The invention relates to a
liquid storage tank material level indicating device with
signal long-distance transmission as well as a design method and material level calculating method of the indicating device, and belongs to the field of liquid material level detection. The indicating device lies in that a soft
rope A is connected with a floater and a driving
pulley of a double-wheel
pulley; a soft
rope B is connected with a driven
pulley of the double-wheel pulley and a counterbalance weight body, and the middle of the soft
rope B is connected onto a fixed pulley in a bridging manner; the driving pulley and the driven pulley of the double-wheel pulley are all fixed on the same pulley spindle; the pulley spindle is mounted on two bearings; one end of the pulley spindle is connected with a
potentiometer shaft sleeve through a shaft
coupling tube; the
potentiometer shaft sleeve is connected with a
potentiometer; the shaft
coupling tube is in movable connection with the potentiometer shaft sleeve; the middle of a soft rope C is hung on a reversing fixed pulley, and the two ends of the soft rope C are respectively connected with the counterbalance weight body and an indicating light bar; the indicating light bar can move up and down along a scaleplate; the power source of the indicating light bar is controlled by an optoelectronic switch and the indicating light bar is supplied with power through a flexible circuit conductor. According to the
liquid storage tank material level indicating device with
signal long-distance transmission as well as the design method and material level calculating method of the indicating device, provided by the invention, liquid level of liquid in a
liquid storage tank can be observed directly without needing labors to
climb up the
liquid storage tank, liquid level observation is not influenced by power failure, and a resistive
signal which has a
linear relationship with the liquid level is provided.