DIFFERENTIAL CAPACITANCE CONTINUOUS LEVEL SENSOR SYSTEMS

摘要

A liquid level measurement sensor system includes an inner covering (102), an outer covering (104) surrounding the outer periphery of the inner covering (102), a space defined between the inner and outer coverings, at least one outer capacitive sense element (106) positioned in the space between the inner and outer coverings, and at least one inner referential capacitive sense element positioned within the inner covering. The outer capacitive sense element (106) is configured to measure a liquid level. The inner referential capacitive sense element is configured to compensate for environmental changes. A method for measuring a liquid level in a tank includes taking a capacitance reading with an outer capacitive sense element, taking a referential capacitance reading with an inner referential capacitive sense element, comparing the capacitance reading with the referential capacitance reading to obtain a differential capacitance, and determining a liquid level with the differential capacitance.