The Anomaly Watch queue

Anomaly Watch compares each reading with how that same machine normally behaves, in the same running state and on the same product, and flags what has moved out of its usual range. The queue lists those unusual readings as cards, one each, for a person to judge.

A card

Each card shows:

• The reading, named the way the plant names it (for example DCM-204 metal temperature).
• A small chart of the reading. For a reading with a setpoint, the chart shows the gap from the setpoint, dashed lines at the edges of the allowed band, and dots on the readings outside it.
• When it was first seen. A slow drift that has come back several times says how many times.

Kinds of unusual reading

Use Show to pick which kinds to see. A kind is listed only while it has open cards.

Kind	Means
Drift	The reading has moved away from its usual level and stayed there.
Slow trend	A steady climb or fall over days, such as wear.
Setpoint and control	The reading is not following its setpoint.
Outside normal band	Outside the normal range set for it.
Stuck	The reading stopped changing while the machine ran.
Rate of change	It changed much faster than it normally does.
Per run	Something about each run, for example a pump moving less water per amp.
Per part	For a reading taken once per part: more parts outside limits, a shift in the average, or the same value repeated.
Quality	The reading's data quality is bad.

Judging a card

Each card takes Real issue, Known or Not an issue. A Real issue proposes an alarm rule; see Giving feedback.

Past fires lists times a saved alarm rule would have fired, waiting for review. Reviewed lists cards someone has already judged.

The queue refreshes every minute and whenever a check finishes.