SELF-TEST FOR GAS LEAK DETECTOR.

摘要

An ultrasonic detector (10) suitable for mounting in a position for surveying an area for a source of airborne ultrasound, which detector comprises:
a plurality of sensors (20; 110) for detecting an ultrasonic sound signal, each sensor of said plurality of sensors comprising a sensing face (30; 116);
a housing (12) comprising a convex external surface;
wherein said plurality of sensors (20; 110) is arranged on said convex external surface so that each sensing face (30; 116) is oriented in a direction different to every other sensing face.