| 摘要 |
A method of indicating a predetermined level of a molten fluid contained in an ingot-forming member for forming the molten fluid into an ingot when it cools is disclosed. The ingot-forming member has a molten fluid receiving end, an inner wall, an outer wall and a top wall bridging the inner wall and the outer wall. The method includes the steps of: (a) providing a support member in loose fitting engagement with the ingot-forming member and having an outside support portion adjacent the outer wall, an inside support portion adjacent the inner wall and a bridging support portion adjacent the top wall for connecting the outside support portion and the inside support portion; and (b) mounting a float member on the free end of the inside support portion to extend inwardly from the inner wall at the predetermined level substantially parallel to the level of the fluid line of the molten fluid. The float member has a molten fluid contact volume so that the mean density of the sum of the weights of the support member and the float member per unit of volume of the contact volume is less than the mean density of the molten fluid and so that when the molten fluid engages the float member the support member moves away from the top wall of the ingot-forming member thereby giving a visual signal of the molten fluid reaching the predetermined level. The float member is formed of a material having an ignition temperature lower than the temperature of the molten fluid so that the float member is partially consumed upon contact with the molten fluid thereby decreasing the weight of the indicating device and produces downward flowing gases from the float member against the molten fluid to aid in the elevation of the float member thereby speeding up the visual signal.
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