The post AutoQuiz: How to Assess the Optimal Alarm Deadband Setting first appeared on the ISA Interchange blog site.
Today’s automation industry quiz question comes from the ISA Certified Automation Professional certification program. ISA CAP certification provides a non-biased, third-party, objective assessment and confirmation of an automation professional’s skills. The CAP exam is focused on direction, definition, design, development/application, deployment, documentation, and support of systems, software, and equipment used in control systems, manufacturing information systems, systems integration, and operational consulting. Click this link for more information about the CAP program.
e) none of the above
Answer A, 10% is not the best choice as it is the difference between normal operation and the high alarm condition, so the high alarm will not clear until the pressure has dropped below 50 psig.
Answer B, 5% is not the best choice as it is more than twice the signal noise and a significant part of the range between normal operation and the high alarm condition.
Answer D, 1% is not the best choice as it is less than the signal noise and will likely create a chattering alarm.
The correct answer is C, 2%, as the noise is under 2%
Reference: Bill R. Hollifield and Eddie Habibi, Alarm Management: A Comprehensive Guide
Source: ISA News