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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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The upstream and downstream pressures associated with a differential pressure primary flow element are available at the taps of the element.
Both of these taps are piped to ports on the differential pressure flow transmitter that measures the pressure drop.
The differential pressure flow transmitter is a device that converts the differential pressure across its ports into an analog signal.
When the differential pressure flow transmitter has an integral square root function, its output signal can be linear with flow rate.
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Vortex shedding and other fluidic effects are oscillations that occur when fluids pass by an object or obstruction.
Examples of these effects in nature include the whistling caused by wind blowing by the branches of trees, the swirls produced downstream of a rock in a rapidly flowing river and the waving of a flag in the wind.
Note that in all of these examples, when the flow is slowed, the phenomenon ceases.
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Viscosity describes the ability of the fluid to flow over itself and it can be a determining factor in flowmeter selection.
Some flowmeters simply will not measure viscous fluids while other flowmeters can introduce error when measuring nonviscous fluids.
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ISSN 1538-5280
©2006 Spitzer and Boyes, LLC
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