Particulate Systems HPVA Series, Руководство оператора, Страница: 115 / 124

HPVA Series Operator’s Manual Conducting the Adsorption/Desorption Analysis
Mar 2011 B-13
10. Select the External Temperature Control Method radio button.
11. Enter the pressure steps that are desired for the sample to reach during analysis:
a. Enter or select a pressure in the Pressure field.
b. Click Add to add the pressure to the table.
12. Enter temperature settings similar to those used for the free space analysis.
13. Uncheck the Measure FS box.
14. Enter the Ambient free space from the free space analysis in the Ambient FS field.
15. Enter the Experiment free space from the free space analysis in the Exper FS field.
16. Set the Hold time to about 60 minutes, but no less than 45 minutes. This is necessary because
when the warm sample tube is submerged into a liquid cryogen bath, it takes at least 45 minutes
for the sample tube to equilibrate and create a stable temperature within the tube.
17. Click OK . The Experiment Definition: New window is displayed.
18. Open the sample isolation valve on the sample tube.
19. Click Run Experiment .
20. The software will prompt you to bring the sample tube to the desired analysis temperature.
21. Fill the dewar with liquid nitrogen to the top of the isothermal jacket,