Patent ID: 8596119
Filing Date: 2013-12-03
Classification: G01F

Abstract:
1. A liquid level measurement device, comprising: a sensor adapted to receive a force and configured, upon receipt of the force, to generate a sensor output signal representative of a level of liquid in a reservoir; a force transfer mechanism disposed adjacent, and movable relative to, the sensor, the force transfer mechanism configured to receive a buoyancy force and, upon receipt thereof, to transfer the buoyancy force to the sensor; a float member movable relative to the sensor, the float member having a first end and second end, the first end disposed adjacent the force transfer mechanism, the float member configured, upon the second end being submerged into the liquid to a depth, to have a buoyancy force exerted thereon by the liquid, the buoyancy force having a magnitude proportional to the depth, the float member further configured to supply the buoyancy force to the force transfer mechanism; a sensor die configured, upon receipt of the force, to generate a sensor die output signal; a signal processing circuit coupled to receive the sensor die output signal and configured, upon receipt thereof, to supply the sensor output signal representative of the level of liquid in the reservoir; a circuit board on which the signal processing circuit is mounted; an insert carrier coupled to the circuit board; and an insert coupled to the insert carrier and on which the sensor die is mounted, wherein the insert carrier and insert comprise materials having at least substantially equivalent coefficients of thermal expansion (CTE).