Vortex shedding flowmeter circuit arrangements.

摘要

A circuit arrangement for a vortex shedding flowmeter generates an analog signal proportional to the vortex shedding frequency and a pulse signal which equals or is proportional to the vortex shedding frequency signal. More specifically, a vortex shedding frequency signal from a vortex sensor (10) is passed via a preamplifier (12) and a threshold detector (14) to a one-shot (16) that generates fixed width pulses. An output (28) of the one-shot (16) is directed to a pulse signal network (22) and a low pass filter (20) to produce the pulse signal and analog signal, respectively. A scaling or range selection counter can be provided between the pulse signal and an output stage for changing the effective range of measurement by dividing the shedding frequency by a selected and known number.