Abstract: A sensor device (1) detects flowable media (3, 3?), in particular fluids (9) received in pressure devices (5), such as pressure containers (7) or pressure lines. A sensor element (11) has an oscillation device (13) that is excited to produce oscillations under the action of a field (15) of a field generation device (17). The oscillating behavior of the oscillations changes upon inflow of the respective medium (3). The changes can be detected by a measuring device (19).

Abstract: A media separating device (1), in particular a hydraulic accumulator (3), has a movable separator (5) separating two media (7, 9) received in media chambers (11, 13) and differing from each other. A measuring apparatus (15, 115) can detect an overflow of at least one medium (7, 9) from a medium chamber (11, 13) via the separator (5) into the other medium chamber (11, 13) having the other medium (9, 7).

Abstract: The invention relates to a media separating device (1), in particular a hydraulic accumulator (3), having a movable separating means (5) for separating two media (7, 9) which are received in media chambers (11, 13) differing from each other, wherein said media separating device is characterized in that, by means of a measuring apparatus (15, 115), it is possible to detect an overflow of at least one medium (7, 9) from a medium chamber (11, 13) via the separating means (5) into the other medium chamber (11, 13) having the other medium (9, 7).

Abstract: Sensor device (1) for detecting flowable media (3, 3?), and pressure device (5) and measuring method for operating the sensor device (1). A sensor device (1) for detecting flowable media (3, 3?), in particular in the form of fluids (9) which can be received in pressure devices (5), such as pressure containers (7) or pressure lines, with at least one sensor element (11) is characterized in that the respective sensor element (11) has an oscillation device (13) which is excited to produce oscillations under the action of a field (15) of a field generation device (17), the oscillating behaviour of which oscillations changes upon inflow of the respective medium (3), and in that the change can be detected by a measuring device (19).