Improved low power consumption two-wire system vortex shedding flowmeter

A vortex flowmeter, two-wire technology, applied in the direction of volume/mass flow generated by mechanical effects, DC-coupled DC amplifier, and by detecting the dynamic effect of fluid flow, it can solve the problem that can only be applied to one caliber For liquid or gas flowmeters of one caliber, the threshold level and trigger amplitude cannot be adjusted, and the safety performance test cannot be passed, etc., to achieve the effect of enhancing anti-interference performance, adding temperature and pressure compensation circuits and functions, and enhancing the ability to resist electromagnetic interference.
CN101451864AInactive Publication Date: 2009-06-10HEFEI UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HEFEI UNIV OF TECH
Publication Date
2009-06-10
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to the field of flow detection, as an advanced low power consumption two-wire system vortex-shedding meter, comprising a piezo-electric transducer, a differential charge amplifier, a voltage amplifier, a programmable amplifier, a low pass filter, a voltage follower, a band-pass filter set, a band-pass select switch circuit, a peak detection circuit, a wave shaping circuit, asinglechip, a human-computer interface circuit, a 4-20mA output and power management circuit, a constant flow source, a temperature sensor, a pressure sensor, a differential amplifier and a 16-bit analog-to-digital converter. Mini FFT spectral decomposition is used to be combined with the analog band-pass filter set to process signals of a vortex sensor and a multicycle frequency measurement method of precision is used, thereby having temperature and pressure compensating circuit and function, outputting 4-20mA direct current and having two-wire system work. The advanced low power consumptiontwo-wire system vortex-shedding meter has greatly improved measure ratio, measurement precision and capacity of resisting disturbance.
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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] A Chinese invention patent announced a low-power two-wire vortex flowmeter (Xu Kejun, Zeng Xianjun, Zhu Zhihai, Liu Sanshan, etc. Low-power two-wire vortex flowmeter, application for invention patent, 200710162074.5, application date: 2007.11.14.). This flowmeter consists of piezoelectric sensor, charge amplifier, voltage amplifier, program-controlled amplifier, low-pass filter, voltage follower, peak detection circuit, band-pass filter bank, multi-way switch gating circuit, shaping circuit, single-chip microcomputer, human It is composed of computer interface circuit, 4-20mA output and power management circuit. The single-chip microcomputer detects the peak value and frequency of the vortex signal, and accordingly controls the program-controlle...

Claims

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