| Lines 36-38 were replaced by lines 36-37 |
| - *Always measure the Helium level in the dewar before you take a Dewar away. The Level meter in the |
| - prepartion area shows the level in cm. Make sure that there is sufficient helium for filling. The dewars |
| - should be returned with a level of at least 8-10 cm. |
| + *The Level meter in the preparation area shows the level in litres. Make sure that there is sufficient helium for filling. The dewars |
| + should be returned with a level of at least 10-15 litres. |
| At line 40 added 1 line. |
| + |
| At line 42 added 9 lines. |
| + __Helium Dewar Transport:__\\ |
| + Helium dewars are brought into the experimental area with the 1T crane. |
| + *Only instructed people are allowed to use the crane. (A short training is offered by the LDM mechanics personal.) |
| + *Only dewars with pre-installed transport straps are allowed for crane transportation. |
| + *To extend the straps please use the proper extensions as shown in the picture below. |
| + |
| + | [transport extensions|HeDewartransport.png] | [dewar with transport fixtures|transportstraps.png] |
| + |
| + |
| Line 51 was replaced by line 60 |
| - *continue to lower the siphon into the transport dewar until you reach the bottom and lift it up by 10 cm |
| + *continue to lower the siphon into the transport dewar until you reach the bottom. |
| Lines 53-54 were replaced by lines 62-63 |
| - and open it. The dewar is now pressurized to 0.2bar over pressure. |
| - |
| + and open it. The dewar is now pressurized to 0.15 bar over pressure. |
| + *make sure not to empty the vessel completely, the people running the liquefier will love you. On the transfer line, normally there is a prolongation with a hole at 10 cm above the end. If not, you should lift the transfer line by 10 cm after inserting. |
| Line 64 was replaced by lines 73-84 |
| - |
| + !Returning Liquid Helium Dewars |
| + please return dewars to the dewar station as soon as possible after the transfer |
| + *connect the dewar to the rubber hose of the dewar station |
| + *open the manual valve to the recovery |
| + *open the manual pressure release that is connected to the recovery on the dewar |
| + *check the other manual pressure release. it MUST be closed |
| + *retighten the locking nut of the Helium extraction port |
| + *connect the level probe |
| + |
| + IMPORTANT: |
| + recheck that all valves are in the right state and the level is reading before you leave |
| + [afterfill.png] |
| At line 65 added 1 line. |
| + In case you are unsure about certain procedures, please contact sample environment staff |
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