| 摘要 |
PURPOSE:To measure the level of a water surface without temperature correction, by forming the configuration of a float so that the up and down movement of the float due to temperature change is offset by the change of the part, which is formed between the water surface and a level measuring position, based on the thermal expansion of the part. CONSTITUTION:Level meters 10, which are arranged at two points are connected by a communicating pipe 12. A container 11 is filled with water. A float 14 is floated on the water surface. A difference L between the water level and the height of a level measuring position is read by a level measuring device 18 through an arm 15 of the float. The float 14 comprises a part 14a which is always immersed below the water surface, and a part 14b which is always protruded above the water surface. The configuration of a part 14c of the float 14, which is contacted with the water surface, is formed, so that the change in the density of the water based on the temperature change and the displacement of the float 14 with respect to the water surface due to the thermal expansion of the float 14 are offset by the thermal expansion of a part, whose length is L, between the water surface and the level measuring position. Thus the level of the water surface can be accurately measured without temperature compensation. |
