Two-wire system vortex street flowmeter

Abstract

The present invention relates to the flow detection field, in particular to a low power consumption two-wire system vortex street flowmeter which consists of a piezoelectric transducer, a charge amplifier, a voltage amplifier, a program-controlled amplifier, a lowpass, a voltage follower, a peak detection circuit, a band-pass filter set, a multiway switch gate circuit, a wave shaping circuit, a singlechip, a man-machine interface circuit and a 4-20 mA output and power management circuit, wherein, the singlechip detects the peak value and the frequency of the vortex street signal to amplify and filter the vortex flow signals by controlling the program-controlled amplifier and the band-pass filter. The technology overcomes the problems that the prior art can not achieve low power consumption while measuring small flow, expanding measuring range rate and improving measuring precision effectively. While ensuring measuring small flow, expanding measuring range rate and improving measuring precision effectively, the invention achieves low power consumption of outputting the direct current of 4-20 mA and the operating current less than 4mA and achieves the two-wire system operation.

Description

technical field [0001] The invention relates to the field of flow detection, and is a low-power two-wire vortex flowmeter, in particular a low-power, Two-wire vortex flowmeter signal processing system. Background technique [0002] The vortex flowmeter has the characteristics of various types of measuring media, and is widely used in the field of fluid flow measurement. However, conventional signal processing methods, namely amplification, shaping, filtering, and counting, cannot effectively measure small flow rates, have limited range ratios, and cannot guarantee on-site measurement accuracy. At the same time, some applications require low-power, two-wire instruments that output 4-20mA DC current, that is, from an electrical point of view, there are only two wires connecting the instrument to the outside, and the power line and signal line are multiplexed. 24V (or 12V) DC power supply, and the DC power supply is connected in series with the sampling (load) resistor. 4mA ...

AI Technical Summary

Problems solved by technology

However, conventional signal processing methods, that is, amplification, shaping, filtering and counting, cannot effectively measure small flow rates, the range ratio is limited, and field measurement accuracy cannot be guaranteed

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