| Receiving false and nuisance alarms is a well known problem in industrial alarm systems. The main cause of this problem is poor alarm design which is the result of huge number of configured alarms and lack of automatic and analytical design methods.;Since reduction of alarm chattering is a primary goal in redesigning the alarm parameters, the analytical relation between chattering with alarm parameters and process data is also investigated. The alarm chattering index is derived as a mathematical function of alarm limits, deadbands, time delays and statistical characteristics of the process data.;This study targets deriving analytical methods for designing alarm parameters such as alarm limits, alarm deadbands and delay timers. The relation between false and missed alarm rates along with chattering is investigated with alarm limits and deadbands. There are two equations presented to estimate the optimal alarm limit with respect to deadbands and statistical characteristics of the process data. |
