A self-cleaning sensor to determine a level of a liquid includes a tube with an interior coating and a plurality of horizontally aligned, electrically isolated, electrical contacts. The self-cleaning sensor includes the plurality of horizontally aligned, electrically isolated, electrical contacts that each terminate in an outer surface of an interior wall of the tube and are electrically connected to one or more electrical devices in a cap residing on the tube. Additionally, the self-cleaning sensor includes a float that is composed of a low density, low dielectric constant material buoyant in one or more liquids to be measured where each horizontal dimension of the float corresponds to each horizontal dimension of the tube.

A fluid reservoir may include a number of metal traces along a wall of the fluid reservoir, and a number of fuse circuits along a length of the metal traces. Each of the fuse circuits may include a fuse along a length of a respective metal trace, and a number of parasitic resistive elements in parallel to the fuse. The parasitic resistive elements reduce current flow through the fuse in the presence of a fluid contained within the fluid reservoir.

A submersible member can include an elongated body defining an outer body surface, the body defining a top end and a bottom end; a base electrode extending through the outer body surface; a first conductive member extending through the body from the top end to the base electrode, the first conductive member connected in electrical communication with the base electrode; an indicator electrode extending through the outer body surface, the indicator electrode positioned between the top end and the base electrode; and a second conductive member extending through the body from the top end to the indicator electrode, the second conductive member connected in electrical communication with the indicator electrode.

A liquid level measurement circuit includes: a probe, a reference electrical signal module and a potential conversion module, where the probe extends into a liquid level accommodation body, and the liquid level accommodation body accommodates a measurement liquid module. If the liquid level of said liquid is lower than a preset liquid level, a positive electrode conductor and/or a negative electrode conductor are/is not immersed in the measurement liquid, and an output end of the potential conversion module outputs a first electrical signal; and if the liquid level of the measurement liquid is not lower than the preset liquid level, the positive electrode conductor and the negative electrode conductor are immersed in the measurement liquid, and the output end of the potential conversion module outputs a second electrical signal. The accuracy of liquid level measurement can be improved.

Method, system, apparatus, and/or device for determining when the dewar is filled with a medium. The fill gauge level apparatus includes a cylindrical body. The cylindrical body has a base on one end, a flange on an opposite open end and a cavity. The fill gauge level apparatus includes a fill gauge level device. The fill gauge level device is coupled to the cylindrical body and is positioned within the cavity. The fill gauge level devices includes a sensor for measuring a medium within a shipper. The fill gauge level devices includes an indicator. The indicator provides an indication when the medium has been filled to a threshold level within the shipper.

The present invention relates to a biosensor capable of determining whether the sample addition amount is sufficient. The biosensor at least comprises an insulating substrate, a working electrode and a fill detection electrode. The fill detection electrode is further away from the sample supply port of the biosensor than the working electrode, and the fill detection electrode is not in contact with a sample supply channel. The biosensor of the present invention can determine whether the sample amount added to the biosensor meets detection requirements, which effectively avoids the risk of insufficient sample amount and ensures the accuracy of test results.

A device for measuring the liquid level inside a tire that includes a stem of a tire pressure valve that includes a first electrode, a second electrode, and an isolated part between the electrodes, a power source, and an electric circuit. The stem is fixed to the rim of the tire in a way that the electrodes' upper parts protrude outside the rim and the electrodes' lower parts protrude inside the rim. The lower parts are immersed inside the liquid inside the tire when the tire pressure valve faces the ground. The electrodes' upper parts are connected to the power source and to the electric circuit that measures an electric property of the liquid between the lower parts of the electrodes, and the intensity of this property represents the liquid level and can be used for calculation this level.

A liquid surface detector includes a tube through which a liquid passes; an electrode pin disposed on an inner wall of the tube; and a ground pin disposed on the inner wall of the tube. In the liquid surface detector, the electrode pin and the ground pin are disposed in different directions as viewed from an axial direction of the tube.

Embodiments generally relate to froth measurement apparatus, and related methods and systems. An example apparatus comprises: an elongate first housing portion; and a series of sensor probes positioned along the first housing portion, each of the sensor probes having a probe body extending away from the first housing portion by a distance and comprising first and second electrodes for measuring changes in electrical potential associated with froth and/or bubbles. The sensor probes comprise signal processing circuitry coupled to the probe bodies to receive analog output signals from the probe bodies and to generate digital output signals based on the analog output signals. The apparatus comprises at least one processor configured to receive the digital output signals or sensor information based on the digital output signals and configured to determine at least one froth parameter over a sampling period based on the digital output signals or the sensor information.

An electronic fuel level indicator includes an elongated circuit board containing multiple elongated slots separated by a land segment of the circuit board, and an elongated wire spanning across the slots and being clamped to the land segment. Another aspect provides at least one elongated polymeric and/or insulating cover retained against a circuit board and a portion of the wire solely by insertion of the circuit board and cover within an elongated hollow tube through which fluid may flow. A method of assembling an electronic fluid level indicator is also provided.