Microporous (0.35-0.7nm) accurate analysis requires two-stage turbo molecular pump. And nitrogen relative pressure P / P0 is able to reach up to 10-7_10-8. At the same time, it needs small-scale, high-precision pressure sensor (10 torr, 1 torr or 0.1 torr) of fair use. Mesoporous, macroporous pore size analysis, only a mechanical pump and 1000 torr pressure sensors can be realized the accurate analysis.
Microporous analysis, a theoretical model is used HK, SF, and DFT methods. Mesoporous, macroporous size analysis; the theoretical model is used BJH method, etc.