An inkjet printhead device, fluid ejection device and method thereof are disclosed. The fluid ejection device includes a fluid supply chamber to store fluid, an ejection chamber including a nozzle and a corresponding ejection member to selectively eject the fluid through the nozzle, and a channel to establish fluid communication between the fluid supply chamber and the ejection chamber. The fluid ejection device also includes a pressure sensor unit having a sensor plate to output a voltage value corresponding to a cross-sectional area of an amount of fluid in the at least ejection chamber.

An automatic swimming pool cleaner (APC) for swimming pools and spas may be used to monitor and/or determine a waterline level of the swimming pool or spa. Optionally, the determined waterline level may be provided on a user interface of an external device such as but not limited to a control box or a user device. An alert may be provided to a pool owner or other user based on the waterline level relative to a threshold waterline level. Optionally, at least one piece of equipment associated with the swimming pool or spa may be controlled based on the determined waterline level.

The present application discloses a method for measuring pressurized liquid fuel level in a fuel tank used on a vehicle comprising measuring the pressure of the fuel to generate a pressure signal and measuring the temperature of the fuel to generate a temperature signal. A fuel level signal is determined from the pressure signal and the temperature signal and changes in the fuel level signal are determined over time. A first point of the fuel level signal indicating approaching emptying of the tank is identified when changes in the fuel level signal exceed a given value and the approaching emptying of the tank is signaled to an operator of the vehicle in response to identifying the first point. Also disclosed is a fuel level meter system comprising a display comprising a series of at least three light sources arranged in a generally vertical column with a bottommost one of the at least three light sources being of a first color and light sources above the bottommost one of the at least three light sources being of a second color.

A tank overflow protection system and method for measuring process temperature and pressure utilizing one or more piezoresistive pressure transmitters. The piezoresistive pressure transmitter includes a differential pressure sensor and a temperature sensor. Data from the piezoresistive pressure transmitters can be digitally communicated via a cable. The pressure transmitters convert signals indicative of temperature and pressure to a digital value and transmit the signals to a main processor printed wire assembly for final compensation, diagnostics, and transmission to a distributed control system. A differential pressure can be calculated by subtracting two digital pressure measurement values. The temperature measurement can be employed to calculate any changes in density for a user-defined reference value.

Systems and methods of the present disclosure include a vehicle water detection system that includes a housing configured to be disposed within a vehicle. The vehicle water detection system also includes a water-activated battery disposed within the housing and configured to produce an electrical voltage upon contact with water. The vehicle water detection system further includes an electronic circuitry disposed within the housing and configured to detect a water event occurring in the vehicle based at least in part on the electrical voltage.

A self-sustaining sensor is provided, being configured to detect a fill level, a limit level, or a pressure of a medium or to measure an interface of a mixture of media in a transport container, the sensor including: a closed housing configured to be submerged in the medium; and a sensor element arrangement including one or more sensor elements arranged in or on the housing, in which the sensor is configured to rest on a bottom of the container and/or to float on a separating layer of the mixture of media during measurement, without being fixed to the container. A self-sustaining fill level measurement system, limit level measurement system, or pressure measurement system is also provided. A method for detecting a fill level or a limit level or a pressure of a medium or for interface measurement of a mixture of media in a transport container is also provided.

A consumable level monitoring label apparatus, system and method for physical association with a content-filled consumable to allow for monitoring of a level of the content therein. The apparatus, system and method includes a plurality of labels, each individually manually removable from the label sheet and each comprising: a plurality of electrical conductors forming a sensing module, the sensing module having associated therewith firmware for converting signals associated with the electrical conductors and to an indication of the content level; a communications module for communicating the content level to at least a user display and over at least one network; and a power module for powering at least the sensing module and the communications module. A plurality of perforations are associated with each of the plurality of labels, wherein the plurality of perforations provides for variations in a size of each of the labels upon the manual removal.

A consumable level monitoring label apparatus, system and method for physical association with a content-filled consumable to allow for monitoring of a level of the content therein. The apparatus, system and method includes a plurality of labels, each individually manually removable from the label sheet and each comprising: a plurality of electrical conductors forming a sensing module, the sensing module having associated therewith firmware for converting signals associated with the electrical conductors and to an indication of the content level; a communications module for communicating the content level to at least a user display and over at least one network; and a power module for powering at least the sensing module and the communications module. A plurality of perforations are associated with each of the plurality of labels, wherein the plurality of perforations provides for variations in a size of each of the labels upon the manual removal.

Apparatuses and methods for compressed fluid vessel monitoring can permit a user to more easily order replacement vessels, monitor use, monitor inventory and return empty vessels. Embodiments can utilize a collar connectable to a vessel to help facilitate such functionality. The collar can be adapted to transmit signals to a data processing system. The data processing system can be adapted to permit a user to track the location and fill status of the vessel as well as order a replacement vessel and disposal or return of an empty vessel. Instrumented vessels can also convey sensor data to help identify a leak condition or other condition of the vessel. In some embodiments, the data processing system can be adapted for integration into a user's inventory system and/or purchasing system as well as a supplier's system to facilitate communications concerning vessel fill status, reorder, and/or vessel return.

Liquid level detectors may include a pump for drawing liquid from a reservoir, a channel fluidically coupling the pump to the reservoir, and a J-tube connected to an end of the channel within the reservoir. The J-tube may include a first tube section and a second tube section extending along the first tube section. Perforations may extend between the first tube section and the second tube section. A pressure sensor may be positioned and configured to sense a pressure of liquid drawn from the reservoir through the J-tube and the channel and to sense pressure drops when a liquid level in the reservoir passes the respective perforations. Various other related systems and methods are also disclosed.