Teledyne MODEL T703 Manual Do Utilizador

Ozone is a naturally occurring substance that is sometimes called "activated oxygen".  It contains three atoms of 
oxygen (O

3

) instead of the usual two found in normal oxygen (O

2

) that is essential for life.  Because of its 

relatively short half-life, ozone cannot be bottled and stored for later use and there fore must always be 
generated on-site by an ozone generator.  The two main principles of ozone generation are UV-light and corona 
discharge.  While the corona-discharge method is most common because of its ability to generate very high 
concentrations (up to 50%), it is inappropriate for calibration needs since the level of fine control over the O

3

 

concentration is poor.  Also, the corona discharge method produces a small amount of NO

2

 as a byproduct, 

which also may be undesirable in a calibration application 

The UV-light method is most feasible in calibration application where production of low, accurate concentrations 
of ozone desired.  This method mimics the radiation method that occurs naturally from the sun in the upper 
atmosphere producing the ozone layer.  An ultra-violet lamp inside the generator emits a precise wavelength of 
UV Light (185 nm).  Ambient air] is passed over an ultraviolet lamp, which splits some of the molecular oxygen 
(O

2

) in the gas into individual oxygen atoms which attach to other existing oxygen molecules (O

2

), forming ozone 

(O

3

).  

 

Reference 

Detector

 

U
V 

L
a
m
p

Flow 

Control 

Assembly

To 

Photometer, 
Cal Gas and 
Vent Outlets

 

Inlet from 

Diluent Source 

Valve 

07223B DCN6378