Micromeritics TriStar II 3020 Operator's Manual page 380

Appendix G
3. Close all valves; then open valves 6, 7, and 10.
Open
valves 6, 7,
4. Allow evacuation to continue for 20 minutes. This pulls a vacuum on the helium line to the gas
bottle. The manifold pressure transducer should fall close to zero.
Be sure to allow evacuation for a full 20 minutes. If evacuation time is too short,
trapped air may remain in the lines.
5. Close valves 6, 7, and 10.
G-4
TriStar II 3020
302-42828-01 - Dec 2012