Abstract: An impeller for moving liquid through a pump system having a body, at least one vane extending from the body and capable of moving liquid through the system during rotation thereof, and a tapered, abradable tip extending from the vane wherein, during rotation of said body, the tapered end of abradable tip wears away in response to contact with the pump housing to produce a reduced amount of abradable material circulating through the system while providing nominal operational clearance between the tip and the housing to improve pumping efficiency.

Abstract: A pressure sensor system includes a first conductive surface electrically isolated from a second conductive surface. A dielectric material is interposed between the first conductive surface and the second conductive surface. The dielectric material is movable with respect to at least one of the first conductive surface and the second conductive surface in response to a change in pressure exerted on the pressure sensor. A measurement system is connected to at least one of the first conductive surface and the second conductive surface to measure the capacitance between the first conductive surface and the second conductive surface representative of pressure.