixture due to the previous fluctuations it probably should be vented and purged with Ar before starting again.

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