Process monitoring technique and related actions

摘要

The invention provides a novel method of monitoring a process. The method alsohas the ability to take predetermined actions based on the monitored data. Theseactions avoid or mitigate process abnormalities or upsets that might impactproduct quality, production, and/or process efficiencies. The method includesthe steps of: obtaining at least one input process variable; determining a comparativeprocess value based on the at least one input process variable using a first methodhaving a first time-based weighting function; determining an expected processvalue based on the at least one input process variable using a second method havinga second time-based weighting function; determining a first deviation valuebased on the at least one input process variable or historical data; calculatinga limit range having a maximum limit and a minimum limit using the expected processvalue and the first deviation value; and comparing the comparative process valueto the limit range.