Drop-in probe

摘要

A drop-in probe is provided for determining phase changes of a sample removed from a molten steel by thermal analysis. The probe includes a measurement head that has an immersion end and in which is arranged a sample chamber having an inlet opening and a thermocouple projecting with its hot solder joint into the sample chamber and having a cable bushing for signal cables of the thermocouple. The cable bushing emerges from the measurement head out of a discharge opening on an end of the measurement head opposite the immersion end. A straight line between the immersion end and the discharge opening forms a longitudinal axis of the measurement head, and a theoretical plane through the hot solder joint and through a part of the inlet opening farthest away from the immersion end is formed perpendicular to the longitudinal axis. The probe is characterized by either a) the measurement head has a density of at least 7 g/cm3 between the immersion end and the plane farthest away from the immersion end or b) the measurement head has a density of at least 7 g/cm3 between the immersion end and an auxiliary plane formed at a distance of at least 10 mm and parallel to the plane farthest away from the immersion end.

主权项

1. A drop-in probe for determining phase changes by thermal analysis of a sample removed from a molten steel, the drop-in probe comprising a measurement head having an immersion end, a sample chamber arranged in the measurement head and having an inlet opening, a thermocouple projecting with its hot solder joint into the sample chamber, and a cable bushing for signal cables of the thermocouple, the cable bushing emerging from the measurement head out of a discharge opening on an end of the measurement head opposite the immersion end, the thermocouple being held in the sample chamber with a gas-permeable material,
wherein the cable bushing and the discharge opening are connected to the sample chamber in a gas permeable way via the gas-permeable material, wherein a longitudinal axis of the measurement head extends between the immersion end and the discharge opening and a plane extends through the measurement head perpendicular to the longitudinal axis between the immersion end and the discharge opening, a portion of the measurement head which is bounded between the immersion end and the plane having a density of at least 7 g/cm3, wherein the inlet opening opens in a surface of the measurement head distal from the immersion end and proximate to the plane, and wherein a total density of the measurement head equals less than 7 g/cm3.