Method and system for detecting a cleaning process in a radar level gauge configured to determine a fill level of a product contained in a tank, the radar level gauge comprising a transceiver configured to provide a transmit signal, S.sub.T, to be propagated towards the product by a propagating device, to receive a reflected signal, S.sub.R, resulting from a reflection of the transmit signal at a surface of the product, and to determine a fill level in the tank based on the received reflected signal, wherein the method comprises: at a measurement position above the fill level and a known distance from a reference position near a ceiling of the tank, determining (300) a difference in signal amplitude between at least two different fill level measurements; and if the determined difference in signal amplitude exceeds a predetermined threshold value, determining (302) that a cleaning process is ongoing in the tank.

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.

Methods for determining variability in a state of a medium, include monitoring the medium and determining the variability in the state of the medium based on the processing of the response over time based on the response detected at the at least one receive element over time. Monitoring the medium can include generating a transmit signal, transmitting it into the medium using a transmit element, and receiving a signal from the medium at a receive element. The transmit and receive elements can be decoupled from one another. The transmit and receive elements can have differing geometry. The determined variability in the state of the medium can be used to provide notifications and/or take automated actions.

To provide a flood detection technique with which a breakdown is less likely to occur over a long period, maintenance costs are low, and the occurrence of an abnormal water level is less likely to be erroneously determined. An inundation detection device 1 detects a received signal strength I(t) that is the strength of a received response signal received from an RF sensor installed at a flood detection location, detects a dispersion D(I;[t−Δt.sub.1, t]), within a specific time Δt.sub.1, of I(t), detects a normal reception rate R[(t−Δt.sub.2, t]), and outputs a flood detection signal in a case where the dispersion D(I;[t−Δt.sub.1, t]) is greater than or equal to a specific threshold D.sub.th1 and the normal reception rate R[(t−Δt.sub.2, t]) is less than or equal to a specific threshold R.sub.th1. When an increase in the dispersion D(I;[t−Δt.sub.1, t]) and a decrease in the normal reception rate R[(t−Δt.sub.2, t]) are appropriately determined on the basis of the thresholds, the RF sensor that is flooded can be detected with high accuracy.

A method for maintaining a boiling rate of a base fluid can include a determination of a fluid level of a turbulated base fluid in a reservoir. The fluid level can be determined by measuring at least one first height of the turbulated base fluid above the fluid level with at least a first sensor. The fluid level can be determined by measuring at least one second height of the turbulated base fluid below the fluid level with the first sensor. The method can include the establishment of the fluid level of the turbulated base fluid. The fluid level can be established according to the measured at least one first and second heights. The method can include the graduated introduction of an input fluid into the reservoir. A control valve can gradually introduce the input fluid in proportion to the established fluid level of the turbulated base fluid.

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 fill level sensor for detecting a level of a fill medium in a container includes a generator having a feed line, an antenna, a supply and a controller. The generator generates electromagnetic waves having a resonant frequency and outputs the electromagnetic waves via the feed line having a line impedance with a line impedance value. The supply is arranged between the feed line and the antenna and transmits the electromagnetic waves from the feed line to the antenna. The supply has a resonant circuit. The resonant circuit and the antenna together have a resonant input impedance in the transmission direction. The resonant circuit transforms the resonant input impedance at the resonant frequency into a real impedance having a predetermined resonant impedance value. The antenna has an antenna resonant frequency different from the resonant frequency.

A tank volume measurement system and method. The tank volume measurement system receives a tank identifier indicating which tank the level sensor is sensing, receives a tank level indication from a level sensor, correlates the tank level to a tank volume using a calibrated strapping chart, and outputs a volume indication to a user.

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 method for maintaining a boiling rate of a base fluid can include a determination of a fluid level of a turbulated base fluid in a reservoir. The fluid level can be determined by measuring at least one first height of the turbulated base fluid above the fluid level with at least a first sensor. The fluid level can be determined by measuring at least one second height of the turbulated base fluid below the fluid level with the first sensor. The method can include the establishment of the fluid level of the turbulated base fluid. The fluid level can be established according to the measured at least one first and second heights. The method can include the graduated introduction of an input fluid into the reservoir. A control valve can gradually introduce the input fluid in proportion to the established fluid level of the turbulated base fluid.