This is a simple configuration to detect decrease occurrences using Event Frames in AF 2015. Example of an operational event that can be detected and analyzed with this configuration is a truck unloading process from a tank.
1.- A signal was simulated to represent the level increase and decrease over time:
2- These are the events generated, the nice thing is that you can see the start/end time as well as the duration of the event:
3.-Also, you can set up Event frames to show you other statistics derived from each event like: Max/Min Value, Avg, start/end value, avg of X minutes before the event occurs, all these calculations can be done in regards of the monitored value (Level) or other related variables (Pump pressures, flow meters,etc) during the event frame duration :
4.-This is the Event frame set up in AF analytics:
Let me know if you have questions or would like more information.