STEAM FLOW DETECTION Flow DetectorsAs the previous equations demonstrate, temperature and pressure values can be used toelectronically compensate flow for changes in density. A simple mass flow detection system isillustrated by Figure 9 where measurements of temperature and pressure are made withcommonly used instruments.Figure 9 Simple Mass Flow Detection SystemFor the precise measurement of gas flow (steam) at varying pressures and temperatures, it isnecessary to determine the density, which is pressure and temperature dependent, and from thisvalue to calculate the actual flow. The use of a computer is essential to measure flow withchanging pressure or temperature. Figure 10 illustrates an example of a computer specificallydesigned for the measurement of gas flow. The computer is designed to accept input signalsfrom commonly used differential pressure detectors, or from density or pressure plus temperaturesensors, and to provide an output which is proportional to the actual rate of flow. The computerhas an accuracy better than +0.1% at flow rates of 10% to 100%.IC-04 Page 14 Rev. 0
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