Self-calibrating liquid level transmitter

Abstract From the Canadian patent

The present application provides a fluid level sensing apparatus for placement in a container comprising a sensor further comprising an electrically conductive first body an insulating layer having a thickness disposed over the first body to cover a first surface contact area an electrically conductive second body having a second surface contact area disposed in opposition to the first body; a container progressively filled with a fluid in order to change a fluid level; a means for energizing the first body and the second body at a voltage; and a means for detecting the variability in voltage as the fluid level changes wherein the thickness of the insulating layer varies along the first …