The invention is aimed at generating a finely dispersed gas-and-drop flow with its cross-section in the shape of an ellipse and uniform intensity distribution. Embodiments advantageously include balancing transformer configurations that are relatively cost-effective, reliable, efficient, and good performing. In some embodiments, the distinct set of audio data values is defined by a predetermined distinct tone. In addition, the mounting foot may have a mounting bracket. The pre-biased indicator is configured to provide a discrete visual signal that the pressure of the fluid in the continuous flow path is different from a predetermined level of pressure, thereby indicating a fluid flow condition.