User’s Guide ______________________________________________________________________
88 ___________________________________________________________________M211486EN-A
In the cathode chamber:
3 I
-
-> I
3
-
+
2 e
-
In the anode chamber:
I
2
+ 2 e
-
-> 2 I
-
These chemical reactions result in the following statement:
ONE O
3
MOLECULE CAUSES A CURRENT OF TWO
ELECTRONS
The current is measured with the OIF411 interface.
Calculation of Local Ozone Values
The partial pressure of the ozone is a measure for local ozone
concentration. Sometimes ppm
v
values are used. Basic principles for
this step of the calculations are given in the sensor manufacturer's
manuals. See
. As each molecule of ozone
creates a current of two electrons, ozone concentration is:
NOTE
The reaction occurs with all oxidants (such as NO
2
). The chemical
reaction in sensor chambers is affected by the sensor dimensions, air
bubbling rate, the total liquid volume of the sensor, and the
temperature of the sensor solution. These factors introduce some basic
errors and variance.
