Dispositivo di monitoraggio per monitorare un settore limite di una zona di sicurezza

A monitoring device for monitoring a monitored zone which is adjacent to a safety zone is provided. The monitoring device comprises:a light curtain device for detecting an object touching a boundary section located at a boundary between the monitored zone and the safety zone;a time-of-flight device for detecting a distance to the object and/or a size of the object;an evaluation device for emitting an evaluation result based on the distance to the object and/or on the size of the object determined by the time-of-flight device, and optionally based on a light curtain signal from the light curtain device; anda muting device for temporarily deactivating the light curtain device along a muting height of the light curtain device as a function of the evaluation result.