Liquid state detection sensor

摘要

A liquid state detection sensor capable of detecting a large number of objects with a small number of terminals. The liquid state detection sensor is provided with three terminals A to C, a capacitor C1 between terminals A and B, a capacitor C2 between terminals B and C, and a capacitor C3 between terminals A and C. The capacitor C1 and the capacitor C2 are connected in series, and the capacitor C3 is connected in parallel with this series connection. The capacitor C1 is disposed outside liquid fuel in a fuel tank, the capacitor C2 is partially or wholly immersed in the fuel in the fuel tank, and the capacitor C3 is disposed close to a floor of the fuel tank.

主权项

1. A liquid state detection sensor comprising:
n terminals, n being a natural number that is at least 3; and at least n capacitance measurement portions provided between the terminals of respectively different combinations of the terminals, wherein the capacitance measurement portions are disposed on a single board, and the capacitance measurement portions include:
a first capacitance measurement portion that is permanently disposed within a measured liquid in a fuel tank;a second capacitance measurement portion that is for measuring a liquid level of the measured liquid; anda third capacitance measurement portion that is permanently disposed outside the measured liquid.