The knowledge of the hydrogenHydrogen content in liquid aluminiumAluminium alloys is a prerequisite for an effective control of the degassingDegassing efficiency and therefore the quality of the final product. This paper describes the procedure and the results of an extensive benchmark study on the most common devices for online measurement of hydrogenHydrogen in castingCastings launders, AlscanAlscan and HycalHycal . Both devices were tested in lab scale experiments at various known hydrogenHydrogen levels, which were established by purging with different reference gas mixtures until equilibrium. In addition, extensive tests were carried out in a pilot castingCastings facility as well as in a production cast shop on different alloys and in various positions between holding furnace and castingCastings station. The results of these tests as well as the consequences for the following implementation and automation of the selected device are part of this paper.
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- Benchmark and Practical Application of State of the Art Hydrogen Monitoring
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