Patent ID: 7685863

Claim:
A device for measuring gas content in a molten metal, the device comprising an immersion end having a gas-collecting body, a gas supply line opening at the immersion end, and a gas discharge line for gases passing through the gas-collecting body, wherein the gas-collecting body contains materials, which in contact with the molten metal do not form liquid reaction products, wherein a portion of the materials which do not form liquid reaction products form at least a part of a surface of the gas-collecting body as a surface layer, which is provided for contact with the molten metal, and wherein the surface layer has a thickness of approximately 0.3 to 5 mm; and wherein one of the materials comprises a material which converts to AB 2 O 4 upon immersion of the device into molten iron or steel, wherein A is a metal selected from the group consisting of Mg, Fe and Mn, and B is a further metal selected from the group consisting of Al, Cr, Fe, and V.