Exterior wall-coupling type ultrasound system for measuring density and method for same

The present invention relates to an exterior wall-coupling type ultrasound system for measuring density and a method for same, and comprises: an ultrasound sensor portion, which is coupled to the exterior wall of a pipe through which a fluid to be measured flows, for transmitting and receiving ultrasound through a wall; and a density measurement device for measuring density depending on the strength of ultrasound that passes through the pipe, the fluid to be measured, and the pipe by means of the ultrasound sensor portion, wherein the process involves a real time (RT) mode step of monitoring change in density in real time through the ultrasound sensor portion and the density measurement device in accordance with an operation pattern on the field, and a process monitoring (PM) mode step of automatically measuring change in density through the ultrasound sensor portion and the density measurement device only when the process is in operation, based on a process condition monitoring (PCM) result. As a result, the