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1. Close MV101 (supply) and MV102 (return) 
2. Connect a He cylinder to L3 (Helium purge inlet) - Regulate 10 psig

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      3. Open Vmup

      4. Ensure V30, V35, V9a, V21a, V11A, V14, SV03, REGX are open

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      5. Open VHSV and the rotatable valve on the top of the line

      6. Check the gauge and make sure that it reads 10 psig

      7. Start HR3

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      8. Slowly open V17 and vent

Measuring the purity:

Measure from SVSAMPLE or at the vent near V17

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Turning OFF HR3 after purging:

1. Press the Emergency Stop and right after that close V17 (Flow on FI01 will be zero)

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     2. Close SVSAMPLE

     3. Close VHSV and the rotatable valve on top of the line

     4. Close Vmup

     5. Close the bottle