Applied to the zero comparison circuit of ultrasonic flowmeter

Thus analog comparator IC1 (MAX987) negative input 4 feet and positive input 3 feet of echo signal respectively Vi Vi and the echo signal of dc component, thus realized the real zero comparative test, the output of the comparator IC1 output 1 foot in contrast to the same phase Vi signal frequency pulse signal Vo, single-chip microcomputer detecting pulse signal through gathering Vo, can calculate the inverse process of ultrasonic flowmeter is routine or time to calculate the flow rate, reduce the measuring error, improve the accuracy of measurement.
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Increasing consumer awareness and rising concern about improving rosemount coriolis mass flow meter are driving the market of products.