Abstract: According to an example aspect of the present invention, there is provided a coupling element for indicating a process position of at least one radio frequency identification, RFID, tag, the coupling element comprising: a housing comprising an inside; a shield plate forming a top surface of housing and comprising at least one sensing aperture; for the coupling element configured to generate an electromagnetic field arranged to couple with the at least one RFID tag, and at least one light arranged inside of the housing and configured to illuminate the inside of the housing; wherein the coupling element is configured to process the at least one RFID tag within the sensing aperture such that the at least one RFID tag is coupled to the coupling element via the electromagnetic field, and the at least one light is controlled based on timing of a process of the at least one RFID tag.

Abstract: A method and an arrangement for identifying liquid levels, in which method a capacitor is arranged into liquid in a container, between plates of which capacitor, liquid will enter in such a manner that the liquid-filled portion of the space between the plates changes with liquid levels and determines the capacitance of the capacitor. In the invention, a signal obtained from the capacitor is employed, the signal being dependent on the liquid level in the container. A coil is connected to the capacitor forming an electrical circuit with the capacitor, whereby the liquid level, while determining the capacitance of the capacitor, at the same time determines the resonance frequency of the electrical circuit. The resonance frequency is measured from outside the container inductively without a lead-through to the container.

Abstract: An apparatus and method for identifying containers (1) containing different anesthetic fluids. A connecting element (8) is used for coupling the container with a conduit (6) extending to a patient for supplying an anesthetic to a patient. The containers containing anesthetic fluids are designated or labeled distinctly from each other by means of at least one magnetic-field producing element (12). The presence of this element is in turn detected by means of a magnetic-field detecting element (13). The identification of a container containing an anesthetic fluid and, thus, an anesthetic fluid contained therein is effected by means of an identification element (15), which receives a signal from one or more magnetic-field detecting elements. The detection can also be used as a basis for establishing whether the container is coupled in its position.