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Water flows through four connected tanks and is heated along the way, as illustrated. To implement a cascade control system that regulates the temperature of the water exiting tank 4, considering a disturbance in the temperature of a secondary stream entering tank 2, where is the optimal location for the secondary measurement in the inner control loop?

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Subject
Process Control and Instrumentationchemical-engineering › process-control-and-instrumentation
Published
5 Mar 2019
Last updated
28 May 2026

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Explanation

For cascade control, the secondary measurement should be taken at tank 3, which is immediately downstream of tank 2 where the disturbance occurs. This allows the inner loop to quickly respond to changes before the final temperature at tank 4 is affected.

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