Patent ID: 7523384

Claim:
A method for monitoring of and fault detection in a process chain in an industrial process, said industrial process comprising at least a first sub-process, Step 12 , 23 , 72 , having first variables, X 2 , and at least one second sub-process, Step 11 , 21 , 22 , 71 , 73 , having second variables, X 1 , arranged in a process chain, said first sub-process being performed after said second sub-process in said process chain, said method comprises the steps of: collecting data including said second variables and calculating a multivariate sub-model based on said collected data comprising weighted averages, t 11 , t 12 , t 41 , t 42 , t 5 , t 7 , t 8 , t 9 , for said second variables for the at least one second sub-process, Step 11 , 21 , 22 , 71 , 73 ; receiving in the first sub-process, Step 12 , 23 , 72 , from the at least second sub-process, Step 11 , 21 , 22 , 71 , 73 , said weighted averages, t 11 , t 12 , t 41 , t 42 , t 5 , t 7 , t 8 , t 9 ; collecting data including said first variables related to the first sub-process, Step 12 , 23 , 72 ; and calculating a multivariate sub-model for the first sub-process, Step 12 , 23 , 72 , based on said collected data including said first variables and said weighted averages, t 11 , t 12 , t 41 , t 42 , t 5 , t 7 , t 8 , t 9 .