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- Close the hand valve from the pump
- Set the He gas cylinder to 10 psig
- Open VFill slightly
- Open the yellow color hand valve L7B while watching the gauge
- Once it's pressuresized (check pressure from the pump) close Vfill and L7B
- Close VBTv on the buffer tank
- Disconnect the line from the pump and connect to the purity meter
- Crack open VBTv and check the purity
- Open L7B and disconnect the purity meter