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DAVID W. SPITZER'S E-ZINE
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TECHNICAL AND MARKETING SERVICES FOR INSTRUMENTATION SUPPLIERS AND END-USERS
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In Doppler ultrasonic flowmeters, ultrasonic energy is transmitted into the pipe. Some of this energy is reflected by particles, bubbles, and eddies in the flow stream. The frequency difference between the transmitted energy and its reflected ultrasonic signal is used to determine the flow in the pipe.
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For the past few installments of "Applications Corner," we’ve been considering some unique applications that I’ve run into over the years. Last month we examined instrument selection for below absolute zero pressure. This month we’ll consider how processes that operate at pressures below atmospheric pressure impact flow measurement.
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Most flowmeters are sensitive to the upstream and downstream piping in which they are installed. They are especially sensitive to the upstream piping, so much so that many discussions only focus on the upstream piping, even though both can be important.
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