LEVEL INDICATOR Russian patent published in 2013 - IPC G01F23/28 

FIELD: measurement equipment.

SUBSTANCE: level indicator comprises a section of a long line submerged into liquid and made in the form of a rectilinear rod, a generator of probing microwave pulses, the outlet of which is connected with the upper end of the section of the long line, a receiver, the first amplitude selector, a meter of time intervals, and a level calculator. At the same time the upper end of the section of the long line is connected to the inlet of the receiver, the outlet of which is connected to the inlet of the first amplitude selector, the reference outlet of the generator of probing microwave pulses and the outlet of the first amplitude selector are accordingly control inlets of the start and stop meter of time intervals, the outlet of which is connected with the first inlet of the level calculator. The section of the long line has regular discontinuities along its length, representing bulges of the rectilinear rod, and the level indicator is equipped with a calibration unit connected between the receiver and the level calculator, and comprising serially connected second amplitude selector and a digital period meter, at the same time the inlet of the second amplitude selector is connected to the outlet of the receiver, control start and stop inlets of the digital period meter are connected accordingly to the reference outlet of the generator of probing microwave pulses and the outlet of the first amplitude selector, and the outlet of the digital period meter is connected with the second inlet of level calculator.

EFFECT: improved accuracy of liquid level measurement.

2 dwg