Measuring system for ascertaining a volume flow and/or a volume flow rate of a medium flowing in a pipeline

摘要

The measuring system comprises: a vibration element for guiding flowing medium and having a lumen; and a vibration element, which is adapted to be contacted, at least at times, by a part of the medium. Additionally, the measuring system includes at least two oscillation exciters for exciting resonant oscillations of the respective vibration elements, two mutually spaced oscillation sensors for registering vibrations of the vibration element, each of which generates an oscillatory signal dependent on vibrations of the vibration element, as well as at least one oscillation sensor for registering vibrations of the vibration element and generating, dependent on vibrations of the vibration element, an oscillatory signal, which has a signal frequency corresponding to a resonant frequency, of the vibration element. Moreover, the measuring system also comprises a measuring and operating electronics, which based on a phase difference, existing between the oscillation signals and based on the signal frequency of the oscillation signal generates a measured value representing the volume flow rate, respectively the volume flow.

主权项

1. A measuring system for ascertaining a volume flow, namely a total volume flowed during a measurement interval, and/or a volume flow rate of a medium, flowing in a pipeline, measuring system comprising:
a first vibration element exhibiting a lumen, which first vibration element is adapted to guide in said lumen a part of the medium flowing with a first mass flow rate, and, while that is happening, to be caused to vibrate; at least a first oscillation exciter for exciting vibrations of said first vibration element in such a manner that said vibration element executes at least partially resonant oscillations, namely mechanical oscillations with a first resonant frequency; a first oscillation sensor for registering vibrations of said first vibration element, which first oscillation sensor is adapted to generate, dependent on vibrations of said first vibration element, a first oscillatory signal, which includes a signal frequency corresponding to said first resonant frequency; at least a second oscillation sensor spaced from said first oscillation sensor for registering vibrations of said first vibration element, which second oscillation sensor is adapted to generate a second oscillatory signal dependent on vibrations of said first vibration element in such a manner that said second oscillatory signal includes a signal frequency equal to the signal frequency of the signal component of said first oscillation signal, consequently corresponding to said first resonant frequency, as well as relative to said first oscillatory signal a phase difference, dependent on the first mass flow rate; a second vibration element, which second vibration element is adapted to be contacted, at least at times, by a part of the medium and, while that is happening, to be caused to vibrate; at least a second oscillation exciter for exciting vibrations of said second vibration element in such a manner that said second vibration element executes at least partially resonant oscillations, namely mechanical oscillations with a second resonant frequency, especially a second resonant frequency; at least a third oscillation sensor for registering vibrations of said second vibration element, which third oscillation sensor is adapted to generate, dependent on vibrations of said second vibration element, a third oscillatory signal, which includes a signal frequency corresponding to said second resonant frequency; and a measuring and operating electronics, wherein: said measuring and operating electronics is adapted to generate—by means of said first, second and third oscillation signals, namely based on the phase difference existing between said first and second oscillatory signal, and based on the signal frequency of said third oscillation signal—a measured value representing the volume flow rate, and/or said measuring and operating electronics is adapted to generate—by means of said first, second and third oscillation signals, namely based on the phase difference existing between said first and second oscillatory signals, and based on the signal frequency of said third oscillation signal—a measured value representing the volume flow.