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Maintenance Procedures
- 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
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).
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.
- Cleaning QT purifier Nitrogen space
