| 摘要 |
The volume of solid or liquid material in a containing vessel or tank of any size or shape is indicated at a near or remote point by apparatus comprising a motor-operated reel mounted on the top of the vessel and having a cable wound on it carrying at its end a limit switch which is lowered into the vessel and is connected in circuit with the motor to stop rotation of the reel on contact with the upper surface of the contents of the vessel. A screw shaft rotates with the reel and carries a non-rotatable nut the extent of travel of which along the screw shaft is proportional to the depth through which the limit switch travels until it contacts the upper surface of the material. Means are provided for translating the extent of movement of the limit switch and nut into an indication of the volume of material in the vessel.
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