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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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Level measurement systems are used to sense the location of the interface between two or more materials in a fluid containment system. Level measurement systems generally consist of a level sensing device (sensor) and a level transmitter, although some designs have an integral sensor and transmitter. These devices are used to measure one or more interfaces.
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Seemingly minor details can sometimes make a large difference in flowmeter performance.
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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 that 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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