Ozone is a kind of minor gas in earth atmosphere, and it’s so unstable that it can be decomposed into oxygen at normal temperature. In 1785, Germen first noticed this odorous gas while using electrodes. In 1840, French scientist Christian Fred named it Ozone. When ionizing the air, or using ultraviolet germicidal lamp to decompose oxygen, ozone is generated. In the nature, ozone can assimilate most shortwave radiations, such as ultraviolet, which protects human beings and other living creatures. In addition, ozone has been widely used in food sterilization and medication.
Ozone is very oxidable. Exposed to ozone at a higher concentration of 4ml/L, HBV can be 100% wiped out in 1 minute. With the ozone concentration between 0.25 to 0.38 ml/L, HAV can only endure several seconds to several minutes. However, excessive ozone can be harmful to human beings.
Nowadays, most ESP purifiers in the market ionize the air to purify the air. When air is ionized, some air negative ions are produced, which are very unstable and easy to lose an electron to form ozone.
ESP purifiers can actually produce a small amount of ozone, which is harmful over a certain concentration, especially to those who suffer from asthma, emphysema, chronic bronchitis. However, ozone has its benefits. It can serve as a purifier to reduce formaldehyde into carbon dioxide and water, and it can be reduced into oxygen in 30 minutes. Ozone is also an effective sterilizer, which can eliminate bacteria cells, viruses and fungi. Its disinfection rate can be as high as 99.99% in 15 minutes at a certain concentration.
The electric filed of ESP purifiers can be made of stainless-steel needles, antirust aluminum tubes and PCB epoxy plates. Electric welding is used in needle electrode combination as it’s not easy to produce ozone. As stainless electrode is in the middle of the hole, it has the same arcing distance among every point of the wall of the hole, and no spark appears. A good-quality ESP purifier produce 0.040PPM ozone, and it is far from 0.08mg/m³, the standard for average discharge in 8 hours in developed countries.
As it’s with every purification technique, ESP purifying technology has its benefits and drawbacks. As it saves the cost of frequent change of its filters, which only needs regular washing, it’s also a popular choice for many consumers.