CAPACITIVE LEVEL SENSOR

摘要

A capacitive liquid level sensor in which a vessel for receiving the liquid has a deflector inside the vessel extending upwardly from the base, and which tapers towards its top. This means the liquid is confined to the edges of the vessel at the bottom of the vessel, which gives improved resolution for small amounts of liquid. The deflector also acts as a baffle resisting liquid flow when there is tilting of the vessel.

主权项

1. A liquid level sensor comprising:
a vessel for receiving the liquid having a base; a capacitor arrangement for detecting the liquid level in the vessel based on the permittivity of the liquid and the height of the liquid in the vessel; and a deflector inside the vessel extending upwardly from the base, having a greatest area, in a plane perpendicular to the vessel height, at the base and decreasing in area towards the top of the deflector.