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Cleaning the 70K Trap


\begin{shaded}
\begin{itemize}
\item {\bf HOW OFTEN:} As needed or after scrub...
...{\bf SYSTEM STATUS:} The
mixture closed in the tank.
\end{itemize}\end{shaded}

  1. Disconnect the self sealing hoses from the top of the 70K trap, by pushing the largest ring along the hose and pulling the body of the hose away. Do this as quickly as possible, to minimize the chance of contamination from the air. enumerate
    ---Be careful not to touch the needle tip of the self sealing hoses.---
    enumerate
  2. Connect the hoses together to protect them from leaking.
  3. Remove the cold trap from the cold trap dewar.
  4. Next attach the quick connect-KF adapter to the end of a vacuum line, and the other end of that line to the red pump cart. DO NO ATTACH THE COLD TRAP YET.
  5. Turn on the roughing pump and pump out the vacuum line.
  6. Then attach the cold trap to the pump.
  7. Allow several hours for the cold trap to warm up to room temperature.
  8. Heat the trap using a heat gun, but do not exceed 100$ ^\circ$ C.
  9. While still under vacuum, disconnect the trap from the vacuum.
  10. Place the cold trap back in the LN$ _2$ .
  11. Wait two hours for the trap to cool and reconnect it to the mixture lines. Avoid touching the needle tip of the self sealing hoses. Make the connections as quickly as possible, to avoid leaking in air. enumerate

    ---Be careful not to touch the needle tip of the self sealing hoses.---

    enumerate

  12. Scrub the mixture remaining in the lines, ([sec:maint.scrub.small]see § sec:maint.scrub.small).


next up previous contents
Next: Cleaning the 4K Trap Up: Maintenance Previous: Filling the Trap Dewar   Contents
Jonathan Ouellet 2014-08-26