A laboratory test apparatus was used to obtain adsorption onto granular activated carbon at temperatures between 50 degrees C and 130 degrees C. Despite the kinetic advantage of activated carbon cloth, which was solely investigated in the apparatus before, it is shown that by a new sample holder it is also possible to obtain adsorption isotherms onto granulated activated carbon fast, economically and within a large measuring range. Measurement results, namely adsorption isotherms, were evaluated by the ALI(c) model as well as by the models of Dubinin-Asthakov, Toth and Do&Do. The model equations were evaluated regarding their fitting quality and further criteria.