| Lines 8-13 were replaced by lines 8-10 |
| - It might be necessary to open the needle valve more than |
| - usual in order to fill the pumping volume with some |
| - amount of liquid helium. Be aware, if the amount of |
| - liquid is too high, it might take hours to get a stable |
| - flow. |
| - * Open the 3 valves in the pumping line and the 2 valves in |
| + Open the needle valve to get a pressure at the 65 m3 |
| + pump of about 20 mbar. |
| + * Open the valves in the pumping line and in |
| Line 19 was replaced by line 16 |
| - * Open valve 9 (while pressing on the valve button, press |
| + * Open valve 9 (while pressing on the valve button, press |
| Line 22 was replaced by line 19 |
| - dump. It should read something around 660 mbar. |
| + dump. It should read something around 660(DIL1) or 400(DIL2) mbar. |
| Lines 35-38 were replaced by lines 32-38 |
| - * After some time (about 30 min when using the Variox) the pressure on |
| - G1 falls below 150 mbar, and it is time to pump out the dump: close |
| - valve 9, and open valve 14 for a short time (close it when P1 raises |
| - above 50 mbar). As soon as the pressure on P1 drops down, you might open |
| + * After some time (depends on the temperature of the mix. chamber) |
| + the mixing chamber should reach about 1 K, and then |
| + the pressure on G1 stabilizes at a low value. |
| + Now you may start to pump out the dump: close valve 9, |
| + and open valve 14 for a short time |
| + (close it when P1 raises above 50 mbar). |
| + As soon as the pressure on P1 drops down, you might open |
LIN