To Be an Alarm…Or Not to Be?Thursday, March 22, 2012
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That is the question.
When your alarm does not meet the definition as defined in the ISA-18.2 standard and/or the criteria established in your alarm philosophy document, it is not an alarm.
By ISA-18.2 definition “an alarm is an audible and /or visible means of indicating to the operator an equipment malfunction process deviation, or abnormal condition requiring a response.” This means that alarms should only be used to indicate when something is wrong (not an expected event) and that if a (timely) operator response is not required (other than acknowledging it), then the point should not be an alarm.
How about “alarms” that don’t meet the definition for being an alarm? These are called “non-alarms.” The…