Both Model 202 and Model 205 Ozone Monitors are linear over the range 1 ppb to 100,000 ppb (100 ppm); i.e., they are linear over 5 orders of magnitude.
Example Calibration Curves for Model 202 and 205 Ozone Monitors
Date: 26 July 2006
Author: John Birks
Background
As expected for the analytical method of UV absorbance, 2B Tech Ozone
Monitors are extremely linear with respect to ozone concentration. Both Model
202 and Model 205 Ozone Monitors are linear over the range 1 ppb to 100,000
ppb (100 ppm); i.e., they are linear over 5 orders of magnitude. The large
dynamic range compared to conventional ozone monitors is due to two factors:
1) the logarithm of the Beer-Lambert Law is calculated in the microprocessor and
not approximated by ∆I/I as is done in many ozone monitors, and 2) the
instrument has a much shorter absorption cell, which further extends the dynamic
range. For atmospheric purposes the Ozone Monitors are calibrated over the
range 0-300 ppb relative to a NIST-certified standard instrument, and the
calibration data are provided with the instrument. The following are example
calibration curves for the most recent Model 202 and Model 205 instruments sold
at the time of writing of this Technical Note.
Model 202 Ozone Monitor
Serial No. 393, Calibrated on 26 July 2006
Model 205 Ozone Monitor
Serial No. 389DB, Calibrated on 10 July 2006
