Maintenance Procedures

1.  Cleaning QT purifier Helium-space (This needs to be done periodically because the purifier will be blocked by the contaminants from regular air)
   
   a) Change the operation to "Manual" + "Run" mode, and close the SV01 and SV03 valves: also close the BV02 hand valve and REGX regulator on the liquefier manifold
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   b) Make sure to boil off and vent all the LN2 before the pumping-purging procedure. Use the heater if necessary (tap on the small bar located bottom of the purifier sign: orange color indicates that heater is ON).
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   c) Connect the pump to the outlet from V10a (currently we use the Edwards pump which is connected to the Helium recovery manifold pipe) with a pressure gauge, hand valve, and a Helium gas bottle (to backfill).
        Keep the V9a closed during pumping and purging.
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2.   Cleaning QT purifier Nitrogen space