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Author: search.filters.author.Baiche, KarimSubject: search.filters.subject.Average alarm delay

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    Performance comparison of various delay timers on alarm system design
    (2018) Kaced, Radhia; Kouadri, Abdelmalek; Baiche, Karim
    Alarm systems are critically important for safety and efficiency of industrial plants. Not designed properly or not receiving the attention they deserve, alarm systems suffer from poor performances. Alarms notify the operator of the abnormality on the plant. Unfortunately, most of these alarms are false and nuisance, they can be a real distraction to the operator and may additionally mask vital alarms. Deadbands, filters and delay timers are industrial techniques proposed by the industrial community to reduce false and nuisance alarms. In this paper, we investigate the use of three different delay timers; conventional delay timer, generalized delay timer and multi-setpoint delay timer; in the process and compared their effects on accuracy and detection delay. False alarm rate (FAR), Missed alarm rate (MAR) and average alarm delay (AAD) are the three performance indices used to design optimal alarm system. Simulation results show that alarm performances can be improved and even optimized via delay-timer with proper choice of the delay timer order
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    Designing alarm system using modified generalized delay-timer
    (Elsevier, 2019) Kaced, Radhia; Kouadri, Abdelmalek; Baiche, Karim
    Alarm systems are of crucial importance in ensuring safety and efficiency of industrial installations. In practice, alarm systems are not properly designed or given the attention they deserve; their performance is unsatisfactory. The main role of alarms is to inform the operator of any incident in the plant. Regrettably, most occurred alarms are false and nuisance. To avoid this, industrial community developed techniques like deadbands, filters and delay-timers. Delay-timer is largely exercised in industry. This article presents a new concept for designing a Generalized delay-timer. out of n consecutive samples is not the only condition to activate an alarm, we will use additional setpoints to rise or clear an alarm. Three performance indicators namely, False Alarm Rate (), Missed Alarm Rate () and Average Alarm Delay () are computed for the proposed method. At the end, the modified Generalized delay-timer method is examined and compared with the Generalized delay-timer using a simulation and industrial case studies The obtained results show that alarm system performance is improved and even optimized using the modified Generalized delay-timer