Presented by Micromeritics Instrument Corporation
The adsorptive gas supply valve (3) is closed and the vacuum (2) and sample (7) valves are open allowing the manifold and sample tube to be evacuated. The sample tube is not in the cold bath, so the sample is at ambient temperature.
When the necessary vacuum is achieved, valves 2 and 7 close and the cold bath is raised, cooling the sample to the analysis temperature.