Monitoring means and monitoring method for monitoring at least one step of a process run on an industrial site

摘要

Monitoring structure and a monitoring method for monitoring at least one step of a process performed on an industrial site is described, which allows prompt, reliable and efficient detection of disturbances based on readily available information, provided by the measurement results of the measurement devices involved in the performance of the step, and determined based on a model of the step, comprising primary models for the measurement devices comprising a basic function representing a time dependency of the measurement results of the device, a first property determined by best fitting the basic function to the measurement results obtained by the respective measurement device, a secondary model for each of the primary models, each comprising a second property given by a dispersion of residues between the measurement results obtained by the respective measurement device and the corresponding fitted function, and tertiary models for those pairs of measurement devices, which render correlated measurement results during faultless performance of the respective step, each tertiary model comprising a third property, given by a degree of correlation between simultaneously obtained measurement results of the respective pair of measurement devices during performance of the respective step, and a reference range for each of the properties, comprising a range within which the respective property is expected to occur during faultless performance of the step.