Teledyne 9110T instruction manual Ozone Generator Dry Air Supply, Ozone Generator Principle

Model 9110T NOx Analyzer Principles of Operation

the air stream to prevent reaction with the O3. As the capacitor charges and discharges, electrons are created and accelerated across the air gap and collide with the O2 molecules in the air stream splitting them into elemental oxygen.

Some of these oxygen atoms recombine with O2 to O3. The quantity of ozone produced is dependent on factors such as the voltage and frequency of the alternating current applied to the CD cells. When enough high-energy electrons are produced to ionize the O2 molecules, a light emitting, gaseous plasma is formed, which is commonly referred to as a corona, hence the name corona discharge generator.

Figure 13-10: Ozone Generator Principle

13.2.3.2. Ozone Generator Dry Air Supply

Ambient air usually contains enough water vapor to greatly diminishes the yield of ozone produced by the ozone generator. Water also reacts with chemicals inside the O3 Generator to produce caustic substances such as ammonium sulfate or highly corrosive nitric acid that will damage the optical filter located between the reaction cell and the PMT.

To prevent this, the air supply for the O3 generator is dried using a special Perma Pure® single tube permeation dryer. The dryer consists of a single tube of Nafion® that is mounted within an outer, flexible plastic tube. Nafion® is a co-polymer that absorbs water very well but not most other chemicals. As gas flows through the inner Nafion® tube, water vapor is absorbed into the membrane walls. The absorbed water is transported through the membrane wall and evaporated into the dry purge gas flowing through the outer tube, countercurrent to the gas in the inner tube.

Teledyne Analytical Instruments 333