The mass flow meter according to the coriolis principle with absolute frequency output and a method for generating a frequency output signal.

摘要

Apparatus and accompanying methods are disclosed herein for use in a Coriolis mass flow rate meter for producing an "absolute" frequency output. This method is illustratively implemented within a microcontroller through use of various software steps, two internal timers and one external gate. The frequency signal present on this output advantageously contains a number of pulses having an approximate 50% duty cycle over a relatively wide dynamic range wherein the number of such pulses occurring during any timing interval is proportional to the measured mass flow rate but without substantially any extraneous pulses that would otherwise occur due to nested interrupt processing. As such, use of such a frequency output advantageously ensures that internally and externally maintained totalized mass flow values will not substantially diverge, if at all, over time.