Consider the ratio control scheme shown in Fig. Each flow rate is measured using an orifice plate
Question:
Consider the ratio control scheme shown in Fig. Each flow rate is measured using an orifice plate and a differential pressure (D/P) transmitter. The electrical output signals horn the D/P transmitters are related to the flow rates by the expressions.
Each transmitter output signal has a range of 4 to 20 mA. The transmitter spans are denoted by Sd and Su for the disturbance and manipulated flow rates, respectively. Derive an expression for the gain of the ratio station KR in terms of Sd, Su, and the desired ratioRd.
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By definition the ratio station sets Thus For constant ...View the full answer
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Related Book For 
Process Dynamics And Control
ISBN: 978-0471000778
2nd Edition
Authors: Dale E. Seborg, Thomas F. Edgar, Duncan A. Mellich
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