Water, in the shape of air bubbles, can be found in the cleaning liquid, especially when the detergent has just been melted into the water or when its temperature is still low. Air bubbles undermine a good propagation of the sonar waves generated by PZT transducers. This is because sound speed is proportional to the density of the medium it propagates through: for iron is 5,000 mt/sec, for water is 1.100 mt/sec, for air is 300 mt/sec. In this specific case, waves travel into the cleaning liquid at 1,200 mt/sec; if they encounter an air bubble they lose speed and change their course, or even turn back if air bubbles are too dense.

Ultrasonic waves are able to degas water in a natural way, but this needs a specific amount of time (10-15 minutes with warm liquids). In order to accelerate this process, our generators offer a peculiar function named DEGASSING, which in a short lapse of time generate special wave trains made of many frequencies, By doing so, they accelerate the outgoing of air over the whole tank volume, therefore the ultrasonic action achieves maximum performance.