Average alarm rate per hour per IEC 62682 alarm-management standard - excessive rates indicate need for alarm rationalisation.
Formula
$$ r = \frac{n_{alarms}}{n_{op}} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $n_{alarms}$ | Alarm count in period | alarms | HMI log |
| $n_{op}$ | Operators present | - | watch roster |
Sources
- IEC 62682 / EEMUA 191.