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Consider the level loop shown in Fig. 5-3.2. The steady-state operating conditions are f i = f o = 150 gpm and h = 6 ft. For this steady-state the FC valve requires a 50 % signal. The level transmitter has a range of 0 to 20 ft. A proportional only controller, with Kc = 1, is used in this process. Calculate the offset if the inlet flow increases to 170 gpm and the valve requires a signal of 57 % to deliver this flow. Report the offset in % of scale and in feet.

Consider the level loop shown in Fig. 5-3.2. The steady-state operating conditions are f i = f o = 150 gpm and h = 6 ft. For this steady-state the FC valve requires a 50 % signal. The level transmitter has a range of 0 to 20 ft. A proportional only controller, with Kc = 1, is used in this process. Calculate the offset if the inlet flow increases to 170 gpm and the valve requires a signal of 57 % to deliver this flow. Report the offset in % of scale and in feet.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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Consider the level loop shown in Fig. 5-3.2. The steady-state operating conditions are f i = f o = 150 gpm and h = 6 ft. For this steady-state the FC valve requires a 50 % signal. The level transmitter has a range of 0 to 20 ft. A proportional only controller, with Kc = 1, is used in this process. Calculate the offset if the inlet flow increases to 170 gpm and the valve requires a signal of 57 % to deliver this flow. Report the offset in % of scale and in feet.
f(t), gpm h(t) LT 10 LC 10 FC SPD f(t), gpm Figure 5-3.2 Liquid level control loop.
Transcribed Image Text:f(t), gpm h(t) LT 10 LC 10 FC SPD f(t), gpm Figure 5-3.2 Liquid level control loop.
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