Abstract: An ultrasonic transducer for an ultrasonic flowmeter includes: a transducer housing with an ultrasound window; a transducer element in the transducer housing that transmits ultrasonic signals onto a signal path and receives ultrasonic signals from the signal path; a control and evaluation unit that controls the transducer element and evaluates the ultrasonic signals; and a buffer element that forms at least one at least partially reflective boundary layer in the signal path. In an operating state, the transducer element transmits an ultrasonic signal that is at least partially reflected at the boundary layer of the buffer element, and the reflected signal component is received by the transducer element. The control and evaluation unit monitors the reception of the reflected signal component and, in the absence of reception of a reflected signal component, detects an error state of the ultrasonic transducer.

Abstract: An ultrasonic transducer for an ultrasonic flowmeter includes: a transducer housing with an ultrasound window; a transducer element in the transducer housing that transmits ultrasonic signals onto a signal path and receives ultrasonic signals from the signal path; a control and evaluation unit that controls the transducer element and evaluates the ultrasonic signals; and a buffer element that forms at least one at least partially reflective boundary layer in the signal path. In an operating state, the transducer element transmits an ultrasonic signal that is at least partially reflected at the boundary layer of the buffer element, and the reflected signal component is received by the transducer element. The control and evaluation unit monitors the reception of the reflected signal component and, in the absence of reception of a reflected signal component, detects an error state of the ultrasonic transducer.

Abstract: A tomography device for electric impedance tomography in a measuring volume having at least two measuring ports. The object is to provide a tomography device that allows adaptation to an application with less effort and/or a greater number of measuring ports than the prior art. The object is achieved with a tomography device in that the tomography device has at least two measuring modules, that each of the measuring modules is designed to be controllable via the respective module radio device and module control device and, in each case has a module control device, a module radio device and one of the measuring ports, and the respective measuring port can be arranged at a freely selectable position on a perimeter of the measuring volume, and that each of the module control devices is designed to carry out measurements for electrical impedance tomography using the respective measuring port.

Abstract: A tomography device for electric impedance tomography in a measuring volume having at least two measuring ports. The object is to provide a tomography device that allows adaptation to an application with less effort and/or a greater number of measuring ports than the prior art. The object is achieved with a tomography device in that the tomography device has at least two measuring modules, that each of the measuring modules is designed to be controllable via the respective module radio device and module control device and, in each case has a module control device, a module radio device and one of the measuring ports, and the respective measuring port can be arranged at a freely selectable position on a perimeter of the measuring volume, and that each of the module control devices is designed to carry out measurements for electrical impedance tomography using the respective measuring port.