By this method the Seebeck coefficient is measured relative to Alumel. In order to calculate the absolute Seebeck coefficient Platinum is measured relative to the Alumel wire over temperature.
Data for the absolute Seebeck coefficient is available on literature: Cusack, Kendall “The Absolute Scale of Thermoelectric Power at High Temperature“ Proceedings of the Physical Society 72 (5): 898. (1958)
