[. . . ] [. . . ] For example, when set to detect air-in-line the LifeGuard IQ is able to quantify bubble size, count number of bubbles, and quantify accumulated volume of air. 4 LifeGuard IQ incorporates proven LifeGuard swept frequency technology. 4 Microcontroller allows the sensor to tune into the resonant frequency thereby sweeping a narrower range around a "sweet spot". This enables the sensor to sweep more rapidly and more often, resulting in increased sensor efficiency. [. . . ] [. . . ]