The Ultrasonic Humidifier
The ultrasonic humidifier uses high frequency sound waves to vibrate a metal plate to nebulize water into a fine mist, which adds humidity to the air. A transducer changes shape with an alternating pulse of energy thousands of times a second to do this. Sometimes called an atomizer, which is a misnomer, come in many forms. Some work with steam by boiling water, some with an impeller, which is a rotating disc that flings the water at a comb-like diffuser. They have some that work on an evaporative system, using a wick and a fan. They all do the same thing, just by different methods.
We will concentrate on ultrasound models here.Models are small, portable and easy to use. Some have monitors to keep an eye on the humidity and shut off at the preset level. If they don't, you can buy an inexpensive hygrometer to do this. The humidity in a normal house is usually very low due to heating systems. The recomended humidity is between 30% and 50%.
All humidifiers have a similar drawback. The problem comes with stagnant water and chemicals, minerals and impurities within the water. Standing water can cause respiratory problems because of the bacteria, viruses and fungi when nebulized. Some ultrasonic units use ultraviolet light to kill bacteria. If you use one, you are recommended by the FDA to use low mineral water, such as distiller water. Many models have de-mineralization cartridges to filter minerals out.
From ultrasonic humidifier back to Industrial ultrasonics.