Condition monitoring refers to the continuous monitoring of the condition of equipment by sensors. The aim is to detect changes that indicate possible damage so that repairs can be carried out before failure occurs.

The main idea is to take action when components of a machine show certain behaviours that usually lead to a downward trend in product quality, deterioration of the machine or failure. It indicates the need for maintenance action before the actual damage occurs or the product quality changes drastically. The basis of this approach is the collection of a large amount of machine data and the methods used to detect anomalies.