Why measure it?
In the upper atmosphere ‘good’ ozone (O3)
protects life on Earth from the sun’s ultraviolet rays.
level ‘bad’ ozone is a criteria pollutant that is a significant
health risk, especially for people with asthma.
It also damages
crops, trees and other vegetation and is a main component of smog.
Where does it come from?
Ground level ozone is not emitted directly;
it is created by chemical reactions between oxides of nitrogen (NOx)
and volatile organic compounds (VOC) in the presence of sunlight.
Emissions from industrial facilities and electric utilities, vehicle
exhaust, gasoline vapors, and chemical solvents are some of the
major sources of NOx and VOC.
How do we measure it?
The O3 detector module continuously measures ozone in ambient air.
detector module incorporates a gas sensitive
is a tungsten oxide (WO3) formulation that is particularly sensitive
to O3 when operated at elevated temperatures.
By subjecting the
sensor to periodic zero flow conditions and temperature cycling, the
detector module compensates for drift and cancels
interferences from NO2 and VOCs.
see Modbus network configuration.