Abstract: The invention relates to a gas bubble sensing device (1) for sensing gas bubbles in a liquid. In order to provide a reliable detection of inadmissible gas bubbles at minimum cost and required installation space, the invention provides that the gas bubble sensing device (1) comprises two ultrasonic emitters (2, 3), which are both connected to one ultrasonic signal generator (10) in a signal transmitting manner. A gas bubble sensing device senses gas bubbles in a liquid. The gas bubble sensing device comprises two ultrasonic emitters, which are both connected to one ultrasonic signal generator in a signal transmitting manner. Further, the gas bubble sensing device comprises two control devices that are each connected to one of the signal processing devices in a signal transmitting manner, wherein one of the control devices comprises an output port, at which it provides a synchronization signal during operation.

Abstract: For flow measurement a device with a compact housing and a fixable hinged cover has a measuring channel for inserting a flexible tube such that it becomes deformed in a defined way. The measuring channel extends over the entire width of the housing. A measuring cell arranged in the center of the measuring channel has four ceramics I, II, III, IV, integrated in a sound-decoupled way and facing each other diagonally in pairs, which are placed in lateral parts on the left and on the right of the measuring cell, and a base plate limiting the measuring cell downwards in the direction of an installation space for an electric evaluation system, wherein the base plate also limits the remaining area of the measuring channel from below.

Abstract: The invention relates to a gas bubble sensing device (1) for sensing gas bubbles in a liquid. In order to provide a reliable detection of inadmissible gas bubbles at minimum cost and required installation space, the invention provides that the gas bubble sensing device (1) comprises two ultrasonic emitters (2, 3), which are both connected to one ultrasonic signal generator (10) in a signal transmitting manner.

Abstract: The invention relates to an ultrasonic transducer and to a gas bubble sensing device with two ultrasonic transducers. In order to be able to detect gas bubbles with different sizes reliably, at least one of the ultrasonic transducers comprises a plurality of segments that can be operated independent of each other.

Abstract: The invention relates to a method (30) of and an apparatus (1) for determining a flow rate of a fluid and detecting gas bubbles or particles in the fluid. In order to provide a method (30) and an apparatus (1), which can be used to perform more precise measurements and to provide a better safety, the invention provides that a collapse of an amplitude of an ultrasonic signal is used for detecting gas bubbles or particles.

Abstract: The invention relates to a device for the contactless flow measurement of fluids in flexible tubes.

Abstract: The present invention relates to a method and a device for monitoring a flowing medium, in particular the blood flowing in an extracorporeal blood circulation, for the presence of air, in particular micro-bubbles. A sequence of signal pulses or a continuous signal is injected into the flowing medium, and the signal pulses or continuous signal leaving the flowing medium are received. To detect micro-bubbles, a signal pattern that is characteristic of the variation over time of the received signal pulses or the continuous signal in a predetermined period of time is extracted from the signal received. The characteristic signal pattern is compared with one or more characteristic reference patterns, and the presence of air bubbles is determined if the characteristic signal pattern deviates from the characteristic reference pattern by a predetermined amount. Statistical characteristic variables, in particular the variance, are preferably determined from the signal patterns and compared with one another.

Abstract: The present invention relates to a method and a device for monitoring a flowing medium, in particular the blood flowing in an extracorporeal blood circulation, for the presence of air, in particular micro-bubbles. A sequence of signal pulses or a continuous signal is injected into the flowing medium, and the signal pulses or continuous signal leaving the flowing medium are received. To detect micro-bubbles, a signal pattern that is characteristic of the variation over time of the received signal pulses or the continuous signal in a predetermined period of time is extracted from the signal received. The characteristic signal pattern is compared with one or more characteristic reference patterns, and the presence of air bubbles is determined if the characteristic signal pattern deviates from the characteristic reference pattern by a predetermined amount. Statistical characteristic variables, in particular the variance, are preferably determined from the signal patterns and compared with one another.