A system includes a container having an inner chamber for storing fluid, at least one measuring probe arranged within the chamber and one ground probe arranged within or near a bottom of the chamber. There is at least one impedance electrically connected with a processor which is electrically connected with the at least one measuring probe. A signal generator has a first voltage terminal electrically connected with the at least one impedance and a second voltage terminal electrically connected with the ground probe. When a signal is sent from the signal generator to the measuring probe, an electrochemical reaction occurs at the measuring probe and ground probe and stores a charge if the measuring probe and/or ground probe are immersed in fluid. The processor measures the voltage, current and power of the signal to calculate the resistance and capacitance of the fluid within the container to determine the level of fluid in the container. A method for measuring the level of fluid in the container includes the steps of applying at least one time-varying voltage signal to the one or more measuring probes, creating an electrochemical reaction between the ground probe and each measuring probe, storing energy around each probe that is submerged in fluid, measuring the current and power of the signals, and determining the level of fluid in the container based on the calculated capacitance and resistance of the fluid within the container.

A sensor assembly that includes a sealed housing. A printed circuit board assembly including a first section that includes processing circuitry is disposed within the sealed housing and a second section that includes detection circuitry extends from the sealed housing. The sensor assembly also includes a conductive target movably coupled to the second section of the printed circuit board to vary net voltage of the detection circuitry as the conductive target moves along the second section to provide an output signal. The processing circuitry detects the output signal and converts the output signal into a linear representation of position of the conductive target in relation to the second section.

A nebuliser cup for maintaining a safe level of liquid during nebulization, the cup comprising a liquid level sensor comprising: a first element sensing liquid at or below a position corresponding to a filled liquid level in the nebuliser cup; a second element electrically isolated from the first element and located at a position corresponding to a filled liquid level in the nebuliser cup; and wherein when the cup is not filled with a liquid to the filled liquid level, the first element, the liquid and the second element do not form an electrically coupled circuit; and when the cup is filled with a liquid to the filled to liquid level, the first element, the liquid and the second element together form an electrically coupled circuit.

Disclosed are devices and methods for determining a fluid level of and the amount of fluid remaining in a container. A portable measuring device can include a housing, a sensor, and a measurement system. The sensor can be supported by the housing and can detect a fluid level of the container. The measurement system can be configured to receive information including a measurement of the container, to determine an amount of fluid in the container based on a measurement of the container and a detected fluid level of the container, and to output the amount of fluid in the container and geometric information of the container. A method can include supplying such a device, placing the device proximal to or in abutment with and moving the device along an outer surface of the container, providing a signal to a user, and outputting the amount of fluid in a container.

A dielectric-constant-insensitive fluid level sensor for directly inserting into a high dielectric constant fluid is disclosed. According to one embodiment, the fluid level sensor includes a first set of stacked series capacitors where each capacitor in the first set is formed by two coplanar electrodes and a dielectric space between the electrodes. Each stack of series capacitors in the first set includes at least one capacitor having a first molded carrier as the dielectric space in series with another capacitor having a first fluid cavity as the dielectric space. In this embodiment, the total capacitance of the first set of stacked series capacitors varies as a function of the level of the fluid within the first fluid cavity.

A sensor includes a planar T-resonator and an oscillator. The planar T-resonator can be a branched T-resonator with at least two symmetrical branches coupled to a stub. The oscillator has an input coupled to the planar T-resonator and an output. The oscillator has a negative resistance within a predetermined frequency range. The oscillator can be configured so that it has an input phase approximately equal to a phase of the planar T-resonator over a majority of the predetermined frequency range.

Provided is a liquid level alarm device for a water filter including an alarm assembly and a liquid level detecting device. The liquid level detecting device is electrically connected to the alarm assembly and arranged in a water tank of the water filter. The alarm assembly is arranged on the water tank. The liquid level detecting device is configured to, in condition that a liquid level in the water tank rises to a preset height, send a liquid level warning signal to drive the alarm assembly to send an alarm signal. By arranging the liquid level detecting device in the water tank of the water filter, the liquid level in the water tank is detected by the liquid level detecting device. When the liquid level in the water tank of the water filter reaches the preset height, the liquid level detecting device sends a driving signal to drive the alarm assembly to send an audible and visual alarm signal. When seeing or hearing the audible and visual alarm signal, the user can know that the filter element of the water filter is blocked and fails to operate normally.

A sensor device for determining and/or monitoring a process variable of a medium in a container includes: a crystal body having at least one defect; and a magnetic field device for generating a magnetic field, the magnetic field device arranged such that a magnetic field can be generated in the region of the crystal body and in the region of the medium located within the container, so that a change of the magnetic field in the region of the crystal body is amplified, wherein the crystal body and the magnetic field device are arranged from the outside on a wall of the container. A method for determining and/or monitoring a process variable of a medium in a container using the sensor device is also disclosed.

An ostomy bag can include one or more sensors for measuring one or more metrics. An ostomy wafer can also include one or more sensors for measuring one or more metrics. The sensors can be temperature sensors and/or capacitive sensors, for example, and the metrics can include bag fill, leakage, skin irritation, and phase of stoma output, among others.

A fluid level sensing device includes a substrate (210) and a sensing die (216) cantilevered at one end from the substrate. A number of sensing components (218), preferably thermal or impedance sensing components, are disposed on the sensing die and detect a fluid level in a fluid reservoir. A protective member (208) is also cantilevered at one end from the substrate alongside the sensing die. Electrical interconnects (212) output data collected from the number of sensing components. A number of sensing dies may be provided to lengthen the sensing device, in which case the protective cover extends alongside and parallel to the number of sensing dies.