Abstract: A capacitive transducer for detecting the level of liquids and other materials has one or more antenna probes connected to an integrated chip normally associated with touch-screen displays. Each antenna probe operates independently and senses the level condition of wet or dry flowable materials such as water, oil, fuel, grain, and so on. The antenna probes may be formed as insulated conductive wires or conductive traces between layers of a stiff or flexible substrate, such as a PCB, with the substrate material serving as the insulating layers. Each antenna probe has a different length representing different depths of the material being measured to provide dynamic calibration of the level condition independent of the material type and ambient conditions.

Abstract: A capacitive transducer for detecting the level of liquids and other materials has one or more antenna probes connected to an integrated chip normally associated with touch-screen displays. Each antenna probe operates independently and senses the level condition of wet or dry flowable materials such as water, oil, fuel, grain, and so on. The antenna probes may be formed as insulated conductive wires or conductive traces between layers of a stiff or flexible substrate, such as a PCB, with the substrate material serving as the insulating layers. Each antenna probe has a different length representing different depths of the material being measured to provide dynamic calibration of the level condition independent of the material type and ambient conditions.

Abstract: A capacitive transducer for detecting the level of liquids and other materials has one or more antenna probes connected to an integrated chip normally associated with touch-screen displays. Each antenna probe operates independently and senses the level condition of wet or dry flowable materials such as water, oil, fuel, grain, and so on. The antenna probes may be formed as insulated conductive wires or conductive traces between layers of a stiff or flexible substrate, such as a PCB, with the substrate material serving as the insulating layers. Each antenna probe has a different length representing different depths of the material being measured to provide dynamic calibration of the level condition independent of the material type and ambient conditions.