Programmable temperature of the electrode furnace (inert gas fusion principle), contact-free optical sensor for temperature measurement and precise control * Simple change-over by software from simultaneous oxygen and nitrogen measurement to the determination of hydrogen; external furnace for diffusible hydrogen as an option * High stability detection system with NDIR detector for CO and thermal conductivity cell for N2 and H2 with automatic base line control and optimum range selection for all elements * Optional automatic furnace cleaning with dust removal, automatic crucible changer and sample loader * Optional quadrupole mass spectrometer for diffusible Hydrogen for the measurement of ultra-low hydrogen concentrations and the study and characterization of hydrogen traps in steel