A calibration with an accurately weighed amount of CuO is required. Carry out first oxidation or TPO of the sample, and then H2-TPR with the same analytical conditions that are used for the analyses. Calculate the amount of hydrogen needed to reduce the sample mass (1 mole of hydrogen reduces one mole of CuO) and find the signal area/hydrogen consumed conversion factor. Beware that flow variations change the conversion factor. The factor is only valid for experiments under identical H2 flow conditions.