A device for monitoring a liquid level of a liquid storage tank for a vehicle is capable of improving sensing sensitivity of a liquid level sensor by employing a structure capable of amplifying an electromotive force, which is generated by an electrode, at an electromotive force amplification layer including a carbon micro coil (CMC) and accurately sensing a frozen state of a liquid to perform a heating function so as to resolve the frozen state of the liquid.

Methods and systems for sensing a fluid level associated with an engine are described. The method comprises generating an input signal and applying the input signal to a resistive portion and a capacitive portion of a fluid level sensing device, measuring a first varying output of the resistive portion of the fluid level sensing device through a first channel of a controller of the engine, measuring a second varying output of the capacitive portion of the fluid level sensing device through a second channel of the controller of the engine, and translating at least one of the first varying output and the second varying output into a level of fluid and outputting the level of fluid.

A device for cleaning an end face of an optical fiber may apply a vacuum to a solvent tank, where the device includes a vacuum generator to apply the vacuum and the solvent tank. The device may receive, from a solvent reservoir and in response to applying the vacuum, solvent with the solvent tank. Additionally, or alternatively, a device for cleaning an end face of an optical fiber may apply a pressure to a solvent reservoir, where the device includes a pressure port to apply the pressure and a solvent tank. The device may receive, from the solvent reservoir and in response to applying the pressure, solvent with the solvent tank.

A device for cleaning an end face of an optical fiber may apply a vacuum to a solvent tank, where the device includes a vacuum generator to apply the vacuum and the solvent tank. The device may receive, from a solvent reservoir and in response to applying the vacuum, solvent with the solvent tank. Additionally, or alternatively, a device for cleaning an end face of an optical fiber may apply a pressure to a solvent reservoir, where the device includes a pressure port to apply the pressure and a solvent tank. The device may receive, from the solvent reservoir and in response to applying the pressure, solvent with the solvent tank.

The present invention comprises a novel foldable and intrinsically safe plate capacitive sensor to measure liquid depths, solids in liquid depths, and two different liquids depths. This invention is used in onsite wastewater management systems (OWTS) to monitor depths of solids, oil, and effluent in a wastewater tank. The plates are configured to allow for solids, liquids and gases to surround the plates. A number of plates are hung in series from near the OWTS tank lid to at least 18 inches below the output baffle to measure the different materials at different depths in the OWTS tank. The capacitive sensors are capable of use with various materials to measure solids, oil, and effluent depths in an OWTS tank.

A fluid level detector is provided, which has a transmitter, a receiver, and a sensing zone adjacent the transmitter and receiver. The transmitter and receiver are arranged such that when an electric field forms between the transmitter and receiver, a fringe electric field extends from the transmitter into the sensing zone. The transmitter and receiver are both on a same side of the sensing zone, and a fluid located at the sensing zone changes a measured capacitance at the transmitter and receiver system.

A fluid level detector is provided, which has a transmitter, a receiver, and a sensing zone adjacent the transmitter and receiver. The transmitter and receiver are arranged such that when an electric field forms between the transmitter and receiver, a fringe electric field extends from the transmitter into the sensing zone. The transmitter and receiver are both on a same side of the sensing zone, and a fluid located at the sensing zone changes a measured capacitance at the transmitter and receiver system.

A cup for measuring the liquid intake of an individual. The cup comprising: a liquid holding portion, defined by at least one sidewall and a base; a liquid level sensor, comprising a plurality of conductive surfaces disposed in an array along the sidewall in a direction away from the base; and a processor, configured to derive a liquid level from the liquid level sensor by determining which of the plurality of conductive surfaces have a capacitance higher than a threshold value, the threshold value being indicative of the respective conductive surface being below a liquid level line, and thereby measure the liquid intake of the individual.

Systems and methods for non-contact sensing of the level of process fluid within a hygienic bubble trap are contemplated. In particular, it is contemplated that through the use of one or more capacitance probes having their sensor tips placed adjacent to the vessel wall of a hygienic bubble trap, ideally perpendicularly thereto, the fluid level of the process fluid within the hygienic bubble trap may be measured via the circuit of the capacitance probe detecting variances in the electrical field which extends through the vessel wall, as a result of changes in the dielectric as the process fluid rises and falls. In this fashion, the probe is not wetted and is never placed into physical contact with the process fluid, and thus does not need to undergo any clean-in-place or sterilize-in-place processes, greatly simplifying ease of use.

A recording apparatus includes a storage unit, a first electrode, a second electrode, and a circuit. The storage unit stores a liquid or powder to be supplied to a recording portion configured to perform recording. The first electrode is positioned on an outer surface of the storage unit. The second electrode is positioned away from the storage unit. The circuit is connected to each of the first electrode and the second electrode.