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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 concepts of pH and ORP require some explanation because they tend to be more abstract than temperature, pressure and flow rate.
Both pH and ORP measurements are primarily made in aqueous solutions so a reasonable understanding of these measurements requires some knowledge of the chemistry of water.
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How do you compare flowmeters?
Which dimensions do you use? How do you weigh them?
Why is a flowmeter needed in the process?
There is no one answer to these questions, but there are some general concepts available that can help you get the results you need.
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A flow control loop consisting of a flowmeter, controller, and control valve is used to control the flow of a gas to a process.
Measurements from a pressure transmitter installed some time ago indicate the incoming air pressure is typically two bar, but it can vary from one to 2.5 bar due to process upsets that occur upstream.
How will these pressure variations affect the flow measurement, assuming the flowmeter is calibrated to operate at a typical pressure of two bar?
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ABOUT SPITZER AND BOYES, LLC
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Spitzer and Boyes, LLC sells
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ISSN 1538-5280 ©2006 Spitzer and Boyes, LLC
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