AUTOMATIC HYSTERESIS CORRECTION FOR ELECTROMECHANICAL LEVEL GAUGES
摘要:
An automatic hysteresis compensated method of level measuring a liquid in a tank includes providing an electromechanical liquid level gauge including a controller with a processor, a displacer on a wire from a measuring drum with a motor, where the processor controls a movement of the motor and executes a level gauging algorithm. A measured force displacer position (FS) profile is provided including a move-down FS curve determining Fd, Sd corresponding to a displacer center when moving down and a move-up FS curve to determine Fu, Su corresponding the displacer center when moving up. The algorithm provided a time derivative of F is essentially zero, initiates performing a down/up dip of the displacer moving the displacer down/up to below/above the liquid level, then moving the displacer up/down passing Su/Sd, then moving the displacer to return to Sd/Su, and determining the current liquid level from Fd/Fu upon the return to Sd/Su.
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