基于双电荷放大器的数字式两线制HART涡街流量变送器

doi:10.3969/j.issn.1000-1158.2017.06.10

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Abstract A digital two wire HART vortex flowmeter transmitter based on double charge amplifiers is developed in order to solve the problems that there is low sensitivity in the high temperature resistant vortex flowmeter sensor, and HART communication increases power consumption and its stability is easily affected by the power. The signal conditioning circuit concluding two-stage charge amplifier and two-stage low-pass filter is designed to amplify and filter the low output amplitude of high temperature resistant vortex flow sensor, and obtain the stable flow signal. Two isolated power supply scheme is adopted to improve load ability of power supply and ensure the stability of the communication, which achieves two-wire HART communication during the digital signal processing. The experimental results show that the transmitter possesses high measurement accuracy, small measurable low limit, and also meets the requirements of power consumption.

Key words： metrology vortex flowmeter transmitter two-stage charge amplifier two isolated power supply high temperature resistant vortex flowmeter sensor two-wire HART

Received: 22 February 2016 Published: 27 September 2017

PACS:

TB937

Corresponding Authors: Ke-Jun Xu E-mail: dsplab@hfut.edu.cn

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	SHU Zhang-ping
	XU Ke-jun
	SHAO Chun-li
	FANG Min

Cite this article:

SHU Zhang-ping,XU Ke-jun,SHAO Chun-li, et al. Digital Two-wire HART Vortex Flowmeter Transmitter Based on Double Charge Amplifier[J]. Acta Metrologica Sinica, 2017, 38(6): 702-707.

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http://jlxb.china-csm.org:81/Jwk_jlxb/EN/10.3969/j.issn.1000-1158.2017.06.10 OR http://jlxb.china-csm.org:81/Jwk_jlxb/EN/Y2017/V38/I6/702

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