A sensor assembly is configured to mount transducers on a conduit, such as a pipe, for measuring properties of a fluid flowing in the conduit. The sensor assembly can include a sensor cradle capable of seating and maintaining a pair of transducers. The sensor assembly can include a mounting device arranged to couple the sensor cradle to the conduit such that the transducers maintained at the sensor cradle are oriented to allow transmission of ultrasonic waves traversing the conduit. The sensor assembly allows for mechanically stable coupling of the transducers to the conduit. The transducers can be fixed to the sensor cradle though an adhesive. In some implementations, the transducers can be oriented substantially orthogonal to each other.