Embodiments described herein generally relate to devices, systems and methods for measuring a volume or number of doses remaining in a drug delivery device that is used for delivering a dose to a patient. In some embodiments, a dose measurement system for measuring the liquid volume in a container includes a light guide disposed and configured to reflect electromagnetic radiation toward the container. The dose measurement system also includes a light guide disposed and configured to emit electromagnetic radiation into the light guide. A plurality of sensors are located in the apparatus that are optically coupleable to the light guide and are disposed and configured to detect the electromagnetic radiation emitted by at least a portion of the light guide. The apparatus also includes a processing unit configured to receive data representing the portion of the detected electromagnetic radiation from each of the plurality of sensors. The processing unit is further operable to convert the received data into a signature representative of the electromagnetic radiation detected by the plurality of sensors.

The present disclosure relates to an apparatus and method for liquid level detection. The method may include providing a circuit board including a plurality of horizontally mounted emitter/receiver pairs arranged vertically along the circuit board within a liquid containment area. The method may further include determining, using one or more processors associated with the circuit board, if liquid is present between each of the plurality of emitter/receiver pairs based upon, at least in part, data received from one or more of the plurality of emitter/receiver pairs.

An optical liquid level detection sensor includes a light source for emitting a light beam, a liquid contact surface, and a light detector, where the light source is arranged to emit a light beam towards the liquid contact surface, which liquid contact surface reflects or transmits the light beam in dependence of liquid being present on the liquid contact surface, where the light detector is arranged to receive the light beam after reflection on the liquid contact surface, where the sensor includes an at least partially transparent ring element, and where the liquid contact surface is formed by an outer surface of the ring element.

The present disclosure relates to an apparatus and method for liquid level detection. The method may include providing a circuit board including a plurality of horizontally mounted emitter/receiver pairs arranged vertically along the circuit board within a liquid containment area. The method may further include determining, using one or more processors associated with the circuit board, if liquid is present between each of the plurality of emitter/receiver pairs based upon, at least in part, data received from one or more of the plurality of emitter/receiver pairs.

The present disclosure relates to an apparatus and method for liquid level detection. The method may include providing a circuit board including a plurality of horizontally mounted emitter/receiver pairs arranged vertically along the circuit board within a liquid containment area. The method may further include determining, using one or more processors associated with the circuit board, if liquid is present between each of the plurality of emitter/receiver pairs based upon, at least in part, data received from one or more of the plurality of emitter/receiver pairs.

An optical sensor for a conventional tank gauge designed to allow a user to remotely check the liquid level of a tank without the need for a visual inspection. Using an emitter circuit board with a plurality of photoemitters and a detector circuit board with a plurality of photodetectors, the optical sensor can fit over a conventional tank gauge without disturbing the gauge. The circuit boards can be attached to an optical sensor frame, which can be adjusted on the conventional tank gauge by a height adjustment screw and a series of set screws. Alternatively, one or more sliders can be used to maintain proper alignment. Analog data generated from the photodetectors can be digitized using a microcontroller and can be made available for viewing on a stationary or mobile device via an integrated network connection.

A sensor assembly includes a housing including a cavity allowing a liquid to flow thereinto, a liquid level sensing module installed on the housing and configured to sense information related to a liquid level when the liquid is flowing into the cavity, and a turbidity sensing module installed on the housing. The turbidity sensing module includes a light emitting unit and a light receiving unit. The light emitting unit and the light receiving unit are located oppositely on an outer surface of the housing to allow a light emitted from the light emitting unit to pass through the cavity of the housing and be received by the light receiving unit.

In one aspect the present disclosure relates to a sensor for measuring at least one physical or chemical parameter of a cartridge or syringe filled with a liquid substance. In further aspects the disclosure relates to a cartridge equipped with such a sensor as well as to a drug delivery device equipped with such a cartridge, wherein the sensor comprises: a planar flexible foil arrangeable to an outer circumference of a barrel of the cartridge or syringe, at least a first and a second measuring electrode arranged on said foil, and at least a first and a second contact electrode arranged on said foil, wherein the first contact electrode is connected to the first measuring electrode and wherein the second contact electrode is connected to the second measuring electrode.

A remote sensing system and device is provided for monitoring a condition within an infrastructure network. In particular, the system and device are configured to monitor components of civil water infrastructure such as sewers, rainwater infrastructure, freshwater infrastructure, manholes, catch pits, sewers, or outlets etc. The device includes an antenna unit having an elongate hollow shaft depending therefrom, and a monitoring unit for housing electrical components including a sensor for detecting a parameter. The monitoring unit is removably mounted to the antenna unit via the shaft, and connected to a component of the infrastructure being monitored, for example manhole cover or lid. The antenna unit and monitoring unit are separate and individually water-tight structures, and the elongate hollow connection shaft makes an essentially rigid connection, while finding a passageway between antenna unit and monitoring unit.

A sensor apparatus for determining and/or monitoring a process variable of a medium in a containment includes: a crystal body including at least one defect; a magnetic field system for producing a magnetic field in the region of the crystal body and in the region of the medium within the containment, wherein the crystal body and the magnetic field system are arrangeable from the outside at a wall of the containment; a detection unit for detecting a magnetic field-dependent, fluorescent signal from the crystal body, wherein the detection unit has an excitation unit for optical exciting of the defect and a detector for detecting the fluorescent signal; and an evaluation unit for ascertaining at least one piece of information concerning the process variable based on the fluorescent signal.