Sensor device of ultrasonic flow meter

The utility model relates to a sensor device of an ultrasonic flow meter, comprising a shell welded with a flange, bases, a probe, as well as a probe seat, pressing rings, a positioning plug, an O-shaped ring and an O-shaped ring, wherein the two base are respectively and vertically fixed on two side surfaces of the shell; the two probes are respectively provided with the O-shaped rings which are respectively fixed with the probe seat; the two probe seats are respectively provided with the O-shaped rings which are respectively arranged in the base; the two positioning plugs respectively fix the probe seats and the bases together; and the two pressing rings are respectively arranged in and fixed with the bases . The sensor device has the benefits that the ultrasonic water meter device comprises special structure members such as the probe, the bases, the probe seats, the positioning plug and the like, can reduce the influence brought by the standard length of the shell, realize the purpose of prolonging the sou