Liquid level sensing system

摘要

A linear liquid level sensing system (10) comprises a vessel (20), an electrically conductive liquid (30) contained within the vessel (20), and a collector (40) spanning a vertical distance corresponding to the desired-level-determining range. An insulator (50) encases the collector (40) to define a dielectric gap between it and the fluid (30), with the insulated area in contact with the fluid (30) correlating with the fluid level. A single electrical line (60) connects the collector (40) to both a voltage-supplying source (70) and a charge-sensing device (80).

主权项

1. A linear liquid level sensing system comprising:
an electrically conductive liquid with an electrical ground, a collector spanning a vertical distance corresponding to a desired-level-determining range, an insulator encasing the collector and having a liquid-contacting area which changes with the level of the liquid; a voltage-supplying source which supplies a voltage to the collector so that the collector incurs a charge corresponding to the vertical level of the conductive liquid that is in contact with the liquid-contacting area of the insulator; a charge-sensing device configured to sense the collector-incurred charge, wherein the collector-incurred charge correlates to the liquid-contacting area of the insulator; and a single electrical line electrically connecting both the voltage-supplying source and the charge-sensing device to the collector such that the voltage-supplying source supplies the voltage to the collector through the single electrical line and the charge-sensing device senses the charge induced on the collector through the same single electrical line.