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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 that have non-mechanical sensors that do not contact the material include laser, non-contact radar, and ultrasonic level measurement technologies. In general, these level measurement systems use level sensors that are located above the material and are not directly exposed to the material. These sensors are exposed to the environment of the material in normal operation and can come in contact with the material when the level of the material is excessively high.
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Most differential pressure (DP) primary flow elements have straight run requirements, so they’re usually not applied where limited straight run is available. In addition, DP primary flow element technology has Reynolds number constraints, so it may find limited application in low flow applications, and where the liquid exhibits high or varying viscosity.
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Differential-pressure producers, such as an orifice plate, Venturi, nozzle, and the like, are commonly applied in conjunction with a differential-pressure transmitter to comprise a flow measurement system. How might the performance of this type of flow measurement system be stated?
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