Krohne Messtechnik Gmbh

Andreas Poremba

Kourosh Kolahi

Ralf Storm

Jürgen Lehmkuhl

A method for operating a resonant measurement system has at least one: adjustment device, electric actuation device, electromagnetic vibration generator, vibrating element, and vibration recorder. The adjustment device generates an output signal to trigger the electric actuation device, the electric actuation device provides an electric excitation signal to the electromagnetic drive, the electromagnetic drive excites the vibrating element to the same vibration in at least one normal mode, and the excited vibration is sensed by the vibration recorder and is output as an output signal. To approach, maintain and readjust a resonant point as an operating point of the resonant measurement system, the phase difference between the output signal of the vibration recorder and the adjustment device output signal is acquired, an adjustment deviation is calculated from a predefined phase difference and the acquired phase difference, and the adjustment deviation provided to the adjustment device as an input signal.

Method for operating a resonance-measuring system and respective resonance system

A method for operating a Coriolis mass flow measuring device having at least one measuring pipe through which a medium flows, at least one vibration generator, at least a first vibration sensor, at least a second vibration sensor and at least a control and analyzing unit. The detection of measurement variables or diagnosis parameters is achieved with increased accuracy and security in that the control and analyzing unit calculates, at least indirectly and in a ratiometric manner, at least a derived secondary variable based on a primary measurement, wherein interested primary measurement signals are transmitted alternately to the control and analyzing unit via different measurement channels and wherein, based on the various values obtained from the different measurement channels regarding the primary measurement signals, compensation values of the transmitted primary measurement signals are calculated and used as a basis for the calculation of the derived secondary variable.

Method for operating a resonance measuring system

Method for operating a resonant measurement system, especially a Coriolis mass flow meter, so as to be excitable in a linear operating range, the driving terminal current triggered by an electric excitation signal and the driving terminal voltage of the electromagnetic drive triggered by the electric excitation signal are measured. The driving power is determined from the driving terminal current and the driving terminal voltage, and if the driving terminal current exceeds a given maximum driving terminal current, and/or if the driving terminal voltage exceeds a given maximum driving terminal voltage and/or if the driving power exceeds a given maximum driving power, the electric excitation signal is limited to a threshold value such that the driving terminal current remains below the given maximum driving terminal current, and/or the driving terminal voltage remains below the given maximum driving terminal voltage, and/or the driving power remains below the maximum driving power.

Method for operating a resonant measurement system

A Coriolis mass flowmeter () having at least one sensor arrangement (), at least one transducer () and at least one housing (), wherein the sensor arrangement () has at least one measuring tube () that can be excited to oscillation, at least one oscillation generator () and at least one oscillation sensor (), wherein the transducer () at least in part has evaluation and power electronics for controlling and measurement evaluation of the sensor arrangement, wherein the sensor arrangement () and the transducer () are arranged adjacent to one another in a common volume defined by the housing (). A Coriolis mass flowmeter of the described type, in which the physical interaction between the sensor arrangement and transducer is reduced, is realized by the provision of a thermal barrier () arranged at least in a space between the sensor arrangement () and the transducer ().

Coriolis mass flowmeter with thermally, electrically, and magnetically isolated electronics

A power supply device for intrinsically safe power supply of an intrinsically safe load circuit includes a voltage source, a power-limiting circuit including at least two controllable semiconductor devices, a current-limiting circuit including at least one resistor, and a load circuit connector connected to the load circuit. The power-limiting circuit and the current-limiting circuit are active between the voltage source and the load circuit connector. The resistor includes a resistance value that suffices to limit a short circuit current to a current without danger of a spark ignition.

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Wuppertal, Germany

Andreas Poremba