The paper proposes a comparison of different strategies of regressors selection for the design of a Soft Sensor for a Sulfur Recovery Unit of a refinery. The Soft Sensor is designed to replace the on line analyzer during maintenance and it is designed by using nonlinear MA models implemented by a MLP neural network. A number of strategies for the automatic choice of influent input variables and regressors selection, on the basis of available experimental data, are compared with a strategy based on a trial and error approach, guided by the knowledge of the experts, both in terms of their performance and their computational complexity
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