Having reverse engineered the four-wire version of this ozone generating module, I decided to get the two wire version too, as the circuitry looked different.
Here's a link to the four-wire video:-
https://www.youtube.com/watch?v=GwHy-YfopL0
It turns out that these modules may be used in "chopstick sanitisers". Possibly along with a UVC lamp controlled by the safety relay in the four wire version.
The unit splits oxygen molecules in the air apart using a low power corona discharge created by applying a high voltage AC supply between the gas in the tube (purely used to couple it to the inner walls and provide a visual effect) and the loose mesh on the outside of the tube. The current capacitively couples creating the corona discharge.
Once the oxygen molecules have been separated into their two atoms they can combine with other oxygen/hydrogen atoms and create triple atom oxygen (O3/Ozone), Hydroxyl radicals (1 atom each of oxygen and hydrogen) and many other transient molecules. Because these molecules are short lived and want to get rid of the extra oxygen atom, or collect a hydrogen atom, they have a strong biological effect, killing bacteria and viruses quickly.
Ozone and hydroxyl radicals occur in nature and may be an essential part of natures air cleaning system.
Like most other things, like coffee and cake, ozone is harmful in large quantities, but safe at natural levels. The people who claim any level of ozone is harmful are generally taking an extreme and non scientific view.
I tested the unit on 110V and as predicted it didn't work. When I added another 470K resistor in parallel to the existing one on the thyristor's trigger circuit, it did work, but at a much lower output.
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