A pump controller has a signal processor that receives signaling about an instant water level AI.sub.L of a liquid in a container and generated by a water level transducer during an empty/fill application; and determines corresponding signaling to control a pump during the empty/fill application based upon the signaling received using a liquid level control algorithm that turns ON the pump when the instant water level AI.sub.L rises above a maximum empty water level during an empty application, or falls below a maximum fill water level during a fill application; turns OFF the pump when the instant water level AI.sub.L falls below a minimum empty water level for the empty application, or rises above a second maximum fill water level during the fill application; controls the pump when the instant water level AI.sub.L is in a liquid level region above the minimum empty water level and below a second maximum empty water level for the empty application, or falls below the second maximum fill water level and above a second minimum fill water level during the fill application based upon a respective desired adaptive pressure set point SP* being defined from a respective adaptive liquid level control curve with respect to the instant water level AI.sub.L.

A liquid level monitoring system for monitoring the level of liquid in a tiltable tank, which may tilt or rotate in a tilt or rotation plane about a tilt axis. The system comprises a pair of pressure sensors comprising a first pressure sensor for sensing the pressure of the liquid in the tank at a first position located towards the bottom of a tank and a second pressure sensor for sensing the pressure of the liquid in the tank at a second position located a known pre-defined distance above the first sensing wherein the two sensing positions are located on a sensing line substantially orthogonal to and passing through a liquid surface dividing line, said liquid surface dividing line being the line along and extending past the surface of liquid in the tank whose position relative to the tank walls remains the same as the tank tilts about the tilt axis.

The invention relates to a sensor (1) for determining a liquid level (NE) for an aircraft tank (100), the determining sensor (1) comprising a closure device (2) for closing a port (101) of the tank (100) and a measuring device (3), removably mounted on the closure device (2), comprising a liquid line (20) configured to convey liquid from the port (100) of the tank (100), and a member (21) for automatically sealing the liquid line (20) if the measuring device (3) is not mounted on the closure device (2), the measuring device (3) comprising at least one pressure measuring member (30) configured to measure a pressure difference between the liquid pressure (P1) in the liquid line (20) and a reference pressure (P2) in order to deduce the liquid level (NE) thereof.

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 fill level switch arrangement (1) for determining the fill level of a medium (2) in a container (3) and a method for determining the fill level of a medium (2) in a container (3) using a fill level switch arrangement (1). The fill level switch arrangement (1) has at least one alarm threshold that can be implemented in a simplified manner due to the fill level switch arrangement (1) having a transmitting element (4) and a receiving element (5), wherein the transmitting element (4) is used for transmitting a radio signal and is operatively connected to the receiving element (4), wherein the receiving element (5) is configured to detect radio signals, and wherein the receiving element (5) is configured such that it generates and transmits a switching signal in the event of a change in the received radio signal caused by the medium (2).

Apparatus and method for determining: proper operation of a cleaning system, the depth of liquid in a drum, the predicted failure of a pump, improving the ability to monitor cleaning system, improving the ability to monitor dairy wash systems, improving the ability to monitor animal husbandry systems, and/or increasing the efficiency with which various types of equipment, fluid levels, and/or systems can be serviced or monitored.

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.

A blocked sewer unit includes a substantially impermeable barrier having a first side exposed to the interior of a sewage network and a second side, the barrier movable in the direction of the second side in response to fluid pressure on the first side. The blocked sewer alert unit includes a transducer separated by the barrier from the sewage network, the transducer configured to generate an electrical signal when the barrier moves into the dry section. The blocked sewer alert unit includes an alarm circuit configured to convert the electrical signal into a user alert.

An assembly includes at least one container, an injection medium supply, at least one flow line extending from the injection medium supply to an interior portion of the at least one container; and a pressure transducer coupled to each of the at least one flow line.

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.