Abstract: A monitoring device of a monitoring system includes a control, an alarm, a first sensor for detecting motion higher than a first predetermined height, a second sensor for detecting, on a floor of a building, motion lower than a second predetermined height, and a third sensor means for detecting an arrival in a sleeping place and a departure from the sleeping place. When the most recent motion detection fed by the third sensor to the control is the arrival in the sleeping place, the control controls the alarm to give an alarm if a predetermined first delay, beginning at the arrival in the sleeping place, is filled before information about the departure from the sleeping place has been received from the third sensor. After the third sensor has detected the departure from the sleeping place, the control controls the alarm to give an alarm if the control receives no motion detections from the first sensor and the second sensor during a predetermined second delay.

Abstract: A monitoring device of a monitoring system includes a control, an alarm, a first sensor for detecting motion higher than a first predetermined height, a second sensor for detecting, on a floor of a building, motion lower than a second predetermined height, and a third sensor means for detecting an arrival in a sleeping place and a departure from the sleeping place. When the most recent motion detection fed by the third sensor to the control is the arrival in the sleeping place, the control controls the alarm to give an alarm if a predetermined first delay, beginning at the arrival in the sleeping place, is filled before information about the departure from the sleeping place has been received from the third sensor. After the third sensor has detected the departure from the sleeping place, the control controls the alarm to give an alarm if the control receives no motion detections from the first sensor and the second sensor during a predetermined second delay.

Abstract: The movement of persons is indicated at least at two predefined locations in a building with motion detectors intended for monitoring each location and fastened to the building. By means of the detections, the movement of each person is detected from a predefined initial location to a predefined destination location in a predefined time without raising an alarm if the detected locations of the person form a line of predefined consecutive locations. Otherwise, an alarm is raised.

Abstract: The movement of persons is indicated at least at two predefined locations in a building with motion detectors (108, 110) intended for monitoring each location and fastened to the building. By means of the detections, the movement of each person is detected from a predefined initial location (102) to a predefined destination location (104) in a predefined time without raising an alarm if the detected locations of the person form a line of predefined consecutive locations (116, 118). Otherwise, an alarm is raised.