Actually I'm working on designing a BET Machine of my own so I've prototype , the problem I faced that during dosing of N2 in manifold what should be the dosing pressure , is it depend on adsorbent or any characteristics of adsorbate itself.
It depends on the type of pores. Different pores adsorb different amounts at different pressures. For example, small pores adsorb a lot at low pressures, so they are in general more difficult to measure. Look at an adsorption isotherm and you will have a general idea of how much will be adsorbed at each pressure. If I was you I would start with some moderate amount (say, 100 mg) of a non-porous solid.
This publication show the rates at which different solids can adsorb:
Article Measuring adsorption isotherms with a flowmeter and a pressu...
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