Abstract: There is provided a controller, a system, computer software and a method for detecting a ligature on a door mounted within a door frame on mounting means. A load applied by the door to the mounting means is detected by a load sensor. An angle of the door relative to the door frame is detected by an angle sensor. Baseline load data is obtained, the baseline load data being indicative of an expected load applied by the door to the mounting means as a function of the angle of the door. The method comprises determining a threshold load value indicative of a ligature on the door for the measured angle in dependence on the baseline load data and the detected angle of the door; determining whether the detected load exceeds the threshold load value for the detected angle; and outputting an indication of a detected ligature event if the detected load exceeds the threshold load value.

Abstract: A method of detecting a ligature on a door is provided whereby the load applied by the door to a load sensing means and the movement of the door relative to the door frame are used to determine whether a ligature is being applied to the door to thereby trigger an alarm. Apparatus for carrying out the method is also provided.