초록 ▼

The parts of a measuring sensor include an electrode mounted on a conductive body and insulated therefrom. Part of the electrical capacitance between the electrode and the body is determined by the dielectric constant and conductivity of the material in which the electrode and body are immersed. A s

The parts of a measuring sensor include an electrode mounted on a conductive body and insulated therefrom. Part of the electrical capacitance between the electrode and the body is determined by the dielectric constant and conductivity of the material in which the electrode and body are immersed. A screening band is provided along part of the length of the electrode so as to shield the electrode from the electrical effects of the material so that only selected levels of material will affect the capacitance. The sensor is ideal for use in enamelled steel vessels.

대표청구항 ▼

An improved measuring sensor for capacitive measuring of liquid level in a vessel of the type having a first electrode band embedded in an enamel layer of a steel body serving as an opposite electrode, and where at least part of the capacitance between the first electrode band and the steel body is

An improved measuring sensor for capacitive measuring of liquid level in a vessel of the type having a first electrode band embedded in an enamel layer of a steel body serving as an opposite electrode, and where at least part of the capacitance between the first electrode band and the steel body is a function of the dielectric effects of a liquid in electrical proximity to the first electrode band, wherein the improvement comprises a metallic screening band (2) which is wider than the first electrode band and which is embedded in the enamel layer (3) between the first electrode band (1) and the enamel surface, said screening band covering only a portion of the first electrical band providing a screened range of the first electrode band shielded from the dielectric effects of liquid and an unscreened range so that only liquid levels corresponding to the unscreened range affect the capacitance of the sensor.