Patent ID: 9470571
Filing Date: 2016-10-18
CPC Classification: G01F

Claim Text:
1. A liquid level measuring device, comprising: an inner-tube unit having an inner tube and at least one inner-tube coil surrounding the inner tube; an outer-tube unit having a plurality of outer tubes, each outer tube having a plurality of outer-tube coils disposed thereon, the outer tubes being stacked along a vertical direction, the inner tube being arranged inside the outer tubes and being risen and fallen as a liquid level of a liquid in the outer tubes varies; and a control unit electrically connecting to the respective outer-tube coils, the control unit transmitting a set of position coded signals to the outer-tube coils disposed on an individual outer tube and transmitting the same set of position coded signals to the outer-tube coils of every one of the outer tubes sequentially, the at least one inner-tube coil generating an induced signal through electromagnetic induction with the outer-tube coils corresponding to a liquid level where the inner tube is at, the control unit determining the liquid level according to the induced signal generated by the at least one inner-tube coil and information about a height of one outer tube receiving the position coded signals at the time the at least one inner-tube coil generates the induced signal.