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Digital Two-wire HART Vortex Flowmeter Transmitter Based on Double Charge Amplifier |
SHU Zhang-ping,XU Ke-jun,SHAO Chun-li,FANG Min |
School of Electrical and Automation Engineering, Hefei University of Technology, Hefei, Anhui 230009, China |
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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.
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Received: 22 February 2016
Published: 27 September 2017
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Corresponding Authors:
Ke-Jun Xu
E-mail: dsplab@hfut.edu.cn
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