Reverse filling carbon and temperature drop-in sensor

A drop-in probe for determining phase changes by thermal analysis of a sample of a molten metal, the drop-in probe comprising:

• a measurement head including a first end which is an immersion end and an opposing second end having an end face, a body of the measurement head being formed of a first body half and a second body half configured to mate with the first body half along a parting line;
• a sample chamber arranged within at least one of the first body half and the second body half of the measurement head, the sample chamber being thermally isolated from a cooling mass of the measurement head, the sample chamber including a first thermocouple having a first hot junction enclosed within a metal wall, the metal wall having a thickness of 2.5 mm or less;
• and
• an inlet tube having an inlet opening of a diameter Dinlet, the inlet opening being spaced apart from the end face of the second end of the measurement head at a distance of at least
• D
• inlet
• 2
• ,
• wherein, when the sample chamber is filled with a sample of the molten metal, a ratio of a mass of the metal accommodated in the sample chamber to a mass of the metal wall of the sample chamber is greater than 2.6 and less than 6.