Disclosed herein are a device and method designed for determining the liquid level in a container through measuring the pressure in the liquid by a pressure sensor located at the bottom of the container within a chamber designed to prevent solid particles dispersed in the liquid from reaching the sensor. Measuring the pressure of the liquid in the container can be based on an upper chamber located above a lower chamber, both adjacent chambers are located within a container. The upper chamber comprises tiny slots allowing the liquid in the container to enter the upper chamber and exert a weight on a diaphragm gasket functioning as a common-wall of the two adjacent chambers. The diaphragm gasket exerts pressure resulting from the liquid weight, on the lower chamber containing the pressure sensor designed to measure the pressure exerted on the lower chamber. In some embodiments, the device and method disclosed herein are used for measuring changes in the pressure at the bottom of the container, wherein the pressure changes are indicative of changes in the liquid level. In some embodiments, the measured pressure can be one or more pressure values measured in a continuously fashion by a one or more pressure sensors.

Liquid-gauging systems for estimating amounts of liquid within collapsible bladders. In some embodiments, a liquid-gauging system of this disclosure includes one or more liquid-gauging sensors that each output a signal relating to an amount of liquid within a corresponding collapsible bladder. In some embodiments, each liquid-gauging sensor comprises a variable capacitor having capacitor plates located so that the spacing between the capacitor plates changes with changing amounts of liquid within the collapsible bladder. In some embodiments, each liquid-gauging sensor comprises a pressure sensor for measuring forces, such as gravitational forces, that change with changing amounts of liquid within the collapsible bladder. In some embodiments, a liquid-gauging system is configured for an aircraft or other moving vehicle and includes one or more additional sensors to adjust the estimating process to account for changes in attitude of the vehicle during use. Corresponding methods, liquid-storage systems, and collapsible bladders are also disclosed.

A system includes a computer having a processor and a memory storing instructions executable by the processor to determine a first temperature of a fluid stored by a fluid storage device and then actuate a fluid heating device to add heat energy to the fluid. The instructions include instructions to determine an amount of the heat energy added to the fluid. The instructions include instructions to determine a second temperature of the fluid stored by the fluid storage device after adding the heat energy to the fluid. The instructions include instructions to determine a quantity of the fluid stored by the fluid storage device based on the amount of the heat energy added to the fluid by the fluid heating device and a difference between the first temperature and the second temperature.

A pesticide volume meter for a pesticide spray system comprises a flow sensor, which measures a flow rate of a pesticide dispensed by the pesticide spray system. The pesticide volume meter also comprises a memory and a control unit. The control unit determines a volume of pesticide dispensed by the pesticide spray system based on the measured flow rate, and stores the determined volume in the memory.

A bin volume predictor can receive data characterizing measurements of a temperature at a plurality of temperature sensors of a temperature sensor cable that is positioned to extend along a height of the storage bin in an interior of the storage bin and data characterizing measurements of an ambient temperature of an exterior of the storage bin. The bin volume predictor identifies, based on the measured temperature for temperature sensors in the interior of the storage bin, a topmost covered temperature sensor of the temperature sensor cable. Moreover, the bin volume predictor determines, based on the identified topmost covered temperature sensor, an amount of material stored in the storage bin.

A radar level gauge system controllable between a measurement state and a signal processing state. In the measurement state a first timing signal circuit is enabled, a microwave signal source generates a transmit signal with a time-varying frequency being related to first timing signals from the first timing signal generating circuitry, and a sampler samples a mixer signal at sampling times related to the first timing signals. in the signal processing state, the first timing signal circuit is disabled, and a signal processor determines the filling level based on the sampled values of the mixer signal using second timing signals from a second timing signal generating circuit.

A float assembly of a fluid-level sensor includes a float and an arm assembly. The arm assembly has a first attachment portion connectable to a fluid-level sensor and a second attachment portion connected to the float. The arm assembly further has an articulating joint that permits relative movement between the float and the first attachment portion. A sensor attached to the float.

An improved fluid level sensor includes a radially magnetized magnet integrated into a float, and a Hall sensor adapted to monitor the magnet field emitted from the magnet. This arrangement provides a continuously variable signal across a range of travel, such that a controller receiving the signal can produce precise fluid level measurements and detect operational states of an associated device based on fluid behavior. In addition, the present fluid level sensor is suitable for use in harsh service environments, both because it is physically resilient to fouling, and because the controller is capable of detecting fouling by sensor behavior. In the context of a steam cooker, the present fluid level sensor can also sense low-water, overfill and fouling conditions, while remaining relatively insensitive to food residue, water scale buildup, corrosion and foaming.

In some examples, a processor on a vehicle may determine, based at least partially on information obtained from a sensor, that a fuel level of the vehicle is increasing. Further, the processor may determine that the fuel level has stabilized for a threshold time. In addition, the processor may determine an amount of fuel added to the vehicle, and may send, over a wireless network to a computing device, a communication indicating the amount of fuel added. In some cases, the computing device may compare the amount of fuel indicated in the communication from the processor with an amount of fuel indicated in information received from a point-of-sale device for determining a difference.

A water gauge for on-site monitoring and early warning includes an alarm part, a control part and a retractable part. The retractable part is fixedly connected with the alarm part at the top, and the control part at the bottom; the alarm part is electrically connected with the control part through a wire; the control part compares the water level measured by the retractable part with a preset threshold, to determine whether the alarm part needs to give an alarm. When the water on the road rises to the warning line of 30 cm set on the water gauge during a rainstorm, the warning light on the top of the water gauge will start to flash, and the water gauge will give an alarm through the speaker, reminding the pedestrians and vehicles not to pass the section for the time being.