As discussed in previous sections of this knowledge centre, most systems are heterogeneous in nature. The contaminants in your process are not evenly distributed and therefore the data can vary from instrumentation one minute to the next.
Process capability is the ability for a system to maintain a set working level. In most instances, averages along with the standard deviation need to be taken into account to arrive at a repeatable and predictable result. Taking the average result in isolation can be a source of error.
Knowing the capability of your system can inform you about decisions to replace filters or add filters to your system. Depending on how efficient your system is, it may extend or shorten the time between element replacements. In addition to this, you can use this statistically sound data to help you in other areas of continual improvement and proposal justification. It also makes for more suitable warning alarm limit settings.