To provide a unit for measuring a molten material surface level in a vertical type furnace allowing highly accurate measuring of the surface level of a molten material in the furnace and a measuring method therefor.
At least four electrodes 21-24 are set in the vertical direction at a side of a furnace bottom part of the vertical type furnace. The upper most electrode 24 and the lower most electrode 21 out of the electrodes supply current as current supplying electrodes, and the electrodes other than the current supplying electrodes measure the electric potential difference as electric potential difference detecting electrodes. The surface level of the molten material is measured based on the measured electric potential difference or an electric resistance value calculated from the electric potential difference. A conductive refractory 11 is used at a portion where the electrodes are set in the vertical type furnace. The conductive refractory 11 is set to be in contact with molten metal accumulated at a lower part of the furnace and molten slag on a face of the furnace inner side, and on faces other than the face on the furnace inner side, the conductive refractory 11 covered by being in contact with a material having lower electric conductivity than itself.
NAGAMUNE AKIO
TANAKA HIROSHI
ISHIKAWA MASARU
NIPPON CHUTETSUKAN KK
Kiyoshi Yasushima
Souji Sasaki
Noboru Omura
Takanashi Norio