The results are shown for the lowest plants, the highest plants, and the averages of all plants surveyed. Remember, this is a survey! The number of alarms per control loop varied from a high of 6 to a low of 1 with an average of 4. Similarly, the alarms per analog measurements varied
between 2 and 0.5 for an average of 1; the number of digital measurements alarmed varied from 0.6 to 0.2 with an average of 0.4.