| 摘要 |
PURPOSE:To achieve a higher measuring accuracy with less labor of a measuring person, by replenishing an assay section connected a measuring sample container with an adsorption gas at a fixed flow rate while a mass flow controller and a manometer are linked thereto to exhaust the desorbed gas. CONSTITUTION:A sample cell 2 is linked to an assay section 1 through a valve 11 and then, to an adsorption gas cylinder 6 through a valve 10 and a mass flow controller 5 while it is linked to a mass controller 7 through a valve 12. It is further linked to vacuum pumps 8 and 9 through valves 13 and 14 while being linked to a thermometer 4. First, after the assay section 1 and the system of the cell 2 are deaired, the cell 2 is immersed into a refrigerant layer 3 to calculate the dead capacity in the measuring system. Then, the desired sample is put into the cell 2 to determine the among of desorption after the simultaneous measurement of pressure and time and the specified surface product, tiny hole capacity and the like are calculated. This enables an unskilled measuring person to make an accurate measurement along with less labor.
|
