Architecture of the Fault Diagnosis Scheme

Due to the level of risk related to highly exothermic chemical processes, sensors for temperature monitoring are often duplicated in batch reactors. Hence, a duplex sensor architecture is assumed. Namely, two temperature sensors (hereafter labeled as Sr, i and. Sr2) providing measurements of Tr, and two providing measurements of 7] (hereafter labeled as Sj,i and 6 2) are assumed to be available. 

In order to achieve both sensor fault detection and isolation, two state observers of the system are adopted the first observer uses the measurements provided by Sr, 1 and 5j i, while the second observer uses the measurements provided by Sr 2 and 6 2- 

A suitable designed diagnostic system, together with a Decision Making System (DMS), declares the occurrence of a fault, isolates the possible faulty sensor, and outputs an healthy signal. 

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