Line 24 was replaced by line 24 |
- *Make sure that you wear protective leather gloves when handling cold parts. |
+ *Make sure that you wear protective leather gloves when handling cold parts, however the gloves should never be soaked with LN2 or LHe. |
At line 25 added 1 line. |
+ |
Lines 35-37 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 39 added 1 line. |
+ |
At line 41 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 50 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 52-53 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 63 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 64 added 1 line. |
+ In case you are unsure about certain procedures, please contact sample environment staff |