A system is provided for monitoring foam levels within a vessel wherein one or more chemical reactions or biological growths are occurring. The system includes a resonant sensor positioned outside of the vessel at a position to measure foam level within the vessel, the resonant sensor having an inductive element and a capacitive element and tuned to provide for enhanced sensitivity of changes in local permittivity to resonate. In a frequency range which permits penetration through a sidewall of the vessel, at least one antenna positioned outside of the vessel, a scattering parameter measurement device electrically connected to the at least one antenna positioned outside of the vessel to measure transmitted or reflected power, and a controller operatively connected to the scattering parameter measurement device to receive a signal from the scattering parameter measurement device, the controller configured to correlate resonant frequency based on the signal from the vector network analyzer with foam level in the vessel,

An angle detection device, in particular for a fuel filling level detection device includes: a carrier; a cover, which has been connected to the carrier by at least one solder or adhesive connection layer; and a sensor for the contactless detection of an orientation of a magnetic field of a magnet. The sensor has been arranged in an interior space, which has been defined by the carrier and the cover, in particular on the carrier.

A horizontal automatic submersible pump includes a capacitive liquid level sensor, a circuit board and a motor. The capacitive liquid level sensor is arranged inside a casing of the horizontal automatic submersible pump. The capacitive liquid level sensor is configured to detect a liquid level outside the casing of the horizontal automatic submersible pump. The output terminal of the capacitive liquid level sensor is connected to the input terminal of the circuit board. The control terminal of the motor is connected to the output terminal of the circuit board. The circuit board is configured to control the motor to work or stop according to a detection signal of the capacitive liquid level sensor. The horizontal automatic submersible pump starts and stops automatically, and the capacitive liquid level sensor means there are fewer moving parts, which makes the pump less expensive to manufacture, more dependable and longer lasting.

A liquid level measurement sensor system includes an inner covering, an outer covering surrounding the outer periphery of the inner covering, a space defined between the inner and outer coverings, at least one outer capacitive sense element positioned in the space between the inner and outer coverings, and at least one inner referential capacitive sense element positioned within the inner covering. The outer capacitive sense element is configured to measure a liquid level. The inner referential capacitive sense element is configured to compensate for environmental changes. A method for measuring a liquid level in a tank includes taking a capacitance reading with an outer capacitive sense element, taking a referential capacitance reading with an inner referential capacitive sense element, comparing the capacitance reading with the referential capacitance reading to obtain a differential capacitance, and determining a liquid level with the differential capacitance.

An apparatus for filtering touches and disturbances of a container comprises a processing unit (PU) and computer-readable storage devices storing machine instructions. The PU obtains and sums together sensor values for a first sampling time from electrodes affixed to the container. The PU determines a difference between the sum for the first sampling time and a sum for a second sampling time, which is compared to a threshold representative of a change in capacitance due to a touch on the container. The PU determines whether the touch on the container has occurred at the first sampling time based on the comparison. If a touch occurred, the PU continues to obtain additional sensor values for additional sampling times and determine whether a touch on the container has occurred at the additional sampling times, until determining no touch occurred. The PU determines liquid level for the container after determining no touch occurred.

An automatic liquid density measurement device includes a receptacle configured to contain the liquid, a float configured to be submerged in the liquid when it is contained in the receptacle, and an electronic system. The electronic system includes a first electromagnetic sensor configured to make a reference measurement relative to the electrical properties of the liquid, a second electromagnetic sensor configured to make a measurement of the volume of the liquid displaced when the float is submerged in the liquid, and an electronic circuit coupled with said first and second electromagnetic sensors to determine the density of the liquid based on the measurement of the physical properties of the liquid and the measurement of the volume of the liquid displaced.

A wireless drink container can monitor a person's hydration and prompt him or her to drink more if appropriate. The drink containers as described herein can monitor liquid levels and communicate with external devices about the liquid levels and rate of consumption. One or more sensors in the drink container monitor the liquid level within the container. A processor coupled to the sensor(s) estimates how much liquid has been removed from the container from changes in the liquid level and transmits a signal representing the change in liquid level to a smartphone or other external device. It also triggers an audio or visual indicator, such as an LED, that prompts the user to drink more based on the user's estimated liquid consumption and on the user's liquid consumption goals, which may be based on the user's physiology, activity level, and location.

A fluid dispenser, such as a skincare product dispenser, comprises a dispenser housing configured to hold a reservoir of fluid for dispensing and a drive assembly for interacting with the reservoir and causing dispensing of the fluid. A fluid detection sensor is positioned within the dispenser housing proximate the reservoir and configured to detect a capacitance level therein. A controller is configured to determine, based on data from the fluid detection sensor, a change in the fluid level across a dispense. The controller is also configured to determine, based on the determined change, that the fluid level in the reservoir reaches a threshold level and cause an action, such as providing an alert, sending information to a remote server, or modifying an operating parameter.

A capacitor fuel probe comprises a plurality of capacitor segments which are superposed on one another along a probe axis. The capacitor segments are distributed into three sets and connected electrically in parallel within each set separately. A capacity measurement which is performed for all the sets allows determining a fuel level while taking into account a possible variation of a dielectric constant of the fuel parallel to the probe axis. Top height values h.sub.n of the capacitor segments are selected so that h.sub.n−1<h.sub.n.Math.(K.sub.min−1)/(K.sub.max−1), for any integer n-value from 2 to N, N being the number of capacitor segments, n varying according a superposition order of the capacitor segments, and K.sub.min and K.sub.max being minimum and maximum values for a fuel dielectric constant which are prescribed for the capacitor fuel probe.

A capacitive point source sensor for detecting presence of a liquid includes a main body having a sensor end and an outer end, the main body being configured to be coupled to and at least partially inserted through a container of the liquid. The sensor further includes two conductive contacts located on the sensor end of the main body. The sensor further includes an insulator enclosing the two conductive contacts.