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Permanent link (DOI): https://doi.org/10.7939/R3BM52
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Alarm limits, deadbands and chattering Open Access
- Other title
- Type of item
- Degree grantor
University of Alberta
- Author or creator
- Supervisor and department
Chen, Tongwen (Electrical Engineering)
- Examining committee member and department
Zhao, Qing (Electrical Engineering)
Shah, Sirish (Chemical Engineering)
Department of Electrical and Computer Engineering
- Date accepted
- Graduation date
Master of Science
- Degree level
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.
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.
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.
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