On the impact of sensor maintenance policies on stochastic-based accuracy

The concept of stochastic-based accuracy and its calculation procedure for the case of corrective maintenance in data reconciliation-based systems were recently presented [Bagajewicz, M. (2005b). On a new definition of a stochastic-based accuracy concept of data reconciliation-based estimators. In: Proceedings of the 15th European symposium on computer-aided process engineering: Bagajewicz, M., & Nguyen, D. (2008). Stochastic-based accuracy of data reconciliation estimators for linear systems. Computers and Chemical Engineering, 32(6),1257-1269]. This paper discusses the effect of preventive maintenance policies in chemical plants on stochastic-based accuracy. We show and evaluate a few practical solutions to the problem. The extent to which an effective maintenance policy helps to improve accuracy is shown and the economic justification is provided. Two examples are provided. (C) 2009 Elsevier Ltd. All rights reserved.