OF ULTRASONIC HUMIDIFIERS
humidifiers vibrate a water mist into the air
by using piezoelectric crystals (transducers).
The transducers are mounted in a basin of water
approximately 1.5 inches deep. Each transducer
is approximately the size of a nickel and vibrates
at approximately 1.6 megahertz, a speed so fast
that the water above the crystal cannot follow
the speed of the transducer, causing the water
to cavitate. This process emits very small water
droplets into the air, approximately one micron
in diameter (similar in size to steam droplets).
The water droplets are so small that they evaporate
almost immediately. The water feeding an ultrasonic
humidifier must be pure so that minerals and
other contaminants are not vibrated into the
air. Such purity is achieved with de-ionized
(DI) water filters to remove all minerals and
foreign matter from the water. DI water offers
additional benefits. It assures a pure, clean
mist for those breathing the air, and it significantly
reduces the amount of maintenance required for
the humidifier, i.e. no scaling or sludge to
be removed from the humidifier pan.