Pipe type ultrasonic flowmeter is composed of a main body and a pipe segment type sensor. The DN15-DN32 uses a -type pipe segment sensor, and the DN40 and above uses a standard pipe segment sensor. The pipe-type ultrasonic flowmeter has the advantages of simple installation, low starting flow, high measurement accuracy, and no pressure loss. The main unit can be installed in the wall, instrument box, and distribution box with a protection level of IP67. The external clip sensor is installed on the surface of the pipe and selects different sensors. The applicable diameter is DN15~DN6000.