Method and device for monitoring hydraulic system in relation to ingress of foreign liquid

The invention relates to a method and a device for monitoring a hydraulic system in relation to the ingress of foreign liquid, the method comprising: detecting one or more operating parameters of the hydraulic system (100) over time as one or more signals; forming a signal portion of a defined length from the one or more signals (220); an input value is formed from each of the signal portions (220) and the input value is input into a trained classifier (142), where the trained classifier (142) is configured to classify the input value as one of a specified two or more categories, where the classifier (142) is configured to classify the input value as one of the specified two or more categories, and where the classifier (142) is configured to classify the input value as one of the specified two or more categories. Wherein the two or more categories include an indication of a status of a hydraulic fluid of the hydraulic system. 本发明涉及一种用于有关外来液体的进入来监控液压系统的方法和装置，所述方法包括：随时间检测所述液压系统(100)的一个或多个运行参数，作为一个或多个信号；从所述一个或多个