Abstract: An assembly for determining a type of a fluid, the assembly configured to be mounted to a tank containing the fluid, comprises an ultrasound sending/receiving subassembly and a processor module. The ultrasound sending/receiving subassembly is configured to send a plurality of ultrasound signals into the fluid and receive the ultrasound signals reflected from the fluid. An ultrasound signal of the plurality of ultrasound signals has at least a first frequency and a second frequency different from the first frequency. The processor module is adapted to determine an attenuation of the ultrasound signal at the first frequency and at the second frequency.

Abstract: A system for detecting the presence of bubbles in a solution includes an ultrasonic receiver, receiving a pair of signals having different frequencies after passage through the solution, and a computing unit. The computing unit computes a signal value for each of the signals, the signal value representing a defined signal property, compares the signal values for the signals with each other and/or each with a predefined reference value, and computes a deviation of the signal values from each other and/or between the signal values and the predefined reference value. The computing unit generates a bubble confirmation signal that confirms the presence of bubbles in the solution if the deviation is greater than a predefined threshold value.

Abstract: A method for detecting a property of a liquid medium comprises generating an ultrasonic pulse, receiving a first echo and a second echo of the ultrasonic pulse transmitted through the liquid medium, and generating a first amplitude signal for the first echo and a second amplitude signal for the second echo. The method includes calculating an amplitude signal ratio between the first amplitude signal and the second amplitude signal and determining a property signal representing the property of the liquid medium.

Abstract: A method for detecting an open circuit state failure in a piezoelectric element connection includes exciting a piezoelectric element with an excitation signal and monitoring and evaluating an electrical output signal generated by the piezoelectric element in response to the excitation signal. The excitation signal is a pulse train. A frequency of the pulse train is chosen such that the piezoelectric element acts as a low pass filter.

Abstract: A method for detecting an open circuit state failure in a piezoelectric element connection includes exciting a piezoelectric element with an excitation signal and monitoring and evaluating an electrical output signal generated by the piezoelectric element in response to the excitation signal. The excitation signal is a pulse train. A frequency of the pulse train is chosen such that the piezoelectric element acts as a low pass filter.

Abstract: A method for detecting a property of a liquid medium comprises generating an ultrasonic pulse, receiving a first echo and a second echo of the ultrasonic pulse transmitted through the liquid medium, and generating a first amplitude signal for the first echo and a second amplitude signal for the second echo. The method includes calculating an amplitude signal ratio between the first amplitude signal and the second amplitude signal and determining a property signal representing the property of the liquid medium.

Abstract: A system for detecting the presence of bubbles in a solution includes an ultrasonic receiver, receiving a pair of signals having different frequencies after passage through the solution, and a computing unit. The computing unit computes a signal value for each of the signals, the signal value representing a defined signal property, compares the signal values for the signals with each other and/or each with a predefined reference value, and computes a deviation of the signal values from each other and/or between the signal values and the predefined reference value. The computing unit generates a bubble confirmation signal that confirms the presence of bubbles in the solution if the deviation is greater than a predefined threshold value.

Abstract: An assembly for determining a type of a fluid, the assembly configured to be mounted to a tank containing the fluid, comprises an ultrasound sending/receiving subassembly and a processor module. The ultrasound sending/receiving subassembly is configured to send a plurality of ultrasound signals into the fluid and receive the ultrasound signals reflected from the fluid. An ultrasound signal of the plurality of ultrasound signals has at least a first frequency and a second frequency different from the first frequency. The processor module is adapted to determine an attenuation of the ultrasound signal at the first frequency and at the second frequency.