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in this example we have 2Nos. Ai , 1Nos. AO and 2Nos. PIDAT. The PIDAT in the outer loop has Temperature of liquor inside a reactor (SP of 75°C) as PV.The inner PIDAT is controlling the final element of the loop with lower inertia, ie steam Temperature inside the jacket. Finally the steam valve feeding the reactor jacket is controlled by combined action of both the PIDAT. SP of steam is 175°C.