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

摘要

Monitoring means 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 (MR_MD) of the measurement devices (MD) involved in the performance of the step, and determined based on a model of the step, comprising primary models for the measurement devices (MD) comprising a basic function (f_MD(t; C_MD)) representing a time dependency of the measurement results (MR_MD) of the device (MD), a first property (K1) determined by best fitting the basic function (f_MD(t; C_MD)) to the measurement results (MR_MD) obtained by the respective measurement device (MD), a secondary model for each of the primary models, each comprising a second property (K2) given by a dispersion of residues (Δ_MD) between the measurement results (MR_MD) obtained by the respective measurement device (MD) and the corresponding fitted function (f_MD(t, D_MD)), and tertiary models for those pairs of measurement devices (MDa, MDb), which render correlated measurement results (MR_MDa, MR_MDb) during faultless performance of the respective step, each tertiary model comprising a third property (K3), given by a degree of correlation (Corr(MR_MDa, MR_MDb)) between simultaneously obtained measurement results (MR_MDa, MR_MDb) of the respective pair of measurement devices (MDa, MDb) during performance of the respective step, and a reference range (R_K) for each of the properties (K), comprising a range within which the respective property (K) is expected to occur during faultless performance of the step.