Patent ID: 8382221

Claim:
A system for sensing a level of fluid in a reservoir comprising: a first probe having a first active surface; a second probe having a second active surface facing the first active surface; a boot for electrically isolating the first probe and the second probe from the reservoir, the boot including a body portion supporting the first probe and the second probe; a sleeve extending outwardly from the body portion along the second probe; a third probe supported by the body portion of the boot; wherein the first probe includes a first shank portion extending outwardly from the body portion and supporting a first plate portion; the second probe includes a second shank portion extending outwardly from the sleeve and supporting a second plate portion; the third probe includes a third shank portion extending outwardly from the body portion and supporting a third plate portion; the first plate portion and the third plate portion are spaced apart from the second plate portion by a first distance; and at least a portion of the first shank portion and at least a portion of the third shank portion are spaced apart from the sleeve by the first distance; a memory in which data indicative of a conductivity curve and command instructions are stored; and a processor configured to execute the command instructions to associate a level of fluid in a reservoir with a signal indicative of electrical coupling between the first active surface and the second active surface with reference to the data indicative of a conductivity curve.