Teledyne 460L User Manual

beam is only required to make pass through the Absorption Tube.  Therefore no complex mirror 

system is needed to lengthen the effective path by bouncing the beam back and forth. 

Finally, the UV then passes through a similar window at the other end of the Absorption Tube and 

is detected by a specially designed vacuum diode that only detects radiation at or very near a 
wavelength of 254nm.  The specificity of the detector is high enough that no extra optical filtering 

of the UV light is needed.   

The detector reacts to the UV light  and outputs a voltage that varies in direct relationship with 

the light’s intensity.  This voltage is digitized and sent to the instrument’s CPU to be used in 
computing the concentration of O

3

 in the absorption tube. 

 

 

In order to solve the Beer-Lambert equation it is necessary to know the intensity of the light 
passing through the absorption path both when O

3

 is present and when it is not.  The Model 460L 

accomplishes this by alternately passing the sample gas through a chemical scrubber that 
removes any O

3

 present and sending it directly to the absorption tube.  

                      

From Sample 

Port 

To Exhaust 

Port 

Valve switches 

every 3 seconds