LIQUID LEVEL DETECTOR FOR OPEN VESSEL AND CLOSED VESSEL

摘要

A liquid level detector includes: a detecting element having one surface and the other surface opposite to the one surface, the one surface being opposed to a liquid, while being parallel to a height direction of liquid level; a Peltier element provided on the other surface side of the detecting element; and a control unit performing a detection processing for a liquid level of the liquid. The Peltier element forms a heat flow passing through the detecting element from the other surface to the one surface, toward the liquid or a gas. The control unit calculates a liquid level on the basis of an output value of an electrical signal outputted according to the heat flow passing through the detecting element, and a relationship between an output value of the detecting element and a liquid level.

主权项

1. A liquid level detector, comprising:
a detecting element having a first surface and a second surface opposite to the first surface, the first surface being opposed to a liquid to be detected, while being parallel to a height direction of liquid level; a heating means provided to a second surface side of the detecting element; a detection processing means performing a detection process for a liquid level of the liquid; a single sensor unit configured with a single detecting element, a length of the single detecting element in a height direction of liquid level being equal to a detection range of liquid level; a plurality of first and second via holes formed in the detecting element and penetrating an insulating substrate of a thermoplastic resin in a thickness direction; and first and second interlayer connection members embedded in the detecting element while being formed in the first and second, via holes with metals different from each other, wherein: the heating means forms a heat flow passing through the detecting element from the second surface to the first surface, toward the liquid or a gas; the detecting element has a structure in which the first and second interlayer connection members are alternately connected in series, generates, in the first and second interlayer connection members alternately connected in series, an electromotive force corresponding to the heat flow passing through the detecting element, and outputs an electrical signal corresponding to the electromotive force to the detection processing means; and the detection processing means calculates a liquid level on the basis of an output value of the detecting element, and a relationship between an output value of the detecting element and a liquid level.