Diehl Metering Gmbh

Alexander Hofmann

Marcus Wetzel

Andreas Madinger

Michael Mayle

Ulrich Gaugler

Frederik Neder

Florian Herrmann

Markus Schmidt

A method operates a measuring device used to determine a fluid variable. The measuring devices contains a vibration transducer driven to excite a wave in the fluid due to a test excitation signal. The wave is guided along a propagation path back to the vibration transducer or to an additional vibration transducer, thereby exciting the (additional) vibration transducer to vibrate. An output signal relating to this vibration is acquired, and a frequency of that segment of the output signal that lies in an analysis interval is determined. The analysis interval starts once the driving of the vibration transducer to excite the wave has finished, and/or once a maximum of the amplitude of the vibration is reached. The determination of the fluid variable is performed based on the determined frequency. An error message or a notification is output to a user and/or to a device external to the measuring device.

Method for operating a measuring device used to determine a fluid variable, and measuring device

An ultrasound flow measurement device has a vessel through which a fluid to be measured flows. An ultrasound measurement configuration with an ultrasound transducer is provided for measuring a propagation time of an ultrasound signal containing a plurality of periods along a measurement section that runs partly in a direction of flow. A controller determines a fluid flow on a basis of a propagation time measurement. The controller contains a memory, a first evaluator for determining a period duration of at least one of the periods of an ultrasound signal received after passing through the measurement section, a second evaluator for determining a spread value of a predetermined number of last received ultrasound signals, a comparator for comparing the spread value with a threshold value, and an actioning device for initiating a control action, assigned to the threshold value that has been exceeded, for the ultrasound flow measurement device.

Ultrasound flow measurement device with signal quality monitoring

A flow measuring device detecting a fluid volume quantity since a start of a measurement includes a processing device determining a current flow rate parameter at measurement times using measurement data of a sensor, to increase a volume quantity based on a current flow rate parameter when operating in a first operating mode, and to keep the volume quantity constant when operating in a second mode. The processing device stores the current flow rate parameter for each measurement time in a data memory, resulting after several measuring times in storing previous flow rate parameters determined at these measuring times. Upon satisfying a switchover condition, depending on the current flow rate parameter, during operation in the second mode, the processing unit switches over to the first mode, and the volume quantity increases as a function of the current flow rate parameter and a predefined number of previous flow rate parameters.

Flow measuring device for detecting a volume quantity relating to a fluid volume flowed through a measuring volume since a start of a measurement

A measuring device has at least one ultrasonic transducer and an evaluator for evaluating a measurement signal provided by the at least one ultrasonic transducer. The evaluator is set up to determine a first comparison signal, by comparing the measurement signal with a first switching threshold, and a second comparison signal, by comparing the measurement signal with a second switching threshold which is different from the first switching threshold, and to determine a signal amplitude of the measurement signal depending on the first and second comparison signal.

Measuring device, in particular a flow meter, with at least one ultrasonic transducer

A method for evaluating discrete measurement data sequences of an ultrasonic flow measuring device having a recording frequency and ultrasound signal, includes determining time position or height of a maximum of a sinusoidal profile of a time sequence of evaluation values, determined as part of a measurement data sequence or cross-correlation of two sequences recorded at different positions of the device by determining a maximum evaluation value of the time sequence and evaluation values thereof adjacent thereto. Initial values, including an initial maximum value and time, are determined by quadratic fit of evaluation values. Output values including output time describing the position or output height describing the height of the maximum are determined by a determination relationship setting output values in relation with initial values and a calculation quantity formed from selected evaluation values for known recording frequency and known signal frequency and based on a known sinusoidal profile.

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Sachsen, Germany

Alexander Hofmann