WHy IT IS IMPOrTaNT TO MeaSUre OZONe
aT varIOUS POINTS IN THe rOOM
Ozone concentrations can vary greatly at various locations, and the concentrations are often highest in
unexpected places. Key points to consider:
• Ozone is much heavier than air and tends to sink to lower levels.
• Ozone has a low vapor pressure and so it does not try to fill the room uniformly. It tends to stay where
it is.
• Ozone tends to cling to rough surfaces such as fabrics and breaks down (converts back to oxygen) when
passing through restricted and obstructed passageways.
• Ozone reverts back to oxygen with a “half life” (time to go to half its original amount) typically of 10‑30
minutes.
• Ozone easily can be confused by instrumentation with other oxidizing gases such as chlorine compounds,
acid fumes, and nitric oxides (NOx). Strong “reducing” gases, such as vapors of alcohol and solvents,
can reduce the apparent concentration of ozone.
• Ozone has a sweet smell, but the odor threshold varies widely by the person and by ambiental conditions.
Therefore “smell” is not a reliable test for the presence or concentration of ozone.
OZONE MAPPINg
AROUND A SMALL OZONE gENERATOR
The important measurement is:
What is the ozone concentration at the breathing level where room occupants will be?
For ozone introduced via hVAC systems, with good room air circulation, the alternate point of measurement
is near the entrance to the return air duct.
More information about our products and applications at:
www.ecosensors.com
OZONE gENERATOR
OZONE FLOW MAY
NOT gO STRAIghT OUT
FROM ThE OZONE gENERATOR.
MAJOR CONCENTRATIONS MAY
BE IN SIDE LOBES.
OZONE "FLOWS" ALONg
TABLE TOP AND ThEN
"FALLS" TO ThE FLOOR
SOME OZONE
REVERTS BACK
TO OXYgEN
SOME OZONE
RETURNS TO ThE
OZONE gENERATOR AIR INLET
