CONTROL METHOD OF DISCRETE LIQUID LEVELS AND SYSTEM (DEVICE) FOR ITS IMPLEMENTATION Russian patent published in 2011 - IPC G01F23/00 

FIELD: instrument making.

SUBSTANCE: method involves arrangement of level gauges with sensors at control points in the capacity, cyclic alternative connection of sensors to measuring device, measurement of parameters of all transmitters in upward direction or in downward direction at each scanning cycle, averaging of measured values per certain time interval, transfer of information signal on the state of transmitters and connection of neighbouring transmitters as the parameters of transmitters change at immersion into or removal from liquid. Every four sensors are connected to each other into measuring circuit on printed-circuit board from which signals are supplied via measuring channel to input of measuring device the controller of which connects outputs of measuring circuits in turn and cyclically and determines medium (liquid or gas) at check point as to the signal value by comparing it to threshold value. When the first and the second sensors connected to the first measuring circuit exceed liquid-gas boundary, signal is increased; when the third and the fourth sensors connected to the second measuring circuit exceed liquid-gas boundary, the signal is increased; when the fifth and the sixth sensors connected to the first measuring circuit exceed liquid-gas boundary, the signal is decreased; when the seventh and the eighth sensors connected to the second measuring circuit exceed liquid-gas boundary, the signal is decreased. At the change of level change direction there excluded is ambiguity of determination of gas or liquid medium at check point owing to certain location and connection of sensors to the measuring circuit. The method is implemented with the system (device).

EFFECT: decreasing mass and dimensions parameters of control system of cryogenic fuel levels owing to reducing the number of pressure seals and connection wires used for connection of transmitters, at maintaining the accuracy and quick action of the system; increasing the number of measuring points the liquid level of which is controlled with one measuring device.

2 cl, 4 dwg