* This document contains the complete instructions to fill the CCD's dewar with liquid nitrogen. [https://svn.mpia.de/trac/gulli/king/attachment/wiki/WikiStart/Instructions-LN2/002-1.0-Instructions_to_fill_with_LN2_the_CCD's_dewar.pdf  Instructions to fill with LN2 the CCD's dewar] 

To have access to the telescope you must first attend a short introduction in the safe handling of LN2 and how to run the vacuum pumps. This written procedure cannot replace the personal introduction but can summarize what you should have learned.


   * Pumping Procedure quick guide
This is a quick guide to not forget the main steps.

It does not substitute the training with Werner Laun nor the instructions you can find in the previous link.

There is copy of this sheet hanging on the vacuum set. 

[[Image(70cmTeleskop-Pumping-procedure-1.png, middle, width=900,margin-right=30)]]