Jntti introduced a method to reduce the time required for the stepwise measurement of adsorption isotherms. After each pressure
change he measured the adsorbed mass three times and calculated its equilibrium value at the new pressure. In the present
paper, we discuss the applicability of this method in a broader scope without starting from a given combination of sorptive
and adsorbent and the influence of measuring inaccuracies. The method is applied to detect whether the adsorption process
is based on more than one adsorption mechanism or not.